Senator Ed Markey Announces New Green Business Loan Programs at Resonant Solar Site

On July 22, 2024, our team had the privilege of welcoming Senator Ed Markey and Administrator Isabel Casillas Guzman of the US Small Business Administration (SBA) to one of our affordable housing solar projects in Dorchester.

The Indigo Block solar array

Indigo Block is a new construction development in Upham’s Corner, owned by Dorchester Bay Economic Development Corporation. The solar system, installed in August 2022, is offsetting 33% of the building’s common area usage which includes elevators, hallway lights, and community rooms. The housing development is expected to generate $420,000 in net financial benefit over the lifetime of the system.

The Senator and Administrator were announcing a new Green Lender Initiative to enroll additional climate lenders in SBA’s loan programs. The initiative will employ SBA loan guarantees to attract additional private capital in support of clean energy investments spurred by the Inflation Reduction Act.

Resonant Energy co-founder Isaac Baker spoke to Senator Markey's leadership in passing the Inflation Reduction Act that has enabled our rapid expansion of solar for affordable housing and nonprofits across MA and our enthusiasm for the forthcoming Greenhouse Gas Reduction Fund and SBA funding that will continue to increase uptake.

From left: Kimberly Lyle, CEO of Dorchester Bay Economic Development Corporation, City Councilor Brian Worrell (District 4), Isaac Baker, co-CEO of Resonant Energy, Rep. Christopher Worrell (Suffolk), and Senator Ed Markey

Isaac and Senator Markey joined by Resonant staff members Colby Lawless (Account Manager) and Joanna da-Cuhna-Semedo (Sr. Environmental Justice Program Manager)

Read more about the Senator’s Announcement

Senator Markey, Administrator Guzman Announce Biden-Harris Administration SBA Loan Programs to new green lenders to help small businesses meet climate goals - Senator Ed Markey’s Office

Markey touts new clean energy business initiatives in Boston - Boston 25 News

Resonant Energy’s Recommendation for the Future of Massachusetts Solar Incentives

By Ben Underwood and Rachel Gentile

The first iteration of the Solar Massachusetts Renewable Target (SMART) program is ramping down, and the Department of Energy Resources (DOER) is currently soliciting comments from industry stakeholders to inform the program’s successor. This is an excellent opportunity for DOER to address some of the shortcomings of SMART and its predecessor SREC, primarily the insufficient incentives for low-income solar which have failed to spur widespread adoption.

Of 478 MW of small (<25 kW AC) systems enrolled in the SMART Program to date, only 21 MW or 4.4% are Low-Income Solar Tariff Generation Units (LI STGU). For context, roughly 34% of households in the state have incomes below $50,000 and would likely qualify as Low-Income Customers under current SMART guidelines. The vast majority of program participants are owners of non-low-income systems. Because of the program’s “declining block” structure, whereby the value of incentives decrease as more participants enroll in the program, this has decreased the SMART value available to LI STGUs without proportionately benefitting low-income customers.

Ensuring equity in the clean energy transition is critical. Low-income neighborhoods have historically been the target of predatory energy suppliers and many of these residents already face a high energy burden. To ensure that more low-income residents can participate in the clean energy transition, Resonant Energy submitted the following recommendations to the DOER.

1. Resetting Compensation Rates

The compensation rate for Low-Income Solar Tariff Generation Units (LI STGUs) should be reset to a minimum of $0.40/kWh to provide a stable and effective incentive for low-income participation. This rate should be exempt from the program's declining block values to ensure long-term benefits and accessibility for these customers.

2. Enhancing Consumer Protection

To protect low-income consumers, we’re advocating for a guaranteed 10% annual bill savings for participants in third-party-owned systems. These savings should be guaranteed for the full contract term, typically 20 - 25 years. We believe these changes would make solar investments both safer and more appealing to low-income households.

3. Expanding Eligibility Definitions

We recommend that the DOER expands the definitions for LI STGUs and Low-Income Property Solar Tariff Generation Units (LIP STGUs) to more accurately reflect the diverse sources of affordable housing that exist across the Commonwealth: The definition of LI STGU should be expanded to include any small property that cannot host more than 25 kW of capacity so long as it meets the other qualification requirements of a LIP STGU. And the definition of LIP STGUs should be expanded to include any system with a rated capacity greater than 25 kW that provides all of its generation output in the form of electricity or bill credits to:

• low or moderate-income housing, as defined under M.G.L. c. 40B

• condominiums that are deed-restricted to provide low-income home ownership or rental opportunities

• homeless shelters

• a residential rental building that participates in a covered housing program as defined in section 41411(a) of the Violence Against Women Act of 1994 (34 U.S.C. 12491(a)(3)

• a housing assistance program administered by the Department of Agriculture under title V of the Housing Act of 1949

• a housing program administered by a Tribally designated housing entity as defined in section 4(22) of the Native American Housing Assistance and Self-Determination Act of 1996 (25 U.S.C. 4103(22)

• Other affordable housing programs as the DOER may see fit

Not only would these changes allow more types of affordable housing to be covered under the SMART successor program but it would also align the state definition of “low-income property” with the definitions used under the federal Inflation Reduction Act. This would help reduce complexity for low-income housing providers and help ensure that more low-income solar can be built in Massachusetts.

4. Streamlining the Allocation of Benefits with Electric Distribution Companies (EDCs)

We recommend requiring EDCs to share lists of meter numbers associated with low-income properties with owners of eligible low-income solar arrays. These low-income systems should further be enabled to allocate credits using meter numbers instead of utility account numbers, thereby reducing the administrative burden of updating those numbers when a tenant moves. If credits are allocated to a meter associated with a low-income restricted unit, the system owner only needs to assign the credits once.

Lastly, the DOER should allow LISTGUs to be sized according to the total usage of multifamily properties so long as they allocate a minimum benefit to each tenant, therefore eliminating the need for these systems to restrict their size to common area usage, and making the most of available roof space.

Implications and Impact

Implementing these recommendations has the potential to significantly impact low-income communities, reducing energy burdens and increasing participation in solar energy programs. This approach not only addresses immediate equity concerns but also contributes to Massachusetts' broader sustainability and climate goals. The movement towards equitable solar energy in Massachusetts is more than a policy shift; it's a commitment to justice, sustainability, and community empowerment. By prioritizing inclusivity and equity in solar energy access, the state can serve as a model for others, demonstrating that the transition to renewable energy can and should benefit everyone. We welcome input from you, our community, on how our recommendations could be improved. And we would love your help if you would like to join us in advocating for the speedy adoption of these improvements. Together, we can light the way to a brighter, more sustainable future for all Massachusetts residents.

