Solar Calculator Massachusetts 2026

Massachusetts Solar in 2026: Expensive Power, Deep Incentives

Massachusetts residential electricity averages about 29 to 30 cents per kWh — Eversource and National Grid supply rates routinely spike higher in winter — so even the state's modest 4.1 peak sun hours per day convert into outsized savings. A kWh you generate on your roof in Boston is worth roughly double the same kWh in Texas. Start with the USA solar calculator for your baseline, then stack the Bay State programs below.

Net Metering and the SMART Program

Residential systems up to 10 kW on investor-owned utilities receive net metering credits at close to the full retail rate, carried forward month to month (municipal light plants set their own rules, so check locally). The SMART program then adds a production payment on top. The original design was a declining block — the per-kWh rate stepped down as each utility's capacity blocks filled — and it has since been reworked: the proposed SMART 3.0 pays residential systems a flat 3 cents per kWh for 20 years, doubled for low-income households, with an adder for pairing storage. Final tariff approval was still pending at the Department of Public Utilities as of mid-2026, so verify current status and rates with MA DOER before counting the income.

The State Credit, ConnectedSolutions, and Tax Exemptions

• The Massachusetts residential energy credit — 15% of system cost up to $1,000 off your state income tax — still applies in 2026.
• ConnectedSolutions pays home-battery owners around $275 per average kW delivered during summer peak events, commonly $1,000 to $1,500 per year for a typical battery.
• Solar equipment is exempt from the 6.25% sales tax, and the added home value is property-tax exempt for 20 years.

The Federal Situation, Honestly

The 30% federal residential credit (Section 25D) ended for owned systems placed in service after December 31, 2025, so 2026 cash and loan buyers get no federal credit. Leases and PPAs can still pass through roughly similar value because the provider claims the commercial 48E credit (expected through about 2027) — but third-party deals may also claim the SMART payment, so read the contract. Model both routes in the solar savings calculator.

A Worked Massachusetts Example

A 7 kW system at $3.30 per watt costs about $23,100; the state credit trims that to roughly $22,100. At 4.1 sun hours it produces near 10,500 kWh per year, worth about $3,100 against 29.5-cent power, plus roughly $315 per year if SMART 3.0 payments are approved as proposed — a payback around 6.5 to 7 years with zero federal help. Add a battery and ConnectedSolutions revenue can shave another year off; size it with the battery bank calculator and sanity-check outage coverage in the battery runtime calculator. Heating with oil or propane? Pairing solar with heat pumps sized in the mini-split calculator is often the bigger win.

Solar calculators for other US states

Localized rates, net-metering and incentive context for more states — or use the national USA solar calculator (all 50 states + DC selectable).

Frequently asked questions

Yes, with a caveat. The program has been restructured from its old declining-block design into a proposed flat-rate model — about 3 cents per kWh for 20 years for residential systems, doubled for low-income households, with a storage adder — and residential systems up to 25 kW are exempt from the annual capacity cap. However, final tariff approval was still pending at the DPU as of mid-2026, so confirm current status with MA DOER.

Yes. The residential energy credit remains in place: 15% of your system cost, capped at $1,000, taken against Massachusetts state income tax, with unused amounts carried forward up to three years. With the federal residential credit gone for purchases after 2025, this is now the only direct tax credit available to Bay State solar buyers — small, but it still applies.

Eversource and National Grid pay roughly $275 per average kW your battery delivers during summer peak-demand events, which typically works out to $1,000 to $1,500 per year for one home battery — often more for larger or multiple units. Payments run each summer season for the length of your enrollment. Rates are reviewed periodically through the Mass Save process, so confirm the current offer with your utility.

No — the Section 25D residential credit ended for owned systems placed in service after December 31, 2025. Leasing or a PPA can recapture much of that value because the installer claims the commercial 48E credit through about 2027 and typically bakes it into pricing, but the company may also keep SMART payments and the equipment. Massachusetts' own stack — the 15% state credit, net metering, SMART, and ConnectedSolutions — is what keeps purchased systems attractive.