All states · Massachusetts
Updated October 2026 · ranks 4 of 50
Yes, and faster than in almost any other state
6 kW system · $17,900 after incentives · $2,616 returned in year one
0 yrs25 yrs
A break-even point of 6.8 years is short enough that the decision turns mainly on how long the owner intends to remain in the property. The system is then owned outright for roughly 19 further years of its warranted life.
Yes. At 6.8 years, a purchased system in Massachusetts repays its cost faster than in almost any other state. The high retail electricity rate accounts for most of that advantage.
The case modeled here approximates an average Massachusetts household on the state average rate of 30.5¢, with an unshaded roof and no financing: $17,900 of capital, $2,616 returned in the first year, and break-even near year 6.8. Above-average consumption, a south-facing roof or a competitive installed price shorten that period; shading, a loan carrying a dealer fee, or a sale within six years lengthen it. Exports earn 30.5¢, close to the retail rate, so daytime occupancy makes little difference to the result.
At 30.5¢ per kilowatt-hour, Massachusetts pays 85% more for electricity than the United States average of 16.5¢. A high retail rate is the principal driver of a short payback, since each kilowatt-hour generated displaces an expensive one.
A 6 kW array in Massachusetts generates approximately 7,811 kWh a year, above the national median. Irradiance is the one input that no change in policy can remove.
Massachusetts operates full-retail net metering. Each exported kilowatt-hour is credited at the same 30.5¢ charged for consumption, so the grid functions as storage and there is no penalty for generating more than is consumed during daylight hours. This is the principal reason payback here is shorter than in states with comparable irradiance.
State support reduces the installed price of $18,900 by $1,000, to $17,900 before financing. This comprises $1,000 of state rebate and tax credit, plus an SREC market paying approximately $30/MWh for the certificates the system generates.
A 6 kW system, the size typical of Massachusetts households, costs approximately $18,900 installed at $3.15 a watt before deductions. State support reduces this by $1,000, to $17,900. That is well above the $2.85 national median, which is why a high retail rate alone does not shorten the payback here as much as it first appears. Smaller systems cost more per watt and larger ones less, although sizing beyond on-site consumption is not penalized, since exports earn 30.5¢.
| System size | 6 kW |
|---|---|
| Annual production | 7,811 kWh |
| Installed cost | $18,900 |
| Incentives | -$1,000 |
| Net cost | $17,900 |
| Electricity rate | 30.5¢ / kWh |
| Export credit | 30.5¢ / kWh |
| Year-one saving | $2,616 |
| Break-even | 6.8 years |
| 25-year gain | $63,261 |
Of the 50 states published here, Massachusetts ranks fourth for how quickly a bought system repays itself. Fastest right now: Hawaii, New York, Illinois, Maine. Slowest: South Dakota, Louisiana, North Dakota, Tennessee. Compare them all on the map.
Solar economics change at state lines rather than at county lines, because the export tariff and the netting period do. These states share a border with Massachusetts, and the figure each produces on the same assumptions.
About $18,900 installed for a 6 kW system at $3.15 a watt. State support reduces this by $1,000, to $17,900. Larger systems are not penalized here, since exports earn the full 30.5¢.
Yes, and faster than in almost any other state. A 6 kW system breaks even in 6.8 years on the assumptions used here, following the expiry of the 30% federal tax credit on 31 December 2025.
Approximately $2,616 in the first year on a 7,811 kWh system, rising thereafter as Massachusetts electricity rates increase. Exports are valued the same as self-consumption at 30.5¢, so the figure holds regardless of daytime occupancy.
A 6 kW array is about 14 modules at 430 W and generates 7,811 kWh a year here, which covers a household using roughly that much. Sizing above on-site use is not penalized here, since exports earn 30.5¢. The sizing calculator works it out from a bill.
Yes, and faster than in almost any other state. The retail rate here is 30.5¢ against a national average of 16.5¢, exports earn 30.5¢, and a 6 kW system breaks even in 6.8 years. What separates Massachusetts from states with similar sunshine is the rate and the export tariff, not the weather.
Massachusetts operates full-retail net metering.
Generation is taken from NREL PVWatts v8 for the largest metropolitan area in Massachusetts, south-facing at 20°. The retail rate is from the EIA and the export credit from the state's net metering rule. The break-even figure incorporates 0.5% annual panel degradation, 3% annual electricity price growth, $150 a year in maintenance and an inverter replacement in year 12. The federal credit is set to $0 — Section 25D expired 31 December 2025. Credits accumulate across the year, so close to 95% of generation is valued at the full retail rate. Full method and sources. Privacy. Export terms checked against the state source in August 2026.
These are estimates for comparison between states, not quotations. Roof orientation, shading, consumption pattern and installer pricing all affect the result. At least three written quotations are advisable before purchase.