Suggestions or feedback can be sent to info@resonant.energy

Inflation Reduction Act: End of Summer Policy Update

NOTE: Since the original publication of this blog, the IRS has announced that the application for the Bonus Low-Income Tax Credits will open on October 19, 2023. Learn more here

As the IRS has released the final guidelines for the various tax credits under the Inflation Reduction Act, our team has been diving deep into the policy. Below is a high-level update on the most relevant policies for low-income solar and affordable housing. If you’re just wading into the ocean that is the IRA, we’d suggest checking out our previous explainers on the IRA for Nonprofits and our June 2023 IRA update. This blog post will clarify some of the new information that has come out since our last update.

Support from Resonant Energy

We cannot cover every policy detail in this blog post and there is much more to unpack. Existing clients can reach out to their business development representative for more specific questions about your project. We will also provide clients with a more detailed breakdown of all of the relevant policies.

Resonant Energy will work with all of our clients to ensure they have a pathway to access the highest possible federal tax credit incentives to support their projects. We will outline where applications have a greater or lesser chance of approval, estimated timelines for next steps, and financial implications for how the project can be financed under different scenarios. Once the Treasury makes the portal available, Resonant Energy will work to either submit applications on clients' behalf or to prepare all submission documentation for clients to submit directly if that is required.

Total Potential Tax Credit Value:

Between all of the applicable tax credits, solar projects will be eligible for up to a 70% Investment Tax Credit or Direct Payment. However, unless the project is an affordable multifamily housing project, built with domestically manufactured components and located near a decommissioned coal power plant, or another equally specific scenario, it will likely qualify for a lower tax credit. We expect most projects to fall into the 30-50% range.

Guaranteed Adders (No Application Required)

Energy Community (10%)

The Energy Communities Adder automatically adds 10% to the tax credit if a project is located in one of the following:

• Brownfield Site (note: must have contamination not solely from petroleum).

• Census tracts near current/former coal-fired power plants

• Census tracts with a high rate of employment in the energy sector and high rates of unemployment (e.g. all of West VA).

You can determine if a particular census tract qualifies for the Energy Community Adder here. Resonant Energy is creating our own EJ Map that will incorporate both the Energy Community Adder and the Low-Income Bonus Tax Credit — stay tuned!

Domestic Content (10%)

We have some clarification on what is required to qualify for the domestic content adder. First, any steel and iron used in the racking for the project must be made in the US. Additionally, the total domestic content percentage must meet the increasing scale of minimum domestic content requirements (below), starting at 40% in 2023 and rising to 55% by 2027. The total domestic content percentage can be calculated by dividing the cost of domestically manufactured products and components used in a project by the total cost of materials (both domestically and internationally manufactured). The cost of US-manufactured steel and iron can be included in this calculation, which, given the price of steel, makes most canopy projects eligible for this adder.

Bonus Low-income Tax Credits (Application Required)

The Low-income bonus tax credits can be combined with both the domestic content and Energy Community Adders but a project can only apply for one of the LI tax credits. Below is a summary table of the different low-income bonus tax credits. If you’re looking for a more in-depth overview of these tax credits, check out our previous IRA Update.

Additional Selection Criteria

In order to determine which projects win bonus tax credits, the Treasury has proposed new Additional Selection Criteria. Facilities that meet these criteria get priority in the tax credit allocation process. At least 50% of the capacity for each bonus tax credit category will be reserved for projects that meet one or both additional selection criteria, meaning that projects that meet the criteria will have a greater chance of receiving the higher tax credit.

The Additional Selection Criteria are bifurcated into ownership and geographic categories. Facilities that fulfill at least one requirement in each category will be given the highest priority; facilities that meet a requirement in one category (say, ownership but not geographic) will be prioritized above those that meet none of the requirements.

The ownership category includes structures such as Tribal Enterprises, Alaska Native Corporations, Renewable Energy Cooperatives, Qualified Renewable Energy Companies, and Tax-Exempt Entities. On the geographic front, the facility should be located either in a Persistent Poverty County (PPC) or in a census tract designated as disadvantaged based on specific percentile parameters for energy burden and low income which can be identified using this screening tool.

Application Timing

The application for bonus low-income tax credits will be open for a 30-day window beginning on October 19, 2023. There will be no first-come first-serve element to that window. Projects with one or two Additional Selection Criteria will receive priority and all other projects will be put into a lottery if oversubscribed.

For any categories that are not fully subscribed after the initial window, applications will continue to be reviewed on a rolling basis.

Conclusion

We’re excited to finally see the details of the IRA coming together. While we are still waiting on the exact timing from the Treasury on when the applications will open, we are excited to get to be able to provide clients and partners with the tools and resources they will need to make the most of this opportunity. The IRA is landmark legislation that is fundamentally changing the way low-income and environmental justice solar projects will be built in the US and we are eager to get started.

Existing Resonant clients can contact their business development representative for further guidance. If you’re ready to explore solar for your portfolio or have questions about these policies, reach out to us at info@resonant.energy and someone will reach out.

Profit with Purpose: Why Resonant Became a B-Corp

What is a B Corp?

Resonant is proud to be a Certified B Corp. B Corps, or Benefit Corporations, are for-profit businesses that prioritize both profit-making and positive social and environmental impacts. They undergo a rigorous certification process conducted by B Lab, a non-profit organization. B Lab assesses a company's performance in areas such as governance, employee treatment, community engagement, and environmental practices. B Corps aim to generate financial returns while considering the well-being of employees, communities, and the planet, making them impactful players in the business world.

To certify, Resonant shared company financials and submitted an extensive survey for each of the four B Corp performance areas (governance, employee treatment, community engagement, and environmental practices). Resonant also made explicit commitments to prioritize our mission. We have enshrined our commitment to prioritize people and planet alongside financial goals in our operating agreement/company bylaws.

Why is Resonant a B Corp?

Since our founding in 2016, social justice has been at the center of our work broadening access to solar energy and becoming B Corp-certified felt like a natural extension of that mission. Additionally, at its inception Resonant Energy chose to incorporate as a for-profit social enterprise rather than a 501c3 nonprofit so we could message that our work would seek to be self-sustaining rather than reliant on grants and contributions; having opportunities to demonstrate the ways in which the company is different from most other for-profit companies and committed to staying that way long term was another key factor driving the company’s choice to get certified.

We also learned that some master's degree programs like the Yale MBA offer a financial break on student loan payments to help incentivize its graduates to work for nonprofits, the public sector or B Corp-certified organizations. We hope this trend catches on more broadly!

Solar energy will not become more equitable without careful and intentional decision-making. Equity-focused projects are not always going to be the most profitable or the easiest projects to build; many nonprofit projects face hurdles like older building stock, challenges with financing, or insufficient technical assistance. We believe it is important to prioritize social and environmental impact just as much as profit to ensure that these types of projects are built. As a B corp, we are required to remain transparent about our business practices and regularly check in on our performance which helps keep us accountable to our mission.

