Massachusetts leads New England in renewable energy adoption, and homeowners with slate roofs—particularly on historic homes—can benefit significantly from state and federal solar incentives. Here’s what you need to know:
Historic District Flexibility
Recent state legislation encourages local review boards to allow solar installations in historic districts, especially when panels are not visible from public streets. This is excellent news if your slate-roofed home is under preservation oversight.
Federal and State Tax Incentives
- Federal and State Tax Incentives
- Federal Investment Tax Credit (ITC): Homeowners receive a 30 percent tax credit on the total solar system cost, including equipment and installation, through 2032.
- This generous federal incentive—also known as the Residential Clean Energy Credit—can significantly reduce your upfront solar costs. The credit covers not only your solar panels, but also related equipment, labor, permitting, and even sales tax. To benefit, you must purchase your system with cash or a solar loan; leased systems do not qualify.
- When you file your federal income taxes, you can claim this credit against your tax bill. If your tax liability is lower than your credit, you can roll over the remaining amount to future tax years—potentially indefinitely under current IRS rules.
- Keep in mind: although the ITC is currently available through 2032, recent legislation can sometimes change the expiration date, so timely installation is wise. Your system must be installed by the specified deadline to qualify.
- Consult a tax professional for guidance on your specific situation and to ensure you file the appropriate forms when claiming your credit.
- Massachusetts Personal Income Tax Credit: You can claim 15 percent of your installation costs (up to 1,000 dollars) on your state tax return.
Sales and Property Tax Benefits
- Sales Tax Exemption: All solar equipment and installation services are exempt from the 6.25 percent Massachusetts sales tax.
- Property Tax Exemption: Added home value from a solar system is exempt from Massachusetts property taxes for 20 years.
SMART Program and Net Metering
- SMART Program and Net Metering
- SMART Program: Performance-based incentives provide fixed-rate payments per kilowatt-hour for 10 years. These benefits are especially helpful for residential projects.
- The SMART (Solar Massachusetts Renewable Target) program was launched in 2018 as a successor to the state’s SREC initiative, aiming to reward solar owners for the energy they produce. Under SMART, customers of Eversource, National Grid, and Unitil received a fixed payment for every kilowatt-hour generated, making solar installations more financially attractive—especially for homeowners looking to offset their energy bills.
- However, due to overwhelming demand, available incentive capacity filled up quickly. As of 2023, with high participation and rising electricity rates, most residents now receive a significantly reduced monthly incentive or, in some cases, no payment at all. State officials have indicated that a new incentive program is being developed to continue supporting solar adoption, with updates expected in the near future.
- In the meantime, some households may still qualify for modest compensation through Massachusetts’ Renewable Portfolio Standard (RPS) program. Additionally, if you pair your solar panels with energy storage, you could be eligible for ongoing incentives under remaining SMART provisions or local battery rebate programs.
- Net Metering: Utilities credit homeowners for excess solar power sent back to the grid at nearly full retail value, with credits rolling over month to month. If your solar panels produce more electricity than your home uses during the day, that surplus power is exported to the grid, and you accumulate credits on your utility bill. When the sun isn’t shining—like at night or on cloudy days—you can draw electricity from the grid and use those credits to offset the cost. In many cases, this means you could owe very little, or sometimes nothing at all, for your electricity usage.
- It’s worth noting that while most investor-owned utilities in Massachusetts are required to offer net metering for systems with inverters rated under 25 kW, a few municipal utilities do not participate. For businesses or larger residential properties with three-phase power, net metering is available for systems with inverter ratings between 26 and 60 kW. These rules ensure that most homeowners and many businesses can take full advantage of the savings that net metering provides.
Low-Interest Loan and Local Programs
- Mass Save HEAT Loan: Offers zero percent financing up to 50,000 dollars for solar and other energy efficiency upgrades.
- Municipal Rebates: Some Massachusetts towns offer local solar rebates ranging from 50 cents to 1.25 dollars per watt.
Why Slate Roofs in Massachusetts Are Primed for Solar
- Historic slate roofs remain protected through recent legislative updates.
- Combining federal, state, and local incentives can reduce upfront costs by 40 to 60 percent. For example, the average cost of a 5 kW solar panel system in Massachusetts is about $15,372. With the 30% Federal Investment Tax Credit (ITC), that price drops by $4,612—bringing your net cost to roughly $10,760. Add in the Massachusetts Personal Income Tax Credit, which covers 15 percent of your installation costs (up to $1,000), plus local rebates and sales tax exemptions, and your savings can stack up quickly. While the Federal ITC is set to remain at 30% through 2032, the best value often comes to those who act before incentive programs change or expire.
- These incentives, paired with performance-based programs like SMART and net metering, make going solar on a slate roof in Massachusetts more affordable than ever.
- With high electricity rates in Massachusetts, solar provides a strong long-term return on investment.
What Slate-Roof Homeowners Should Do Next
- Check with your local preservation commission to understand visibility and design requirements.
- Work with a solar installer who specializes in slate roofs and uses non-invasive mounting systems.
- Calculate your personalized return by combining tax credits, SMART payouts, net metering, and local rebates.
Final Word
Massachusetts offers some of the most generous solar incentives in the country. Thanks to smart legislation and innovative technology, homeowners with slate roofs can go solar without compromising the beauty or value of their historic homes. Ready to get started? Contact a solar on slate professional today.
