The Mass Solar Loan Program: How It Worked and What Replaced It
The Mass Solar Loan program was a state-backed initiative that made buying solar panels highly affordable for Massachusetts residents. While the program has closed to new applications, understanding how it worked helps you navigate the financing options that replaced it.
Massachusetts built this program to help homeowners overcome the steep upfront cost of solar installations. It connected buyers with local lenders who offered heavily subsidized, low-interest loans. The state provided the financial backing, making it easier for banks to lend and cheaper for homeowners to borrow.
Today, the Massachusetts solar market operates differently. Direct loan subsidies have largely been replaced by performance-based incentives and specialized private financing.
What was the Mass Solar Loan program?
The program was a partnership between the Massachusetts Department of Energy Resources (DOER), the Massachusetts Clean Energy Center (MassCEC), and participating local banks and credit unions. The state did not lend the money directly.
Instead, the government used public funds to buy down the interest rates and reduce the principal balances on private loans. This mechanism allowed local lenders to offer terms that standard financial markets could not match.
For the homeowner, the process was seamless. You applied for a solar loan through a participating local bank, and the state applied its financial support directly to your account behind the scenes.
How the financing mechanics worked
The Mass Solar Loan program relied on three primary financial levers to make solar accessible. Each addressed a specific barrier to entry for homeowners.
Interest rate buy-downs
The state paid a portion of your loan’s interest upfront to the lender. This allowed the bank to offer you a fixed, below-market interest rate for the entire term of the loan.
Lower interest rates drastically reduced the monthly payment. This made it much easier for the monthly cost of the loan to fall below the homeowner’s previous monthly electricity bill.
Income-based loan support
For lower- and moderate-income households, the state offered direct principal reduction. When an eligible homeowner took out a loan, the program paid off a percentage of the total loan balance right at the start.
This meant the homeowner borrowed less money overall. It leveled the playing field, ensuring that solar ownership was not restricted only to high-income earners.
The loan loss reserve
Banks are traditionally cautious about lending to people with lower credit scores. The state created a loan loss reserve to absorb some of that risk.
If a borrower defaulted on their Mass Solar Loan, the state reimbursed the lender for a significant portion of the lost money. Because their risk was lowered, banks were willing to approve applicants with credit scores that would normally be rejected.
Eligibility requirements for the original program
To qualify for a Mass Solar Loan, residents had to meet strict criteria regarding their property and the equipment they chose. The rules ensured state funds were spent on efficient, permanent installations.
You had to be a Massachusetts resident installing solar on a primary or secondary home in the state. The property could have up to three residential units, but commercial buildings were excluded.
The equipment also had to meet technical standards. Homeowners were required to use approved solar installers, and the system had to be connected to the grid. Off-grid systems and DIY installations were not eligible for the funding.
Why did the program close?
State incentive programs operate on fixed budgets. The Mass Solar Loan program hit its funding capacity after successfully helping thousands of residents install solar panels.
Once the allocated public funds were exhausted, the DOER and MassCEC stopped accepting new applications. The program achieved its goal of stimulating the local solar market and proving to lenders that solar loans are a safe, viable financial product.
What replaced the Mass Solar Loan program?
The end of the state loan program did not end solar incentives in Massachusetts. The state shifted its strategy from subsidizing upfront loans to rewarding ongoing energy production.
The SMART Program
The Solar Massachusetts Renewable Target (SMART) program is the state’s current primary solar incentive. Instead of lowering your initial loan cost, SMART pays you for the electricity your system generates.
When you install an eligible system, your utility company pays you a fixed base rate per kilowatt-hour of solar power produced. These payments continue for ten years for residential systems.
The SMART program uses a declining block structure. As more people sign up in your utility territory, the incentive rate drops for the next group of applicants. Securing your spot early guarantees a higher payout rate for your ten-year term.
The Federal Solar Tax Credit
The federal government offers an Investment Tax Credit (ITC) for solar installations. This mechanism reduces your federal income tax liability by a percentage of your total system cost.
This is a non-refundable tax credit, meaning it offsets taxes you owe rather than providing a direct cash refund. You can roll over unused portions of the credit to subsequent tax years if your tax bill is lower than your credit amount.
The Mass Save HEAT Loan
Many Massachusetts residents look to the Mass Save HEAT Loan when planning energy upgrades. It offers zero-interest financing for eligible home improvements.
However, the HEAT Loan does not cover solar panels. It is designed for energy efficiency upgrades like insulation, heat pumps, and battery storage systems. If you are adding a battery alongside your solar panels, you can use the HEAT loan for the battery portion of the project.
How to finance a Massachusetts solar system today
Without the state-subsidized loan, you must rely on the private market. Fortunately, because the original program proved solar loans are safe, many lenders now offer specialized solar financing.
Specialized solar loans
Many credit unions and specialized online lenders offer dedicated solar loans. These are unsecured loans designed specifically for solar installations, often featuring terms from ten to twenty years.
Solar installers usually partner with these lenders to offer financing directly at the point of sale. While convenient, dealer-arranged financing often includes hidden origination fees that inflate the total cost of the system. Always ask for the cash price of the system to compare against the financed price.
Home equity financing
A Home Equity Line of Credit (HELOC) or a home equity loan allows you to borrow against the value of your house. Because the loan is secured by your property, the interest rates are typically lower than unsecured solar loans.
The interest on a home equity loan used to improve your home is often tax-deductible. You will need sufficient equity in your home and a strong credit score to qualify for the best rates.
Solar leases and Power Purchase Agreements (PPAs)
If you prefer not to take out a loan, you can sign a lease or a PPA. In these arrangements, a third-party company installs and owns the solar panels on your roof.
With a lease, you pay a fixed monthly fee to use the equipment. With a PPA, you pay a set price for every kilowatt-hour the panels generate. Because you do not own the system, you cannot claim the federal tax credit or the SMART program payments; the third-party owner takes those incentives.
Does solar still make financial sense without the state loan?
The financial logic of solar power relies on replacing a variable, rising utility bill with a fixed, predictable loan payment. Massachusetts has some of the highest electricity rates in the country, which makes the math highly favorable.
When you finance a solar system, you calculate your break-even point. This is the moment when your total savings on electricity surpass the total cost of your loan, including interest.
Because grid electricity is expensive in Massachusetts, your avoided costs are high. Even with standard market interest rates, a well-designed solar system on a sunny roof will typically generate enough electricity to cover its own loan payment and then some.
A north-facing roof with heavy tree cover will generate far less power than a south-facing roof with no shade. Get the exact production estimates for your specific property before you commit to a financing contract.
Frequently Asked Questions
Can I still apply for a Mass Solar Loan?
No. The program has permanently closed to new applicants after exhausting its state funding.
What happens if I already have an active Mass Solar Loan?
Your loan remains completely active and unchanged. You will continue making payments to your lender under the exact terms you originally signed.
Does the Mass Save HEAT Loan cover solar panels?
No. The HEAT loan explicitly excludes solar photovoltaic panels, though it can be used to finance home battery storage systems.
Before you commit to a long-term solar loan, you should understand exactly what you are currently paying for grid power. Check your current rates and explore your options using our plan comparison tool to ensure your solar math is built on accurate numbers.