What’s the value to the client?

Nearly all of our clients are mission-driven organizations and we consider our clients' missions an extension of our own. We want to help nonprofits reduce operating costs so they can devote more of their energy and resources to serving their communities. You don’t have to trust that we value environmental and social benefit as highly as profit – it’s all laid out in our B Corp Report Card.

Inflation Reduction Act Update: How to Qualify for Bonus Low-Income Solar Tax Credits

In the 10 months since President Biden signed the Inflation Reduction Act (IRA) into law, we’ve received many questions from clients and industry partners about how these new regulations will be implemented. On June 1, the Treasury issued its proposed rules on Low-Income (LI) tax credits, opening a new chapter in equitable solar energy distribution. These changes emphasize the critical intersection of affordable housing and solar power, tying them together with groundbreaking new tax credit incentives.

This post will be focused on the emerging rules for how to qualify for bonus LI tax credits under the IRA. Note that this post details proposed rules, which are open for public comment here until June 30. We expect the Treasury to publish final rules in the months to come. (In case you’d like to learn more about the IRA’s impact on nonprofits, check out our blog post from last fall.)

Environmental Justice Location Adder (10%)

The Treasury is describing projects located in a low-income community as Category 1 and projects located on Indian land as Category 2, both of which will be eligible for a 10% tax credit adder. The Treasury has set a 700 megawatt (MW) capacity limit for Category 1 projects, 560 MW of which will be reserved for single- and multi-family residential behind-the-meter (BTM) facilities under the proposed rules.

Low-income communities are defined as a census tract with a poverty rate of at least 20% or a census tract with an area median income (AMI) that does not exceed 80% of the state’s median income. In metropolitan areas, a census tract can also be considered a low-income community if its AMI does not exceed 80% of that metropolitan area’s AMI. You can check if an area qualifies for this adder using this map.

Financial Benefit to Tenants Adder (20%)

The Treasury has placed emphasis on delivering a "financial benefit" to tenants of affordable housing which will make systems eligible for an incremental 20% tax credit. This lies within the framework of the proposed rules under Category 3, which includes a 200 MW allocation. Broadly, at least 50% of the financial value of net energy savings needs to be equitably passed on to the tenants; the beneficiaries of these savings must be identified as low-income under an existing housing program.

The rules use distinct criteria for calculating the financial value of net energy savings for Direct Purchase (DP) and Third Party Ownership (TPO) projects:

Table 1: Net Energy Savings Calculation

Low-Income Community Solar Adder (20%)

Another exciting provision is the 20% bonus tax credit for "low-income benefit" projects. This falls under Category 4, with a 700 MW allocation and is tailored towards Low Income Community Solar Subscription (LICSS) projects.

To qualify:

• At least 50% of the total output must be allocated to qualifying customers, defined as households with income below 200% of the poverty line or below 80% of area gross median income.

• Subscriber savings must be equal to or greater than 20% of the value of the underlying Net Energy Metering (NEM) credit (e.g., Net Metering Credit (NMC), Alternative On-Bill Credit (AOBC), etc.)

Application Timing and Selection Process

To be eligible for any of the bonus tax credits, a solar system cannot be operational before the award of the credit. In order to determine which projects win bonus tax credits, the Treasury has proposed new Additional Selection Criteria. Facilities that meet these criteria get priority in the tax credit allocation process.

The Additional Selection Criteria are bifurcated into ownership and geographic categories. Facilities that fulfill at least one requirement in each category will be given the highest priority; facilities that meet a requirement in one category (say, ownership but not geographic) will be prioritized above those that meet none of the requirements.

The ownership category includes structures such as Tribal Enterprises, Alaska Native Corporations, Renewable Energy Cooperatives, Qualified Renewable Energy Companies, and Tax-Exempt Entities. On the geographic front, the facility should be located either in a Persistent Poverty County (PPC) or in a census tract designated as disadvantaged based on specific percentile parameters for energy burden and low income which can be identified using this screening tool. 

Documentation for Bonus TC Allocation Application

The rules governing what documentation is needed to apply for the bonus tax credit allocation application are relatively complex (see table here for more details). For BTM facilities with <1 MW AC, here's a brief rundown of what’s needed:

• A completed site visit

• An executed DP contract or PPA contract

• Building and electrical permits

• Facility not designed to produce more than 110% of the historical customer load

Closing Thoughts

Equitable solar development is a pivotal part of the transition to renewable energy, and the proposed Treasury rules offer a glimpse into how the solar industry will change in the months and years to come. Understanding these rules helps us realize the immense potential of the IRA to bring about a fair and equitable energy future. 

We are still waiting for guidance from the Treasury regarding other policies including the Direct Pay provision for nonprofit organizations. We will continue to work with our partners and policy experts to remain at the forefront of these new regulations and we look forward to updating you as more information becomes available.

For now, put your hand up and make your voice heard during the open comment period for the Environmental Justice provisions which runs through June 30. Together, let's continue to illuminate the path toward a more just and equitable energy system.

How the Inflation Reduction Act is Changing the Way Nonprofits go Solar

Note: This article has been updated to reflect our evolving understanding of this legislation

By Rachel Gentile

The Inflation Reduction Act (IRA) is the single largest climate investment that the US government has ever made. Signed into law in August 2022, the legislation includes $369 billion in funding for climate solutions and environmental justice initiatives, with the ultimate goal of reducing carbon emissions by 40% by 2030. A portion of this funding is going to support improved solar incentives that are dramatically changing the way nonprofit organizations can pursue solar. 

Why is this important?

After Congress failed to pass the Build Back Better Act at the end of 2021, a sense of uneasiness spread throughout the solar industry (and throughout the environmental movement). In order for the US to meet our climate goals set by President Biden, we are going to need sweeping clean energy legislation and the failure of Build Back Better felt like a crushing blow to many who were eagerly awaiting these policy updates. When the Inflation Reduction Act passed with long-term tax benefits for solar installations and significant boosts for projects serving environmental justice communities, there was plenty to celebrate.

Below, we will break down how some of these new policies are helping make solar more accessible for churches, community centers, affordable housing providers, and other nonprofit organizations serving their communities.

What is in the IRA?

Federal Investment Tax Credit Increase

The most straightforward provision in the IRA is a substantial increase in the federal Investment Tax Credit (ITC). When a homeowner or business invests in solar, they can claim the ITC on their taxes and receive a direct tax credit. Under the previous legislation, the ITC was valued at 26% of the total cost of the installed solar project and was set to step down to 22% at the end of 2022 (and 10% thereafter). The IRA is improving the tax credit dramatically by bumping the ITC up to 30% for the next 10 years. This increase is also retroactive for the 2022 year - any project that was built in 2022 and is now eligible for a 30% tax credit.

A higher ITC not only benefits nonprofits that own their solar array but also those choosing to install third-party-owned systems. Power Purchase Agreements (PPAs) are a great option for organizations that have capital constraints because they require no upfront cost, and the nonprofit organization is not responsible for any maintenance. With the additional revenue from a higher tax credit, Resonant is working with financers to offer more favorable PPA rates to both new and existing clients. 

The ITC covers the entire upfront cost of your system, including all equipment and installation costs, meaning it effectively reduces the price of your project by 30%. Installing solar can sometimes require upgrades to utility infrastructure such as a new transformer. Previously, the cost of infrastructure upgrades could not be covered by the ITC, but now these upgrades can be included in the total project cost.

Direct Pay for Nonprofits and Other Tax-Exempt Entities

The most groundbreaking policy change for nonprofits is the addition of a Direct Pay provision. Previously, nonprofits and other tax-exempt entities could not take advantage of the tax credit, making owning your own solar array significantly less economical for nonprofits than for tax-eligible entities. These organizations could work with third-party financers to set up a PPA or a hybrid ownership option but both of these solutions saw lower lifetime savings than an ownership option.

Under the new Direct Pay provision, solar customers will be able to receive a cash reimbursement for the full value of the investment tax credit. The Treasury has not released an application or process for Direct Pay, but nonprofits that work with Resonant will have step-by-step assistance as we navigate this process together.

Environmental Justice Adders

In addition to increasing the base value of the ITC, the IRA has also implemented 3 environmental justice-focused incentive adders that can make a project eligible for up to a 50% tax credit. These benefits are designed to help address some of the barriers to equitable access for low-income residents and limited-resource communities. The details have yet to be finalized by the Treasury but we know that the total capacity for these benefits will be limited to 1.8 GW each year. We encourage organizations to contact us at your earliest convenience to see which incentives you qualify for. 

Environmental Justice Location Adder (10%)

A project becomes eligible for an additional 10% tax credit if the project itself is located in a low-income census tract.

Affordable Multifamily Tenant Benefit Adder (20%)

A project that is located on a low-income residential building that is evenly distributing the electricity savings among tenants becomes eligible for an additional 20% tax credit. We are still waiting for more information on how this one will look and what the requirements will be

Low-Income Community Solar (20%)

Any project that is sending at least 50% of the output from its system to low-income households becomes eligible for an additional 20% tax credit. This is a great option for organizations with large roofs or parking lots but relatively low energy usage such as houses of worship.

The Treasury has until February 12, 2023, to finalize the guidelines and application process for these environmental justice adders. We expect that the application will require a signed contract and interconnection agreement with the utility company.

What’s Next?

The IRA is a complex piece of legislation with significant implications for solar across market segments. If you’re interested in a deeper dive into the details of this legislation, you can check out this recording from our webinar Solar for Nonprofits: New Policies, Big Benefits.

Organizations that are interested in taking advantage of these additional benefits but haven’t begun the pre-development process should reach out to info@resonant.energy with a copy of their electric bill. This will allow Resonant to get started with initial designs and contracting so that your project can be ready to apply for these exciting new benefits when the portal opens in 2023. We expect these programs will fill up fast so we want our clients to be the first in line.

For the first time, nonprofit organizations are fully empowered to take control of their own clean energy future. Though there is still some uncertainty about how all of these policies will be implemented, our team is feeling energized by the forward momentum in the clean energy industry. We are excited to continue working with nonprofits to find the ideal solar solution that best fits your financial needs while supporting your organization’s mission.

Resonant Energy’s “Solar Ready” Definition for New Construction

By Katherine Wagner

Resonant’s recent work with a number of affordable housing developers has made one fact increasingly apparent: early coordination is key for the successful implementation of solar energy in new construction. The term “Solar Ready” has been used in the past to communicate to builders and developers that solar design has been factored into building plans; however, the definition of the term can vary widely. In this blog post, we will dive into what solar ready really means, when to start planning for solar, and who needs to be involved as we continue our work to provide solar access and energy savings to our community.

KEY PLAYERS

At the start of a new construction project, there are many individual contributors to the final design. From the very beginning of a solar project, developers, general contractors, architects, engineers, electricians, plumbers, HVAC, and roofers are all involved in decisions made to make a project “solar ready.”

To help ensure that the building effectively includes solar design parameters, we suggest property developers consult Resonant once construction drawings are 50% complete. At this point in the process, we can address questions like, “What roof material is preferred,” “Where do I need to locate vents and HVAC to best reserve space for solar panels,” etc. 

GETTING STARTED: DESIGN PHASES I & II

After a letter of intent has been signed and we receive 70%-100% complete construction drawings, Resonant will begin Design Phase I. Together we will review the construction drawings to identify the following items and recommend any necessary modifications to the construction drawing sets to incorporate solar design:

1. Structural:

   1. Additional dead load bearing capacity of the roof in lbs/sqft (PSF). Note: for sloped roofs, we recommend min 5 PSF; for flat we recommend min 10 PSF

2. Electrical: 

   1. Behind the House Meter: The most common tie-in strategy for solar PV is to have a dedicated breaker (typically 150-200 amps for most multifamily projects) added to the house panel for us to back-feed. This is ideal based on the incentives in MA and also comes with the benefit of allowing us to complete our tie-in without shutting down power to the whole building for 8-12 hours.

   2. Standalone Meter: it is possible to set up solar PV via a standalone meter and export the value of the electricity produced to other sites. This is much less common and requires robust advanced coordination to ensure the tie-in pathway is well planned for with the electrical engineer for the development.

3. Conduit: 

   1. Architects should include a 4” metal internal conduit from the roof to the electric room with as straight a shot as possible to be dedicated for solar PV as part of the GC scope. 

4. Plumbing:

   1. Vent Pipes - often can be moved. should be grouped in the middle of the flat roof or located as close as possible to the roof’s edge – or near other obstacles.

   2. Roof Drains - generally can’t be relocated, but good to be mindful about placement to the extent possible as it will remove space where panels can be placed.

5. HVAC:

   1. Equipment Placement: typically center spine of flat roofs and sited ground/attic for sloped roof sites. Most can’t be moved; however, choosing centralized VRF systems in lieu of single heat pumps for every unit can A) centralize load for solar to offset on the common meter and B) significantly reduce the amount of roof space needed for HVAC - leaving more space for solar.

   2. Walkway Pads - typically can’t be moved, but are an obstacle for solar PV. Often not included in building drawings, so helpful to include if possible.

   3. Gas Lines - can significantly disrupt solar and sometimes are not placed carefully. Be sure to highlight for the GC and subs to ensure no issues arise.

   4. All other obstructions that would affect solar equipment placement

6. Roof Information:

   1. Flat Roof Material Type: EPDM is the easiest to install solar on (can be procured in white if needed, though is most commonly black). White TPO is the most common material we’re seeing developers use due to its slightly lower cost, however, it can be challenging to install solar on this material due to the significant additional costs associated with waterproofing penetrations through the material compared to EPDM. 

   2. Sloped Roof Material Type: Asphalt is the most common material for sloped roofs.  

   3. Roof Material Manufacturer & Warranty: we need this information from the development team as soon as a vendor has been selected so we can proceed with the paperwork in advance of our installation to ensure that we preserve the roof warranty. 

   4. Additional Info: Roof slopes / tapered insulation depths are useful to know in determining the best racking type for the array. If not included in the designs, we will follow up. Greater slopes often mean that a fully ballasted racking design won’t work and we’ll have to have some penetrations.

7. Fall Protection: 

   1. Parapets & Rails: > 39” tall parapets and guardrails cover fall protection for ongoing solar maintenance needs; however, these are more expensive solutions and not frequently used, unless a parapet is required for other aspects of the building’s design.

   2. Tiebacks: These are the most common type of fall protection used for solar and other fall protection needs due to their significantly lower cost. These should be placed either towards the center of the building or towards the outer edge (within 4’) to avoid impacting the space for solar PV. Note: you’ll always need one near the center of the roof where you enter so you can get to others on the roof safely.

8. Other: 

   1. Any other equipment that extends above the roof surface (e.g. antennas) or areas of the roof over which solar panels should not be installed (e.g. roof hatches) can pose a challenge as they are not always included in the full construction drawing set. In the past, we have seen this kind of equipment get installed without consulting solar and has resulted in losing modules. 

Design Phase I 

This first phase will yield a stamped preliminary electrical permit plan set which will allow us to apply for interconnection with the utility. After completing the Preliminary Solar Engineering Design, we will share the .dwg CAD files of the solar equipment placement. The solar equipment must be added to the architect’s building drawings so all parties are clear about where solar will be installed. Failure to capture all of these items in the initial design significantly increases the likelihood of future change orders and added costs.

Design Phase II 

The second phase begins once the roof of the building has been completed and we can schedule a site visit with the solar installer. This site visit will identify what, if anything, has changed from our initial design plan to the as-built conditions and locations of roof obstructions. Based on past experience, changes from our preliminary plan set for interconnection and the final building design occur most commonly on flat roofs. New obstructions can often result in a solar design that is 5-10% smaller than earlier designs. Please see figure 1 for an example of changes made to a solar project due to new roof obstructions in the construction process. Reductions in system size beyond 5% will result in a change to the $/watt cost of the system (or, for systems financed through a no-cost Power Purchase Agreement (PPA), a change to the PPA year-one discount and/or PPA annual rate escalator). 

With sloped roofs, final designs often closely match the preliminaries. To prevent reductions in array size, the Customer must hold their GCs accountable through planning and expectation setting to defend the roof space for solar and ensure the building is fully solar ready by the time we enter Design Phase II. 

Figure 1. This is a photo of a new construction affordable housing solar project during Design Phase I and Design Phase II. As you can see, after the building was constructed and we performed a site visit, there were vent pipes placed in areas that conflicted with the solar array design from Design Phase I. This resulted in the loss of panels and a reduction in system size. Incorporating the solar design from Design Phase I into construction drawing sets is highly recommended to defend the roof space for solar and ensure all parties involved have the same design information. 

SOLAR EQUIPMENT PLANNING/STAGING

While it is clear that building components and obstructions are an integral part of solar design planning, it is also important to plan accordingly for the solar equipment itself. Below is a list of equipment that will be added to the building as a result of installation:

• Inverters: Can go on a roof penthouse (min 2.5’ off the ground), internally, or externally at ground level. Note: should be in a relatively shaded spot to avoid overheating and loss of productivity in the summer.

• Conduit: If GC doesn’t have 4” metal conduit in their scope to get solar from the roof to the electric room, we will need to run an external conduit as part of our scope, which developers don’t typically like as much aesthetically. Note: if the electric room is not adjacent to the exterior of the building, the GC also needs to install 2x 2.5” metal conduits to allow us to get from the electric room to the exterior to locate a required disconnect switch for first responders.

• SMART Meter and Disconnect Interior Placement: If the building has an underground service drop and the meter bank is interior, the utility will typically require “meter grouping” with the SMART meter inside and two disconnects (one outside and one inside)

• SMART Meter and Disconnect Exterior Placement: If the building has an overhead drop and external meters, then the disconnect and SMART meter must be outside, near the meter bank (typically outside the electric room) 

ROOF READINESS: STRUCTURAL PLANNING AND RACKING SOLUTIONS

Structural planning happens very early in the building process. Across all flat roof projects, an additional 10lbs/sf of dead load capacity should be added to the structural load for solar equipment. For sloped roofs, we recommend at least 5lbs/sf of dead load capacity. When included in the early phases of design, adding dead load capacity for solar will allocate the correct structural preparedness and will save both time and resources needed to reinforce the structural capacity of a roof later in the construction process. 

Figure 2. Racking types and structural lbs/sf recommendations

Racking determines how many modules we will be able to fit on a given roof. Depending on the needs of the project, we will recommend different racking types. For flat roofs, we prefer fully ballasted racking. We have seen white TPO become a standard roofing material for new construction buildings and while TPO may check boxes for certain insulation and building standards, it can pose a challenge for solar installations. The most important component of installing solar on a flat TPO roof is to avoid the need for mechanical attachments to prevent drilling into the insulation and maintaining the integrity of the material. 

For projects that require high energy density – for example, City of Boston E+ developments – wavelet racking is a premium option that allows more modules to be installed on the roof. This is the heaviest method for racking due to the concentration of modules and the ballast blocks included in the design. It is recommended to add 15lbs/sf of dead load capacity to the structural calculations. 

We are excited and encouraged by the engagement to better define what it means for a new construction affordable housing project to be “solar ready.” Sharing our learnings and recommendations can only lead to better, more optimal solar installations in the future. 

New Construction: Estimating Electricity Usage & Why It Matters

By Isaac Baker

As we move to electrify our society and introduce onsite clean energy generation to create greener, more efficient buildings, one of the key places where evolution is needed is for development teams (including developers, architects, consultants, etc.) to have a clearer understanding of how the design choices they make will impact ongoing energy consumption. This will be the first post in a new series on new construction which will examine how development teams are making design choices that impact energy consumption and in turn, create tradeoffs for how solar PV can be introduced to offset that consumption. Because Resonant Energy focuses on affordable multifamily housing, this series will focus specifically on some of the nuances of multifamily – but it’s worth noting that many of these learnings are broadly applicable to all new construction.

Early Design Considerations

When it comes to optimizing energy usage on new multifamily buildings, there are two key factors for developers to consider. Since the value of electricity is reduced if it is spread across multiple meters, the highest priority is to have as much electricity load behind a single utility meter as possible. The second-best scenario is to have as much property owner-paid load as possible across meters (as opposed to tenant-paid load). This is all part of addressing the infamous “split incentive” issue between landlords and tenants in multifamily rental housing, where property owners invest in energy efficiency improvements, but only the tenants benefit. To address this issue and design a building where solar PV will integrate most effectively, there are three choices that developers make early on that have an outsized impact on how solar PV can be used at the site: 

1. Electric Utility Metering - Will it be Master Metered or Will there be Individual Tenant Meters?

   In our experience, nearly all of the buildings we work with will have individual tenant meters. While it is technically possible to have a master meter with submeters for individual units (which you might see for a senior housing facility where tenants are not expected to be responsible for the bills), the building can be more flexibly used over time if it has individual meters from the start – regardless of the intention regarding who will pay the bills directly (see below). If a building does have the statutory ability to be master metered in the state and utility framework that a building will operate in, this will be the best outcome from a solar integration standpoint. If not, as is often the case, items #2 and #3 offer alternate solutions.

2. If Separating out Tenant Load - Can Load be Moved to the House Meter?

   The key load in question is heating and cooling, which typically represents the largest form of energy usage for a building. Opting for a central electric VRF system tied to the house meter instead of using gas or individual air source heat pumps for each unit is the clearest way to eliminate the split incentive issue and ensure that you have enough centralized electricity load for solar to offset on a single meter. This comes with the other benefit of lowering the number of compressors on the roof that solar has to be designed around, which in turn increases the capacity of the roof.

3. Regardless of Metering - Who Pays the Bills?

   Some of the more forward-thinking developers we work with are addressing the split incentive issue by still having individual tenant meters – for statutory or long-term strategic purposes – but then paying for those bills and rolling electricity costs into the rent. While this is not quite as ideal as centralizing load behind a single meter – many states will allow for cost-effective crediting from the house meter to other meters paid by the same entity on-site, meaning there is a cost-effective strategy available for exporting value produced on the house meter to other meters on site. 

For building types with limited common area spaces and load (e.g. triple-deckers or townhouses), this strategy is vital for having a pathway forward for solar with a decent return on investment (ROI). Note: Developers almost never in our experience change the strategy for how this works once the building is operational due to the difficulty of updating all of the agreements with tenants, so this strategy needs to be adopted out of the gate. 

Calculating a Building’s Estimated Usage

Once you’ve solved these strategic questions regarding the setup of the building’s energy systems, the next question that you need to solve is: how much energy will the building actually use in a given year? Independent of solar, this is an important step that all developers should be taking as many pieces of equipment that are more efficient come with a higher upfront cost. If developers don’t take the time to understand the picture for the operational savings, they will continue to buy the lower upfront cost pieces of equipment and plug-in guesses for energy usage for the building based on the number of units. An example of this upfront investment can be seen in the recent trend in police departments switching to Tesla cars based on operational savings). More sophistication is needed here for the industry and for underwriters to help us modernize our approach. To address this, Resonant Energy has developed a worksheet template. The inputs you’ll need are as follows: 

• Loads: A list of all of the loads for a given meter that the developer will pay for and their associate kVa or kW rating. This is typically generated by the electrical subcontractor who prepares the load sheets with this data for the new service application process with the utility that will ultimately size the service to the building. As an aside, service is usually sized to deliver the maximum instantaneous load that the building could theoretically draw if all systems were running full blast. 

• Estimated Runtime as a % of the Year: This is the most challenging piece of the puzzle. In order to get from the rated capacity of the equipment to the quantity of power it will use, you need to know the runtime in hours per year. We generally come to this number through common sense math – interior lighting is on almost all of the time, exterior lighting closer to half the time, heating and cooling based on the local climate, etc. – but a more intensive process could be used to review studies of operational data for the relevant pieces of equipment. 

  • Note: Runtime has been particularly challenging to estimate for clients who are installing new EV charging stations for multifamily housing because it’s entirely unclear to what extent the chargers will be used, which can be influenced by many factors – including if the charger is publicly available, behind a paywall, etc.

• Load Factor: You also need to derate the total rated capacity of the equipment because it’s unlikely that the equipment will be running at its maximum capacity most of the time (if ever). We use somewhere in the 60-70% range, but it should be noted again that this is a guess at an average across all of the equipment and could have a more rigorous process applied as well by studying normative draw for each individual load type. 

Note: Our team will complete this calculation for you for projects we’re assessing – so if you’re overwhelmed, or simply whelmed, no need to worry!

Typical Usage Profiles by Building Type

After two years of data collection from this usage modeling, we have created a summary of the three typical types of buildings that we’re seeing in terms of common area load:

*In all of the cases above, we are assuming a 40-70 unit building, which is typical of what we see being developed in MA given current sizing strategies regarding the low-income housing tax credit (LIHTC) and other funding targets. Solar sizing can change dramatically based on how well roof space is defended and allocated for it, so that is a guess.

How Can Solar Systems Benefit Tenants or Others in the Community? 

In most cases, onsite solar can only produce enough power to cover common area loads and that is by far the easiest thing to do contractually and logistically. However, under the current policy in MA, we do have a few pathways to direct value directly to tenant-paid bills in the event a site can produce more than the onsite, owner-paid usage (which based on policy is the highest financial value pathway for the property).

• Townhouses & Triple Deckers (< 25 AC): For smaller projects like this, Resonant Energy has successfully advocated for a policy pathway that allows us to tie the project into the house meter with very nominal usage for these types of buildings. From there, we request that the utility direct the majority of the rest of the excess each month to other owner-paid bills in the development. Developers also have the option to give away 15% of the output to qualifying low-income residential bills (R-2 rate class, or R-1 rate class in an income-qualifying state EJ Census Tract) via our Solar Equity Platform, making the entire project eligible for increased SMART incentives. Resonant is open to collaborating with housing developers to distribute these benefits to tenants, or we can handle it separately and direct the benefit to others in the community. You can learn more about this new, award-winning program here.

• Larger Scale Community Solar (> 25  AC): Additionally, larger projects can be set up on a standalone meter and operated as a community solar project. This we most often pursue where onsite production dramatically exceeds onsite usage (this is especially the case for sites with good parking canopy potential, e.g. > 80 unshaded parking spaces). In this setup, we can direct the utility to send up to 50% of the output to a central meter and then the remaining must be sent to accounts in < 25 AC allocations (approximately 41,000 kWh/yr). This is standard community solar and can work with any type of offtaker – e.g. a small business, a church, etc. 

  Low-income community solar comes with a higher incentive under the SMART program and requires that the remaining 50% of the power be allocated only to qualifying low-income bills (as defined in the section above). In this case, the experience for the offtaker is more similar to standard community solar because the community solar credits must be sold to them. For example, a participant might receive $100 as a credit on a bill in a given month. If they sign a contract for a 20% discount, they will then receive a separate invoice for $80 from the owner of the solar array. Their net benefit for the month will be the $20 gap. Because of the billing complexity, this process can be more difficult and may not be the preferred route for many housing developers – noting that they would not need to be involved directly in the billing workflow.

It’s worth noting that any time a tenant moves, that will typically trigger the need to find a replacement, have them sign a participation agreement, and provide their new account information. This is applicable for any of the options noted above in MA and it’s important to discuss upfront how responsibility for this workflow will fall over the life of a solar system.

Under current policy in NY, there is a move towards consolidated billing for community solar wherein the utility can facilitate the bill credits & energy savings showing up on tenants' bills without adding the separate billing process, which is currently required in MA. This is a fairly recent policy development as of 2022, so more details to come!

Designing a new building to be solar-ready may seem like a complicated process but the lifetime energy savings will make the upfront work well worth the effort. You can learn more about solar options for new construction here and if you’re ready to discuss solar for your project, please fill out our new construction interest form.

Resonant Energy 2022 Massachusetts Climate Bill Summary

May 5, 2022 - Update on lawmaker negotiations

By Leonard Schloer and Isaac Baker

On April 14, 2022, the Massachusetts state senate passed an extensive revision and expansion to last year’s sweeping Climate Bill. This year’s bill, the “Act Driving Climate Policy Forward,” is likely to go through changes as it is reviewed by the house (full language available here). It is up to us as stakeholders in clean energy and environmental justice to advocate for this bill and ensure it stays intact in the few months before it is voted on by the House.

While this year’s bill is not quite as extensive as last year’s, there is still a lot to unpack, especially for small-scale solar. Before we dive deep into all the relevant proposed legislation, here is the high-level synopsis of the three most significant issues for Resonant that will impact our work with affordable housing, nonprofits, and low-income households across MA:

Outlawing Predatory 3rd Party Electricity Contracts 

$426 million has been taken from mostly low-income households through ballooning electricity contracts negotiated between predatory energy suppliers and residential customers. These contracts have fabricated an undue burden on families and (understandably) fostered public distrust in energy providers within low-income communities and communities of color. These predatory organizations have made the work of communicating about positive next steps households can take to actually save money on their electric bills much more difficult. This section will outlaw new and renewing predatory competitive supply contracts in the residential market.

Increasing the Single-Phase Net Metering Cap to 25kW AC

A net metering cap increase to 25kW AC for single-phase projects is significant. Dozens of Resonant solar projects have been limited to 10kW AC in size not because of limited roof space or low electricity usage, but simply because they needed to stay below this policy threshold to ensure they would receive full value net metering credits for any excess production in summer months. Raising the cap makes sense, and would be great news for residential households that are increasing their usage by electrifying heating, cooling, and personal transportation and would also help small commercial projects, like the nonprofit and affordable multifamily projects we work on.

Expanding the Single Parcel Rule Exemption

The single parcel rule has severely limited the benefits of going solar for organizations with multiple buildings on a single tax parcel, or multiple electrical meters on a single building. This change brings a blanket exemption for affordable housing providers and significant exemptions for other organizations and scenarios (e.g. condo developments with scattered single-family homes or townhouses on a single parcel). It’s a common-sense change that will have a huge positive impact. Without this in place, we have to spend thousands on legal fees preparing briefs for the DPU to review exception requests, which can take over 12 months for them to review and approve.

These are transformational changes, but the bill needs your support to ensure it isn’t watered down in the coming months. 

The best thing to do right now is to call your State Representative since the senate has already voted in support of these issues. 

You can find your local legislators and their contact information at: 

https://malegislature.gov/search/findmylegislator 

If you’re interested in more than the top three issues, keep reading! 

What follows is intended to summarize the provisions that will impact Resonant Energy and our community’s areas of focus: environmental justice and equitable solar PV deployment. For more summary of all of the climate provisions not just related to solar PV, including EVs, wind power, and changes to natural gas policy, check out the WBUR Bill Summary.

Section 4 Overview - Clean Energy for Higher Education & Technical Schools

This section amends a previous bill to add matching grant funding for solar PV, battery storage, and other clean energy projects at public higher education institutions and vocational-technical schools.

This is great news for our publicly-funded learning institutions in Massachusetts, many of which may not have the upfront capital to benefit from investments in clean energy. Savings from these projects will hopefully open up more resources (and cleaner air) for students in the Commonwealth.

(Lines 49-63; pages 4-5)

Section 6 Overview - Clean Energy Workforce Development Program

This section adds a requirement for the Massachusetts Clean Energy Center (MACEC) to start a workforce development program geared toward the clean energy economy. This program will specifically target women- and minority-owned small businesses (W/MBE), as well as residents of environmental justice (EJ) neighborhoods, former fossil fuel workers, and any other underrepresented populations within the clean energy workforce.

(Lines 67-92; pages 5-6)

Section 7 Overview - Clean Energy Investment Fund 

Following the previous section, this adds another responsibility for the MACEC; a clean energy investment fund. This fund will have broad objectives around clean energy. It will seek to support:

• Clean energy research and development in the technology space

• Clean energy training programs at public higher education and vocational institutions

• Matching federal funds for clean energy research projects in Massachusetts

• Clean energy infrastructure improvements

The fund will also support studies investigating:

• The relationship between clean energy infrastructure and existing natural habitats and ecosystems

• The intersection of commercial fishing and clean energy industries

All good things, in our opinion!

(Lines 93-128; pages 6-8)

Section 35 Overview - Single-Phase Net Metering Cap Increase  

This section increases the cap to qualify for net metering credits on a single-phase system to 25kW AC, from 10kW AC. 10kW AC was a relatively small amount for most buildings other than a single-family home. As a result, many solar installations limited themselves to this cap, even if more building usage and roof space were available. 

This change will allow many more types of properties to take advantage of the favorable full net metering rates, and ultimately bring more renewable energy to the commonwealth’s grid. While a proposal to raise this cap to 60kW for both single and three-phase was rejected (which would have been very impactful for our affordable housing and nonprofit projects that currently face a gap between 25 kW-AC and 60 kW-AC in the state’s policy around net metering), this section still marks progress for small scale-solar.

(Lines 327-330; page 17)

Section 36 Overview - Market Net Metering Update 

As an addendum to the previous section, this section clarifies that for single-phase projects greater than 25kW AC, Market Net Metering Credits (MNMC) will be applied. MNMCs are generally worth about 60% of the net meter credit value. 

Previously, MNMC were applicable to single-phase projects over 10kW AC (and three-phase over 25kW AC). With the change in section 35, this section updates that language as a logical follow up to keep all of the definitions lined up and consistent.

(Lines 331-338; pages 17-18)

Section 37 Overview - Expanding the Single Parcel Rule Exemption 

This section brings much-welcomed relief to the rule limiting a single net metering facility per tax parcel. The change will allow unlimited net metering facilities for affordable housing (defined as low or moderate-income). It will also allow unlimited net metering facilities up to 2 MW AC; on any public or government-owned parcel, on any “separate and distinct” rooftops on a parcel, or installed more than a year apart on a parcel. 

This is big news for Resonant and our partners, as many of the affordable housing providers we work with have multiple buildings on the same parcel. Over the past few years, we have worked to streamline the exemption process to overcome some of these hurdles, but we welcome any easing of these restrictions. This will save time and money on projects for many of our current and future clients. 

We are looking forward to the wacky interpretations surely to come from the unsurely-worded “separate and distinct rooftops” definition.

(Lines 339-354; page 18)

Section 43 Overview - Outlawing Third Party Residential Electricity Contracts

This section outlaws the sale of individual retail electricity contracts sold by non-utility companies. As evidenced in a recent AG report (and written up by WBUR), these scam contracts charged residential customers an extra $426 million over five years. Lower-income residents were disproportionately affected by these contracts. In many cases, these door-to-door scammers would sell contracts promising lower utility rates for the first year, with ballooning rates for following years hidden in the fine print.

It goes without saying this is great news for residents. Some of these contracts were also binding in such a way that they prevented solar PV installations without exorbitant contract buy-outs. All of them created ill will and skepticism of our industry through hyper-aggressive marketing and sales tactics. A ban would be good news both for Massachusetts residents, as well as the clean energy industry.

(Lines 500-508; page 25) 

Section 50 Overview - A Successor to SMART 

Rounding out the relevant items on this bill is a requirement for the Department of Energy Resources (DOER) to provide the legislature with recommendations for a successor to the Solar Massachusetts Renewable Target (SMART) incentive program. 

These recommendations should consider many of the same factors that the current SMART program attempts to consider; the various benefits of distributed generation facilities (from financial and emissions savings to equity benefits), time-differentiated rates, and the siting of projects in underserved areas (in more densely populated EJ communities instead of greenfields in central MA, for example). 

The DOER is given a deadline of December 31, 2022, to submit these recommendations. However, we shouldn’t expect a successor program to actually come into effect for another few years, as the SMART program was only just recently extended. 

(Lines 654-667; page 32)

---

If you are interested in moving these issues forward, again, the best thing to do right now is call your State Representative, since the Senate has already voted in support of these issues. 

You can find your local legislators and their contact information at: 

https://malegislature.gov/search/findmylegislator 

Thank you!

Let it Snow: Solar and Winter Weather

Let it Snow: Solar and Winter Weather

By: Rachel Gentile

As a Massachusetts-based solar provider, questions about how changing weather and cold winters affect solar production, are above and beyond the most common item we hear from clients. In fact, we get questions about weather-related issues almost as much as people from the Northeast complain about the weather! Now that the days are getting shorter and growing ever more chilly, we want to take some time to answer these recurrent and important questions about how winter weather impacts your solar system and explain how we use past data to account for changing weather in our analysis process.

Seasons:

Every Northeasterner knows that the cold is approaching when the sun starts setting earlier, since the further north you live, the shorter your days are in the winter. Summer is the best season for solar production because the days are longer, meaning that solar panels are working for more hours of the day than they do in fall, winter and spring. Though the cooler months have fewer daylight hours, they make up for some of this loss with greater production efficiency, thanks to the impact of temperature on output.

Solar power generation varies seasonally, with the highest production occurring in the summer months when daylight hours are longer.

Temperature:

Photovoltaic (PV) solar harnesses energy from the light of the sun—not the heat—meaning energy is produced even in the bitter-cold Northeastern winters. Temperature does not affect the amount of energy the solar panels receive, but the panels are more efficient at converting that energy into electricity when it’s cold out and they are less likely to surpass their peak operating temperature.

Electricity is produced when light hits the panel and the electrons in the panel move from a “resting” state to an “excited” state. When the panels are cold, there is a greater difference in energy between the excited state and the resting state, which allows the panels to convert the energy into electricity more efficiently.

Panels are typically tested at 77°F, which means that when the temperature is higher, the panels will be less efficient and if the temperature is lower, the efficiency will be greater. Much like your car heats up when it’s parked in the sun, solar panels can get very warm throughout the day, but if the air is cold, it can cool the panels and increase efficiency. Therefore, the best days for solar panel efficiency are cold, sunny days like we typically see in late fall and early spring

For good record, unless you plow your roof, you don’t need to clear your solar panels!

Snow:

A light dusting of snow does not significantly prevent light from reaching the panels. As more snow starts to accumulate and cover the panels, it can prevent electricity production until the snow melts or slides off. Luckily, if even part of a panel is exposed, it can still produce electricity. 

It may sound counterintuitive, but snow can actually be good for solar production. When the snow melts or slides off, it carries away any dust or dirt that may have accumulated on the panels. Clean panels produce more electricity than dirty ones, so the occasional rain or snowstorm is a good thing. Sometimes when snow slides off of sloped arrays, it all slides off in one large sheet so don’t be alarmed if you hear a loud crash after a snowfall—it’s just mother nature cleaning.

Rain/Clouds:
As we’ve already discussed, the best weather for solar panels is clear, sunny skies and cooler air, however, solar will still produce energy on rainy or cloudy days. On very cloudy days, panels produce anywhere between 10-25% of the energy that they would on a sunny day. The water droplets in clouds and rain scatter light, meaning that less energy reaches the panels and can be converted into electricity. Though we wish every day was bright and sunny, we know that weather varies in the Northeast and the occasional cloudy day won’t hurt your solar production in the long run.

Weather in our region may feel unpredictable, but when we create the production estimates that go into our project proposals, we put a lot of thought into making them as accurate as possible. Our software utilizes a dataset with 25 years of local weather data to predict how much energy your system will produce each year so you can feel confident in your investment. There are many variables that contribute to the amount of energy your solar panels will produce but regardless of your day-to-day production, solar is a long-term investment that will provide value for years to come.