A real cost breakdown for a typical 6kW system in Maine, not just a national $/watt figure.
Maine has a fairly typical electricity rate nationally at approximately $0.21/kWh, and a solid, average solar resource at 3.9 peak sun hours a day. Combined with a regional installed-cost estimate of $3.00/watt, a standard 6kW residential system runs approximately $15,650 before any incentives.
| Line item | Estimated cost | Share of total |
|---|---|---|
| Equipment (panels, inverter, racking) | $9,900 | 63% |
| Labor / installation | $5,400 | 35% |
| Permitting & inspection | $350 | 2% |
| Total (before incentives) | $15,650 | 100% |
A 6kW system in Maine costs 10% less than the average across the 25 states we track ($17,372), and the electricity rate it offsets is 30% higher than the 0.16 USD/kWh average across those same states. That combination is what actually determines whether Maine is a faster- or slower-than-average place to go solar — a lower system cost alone doesn't help if the rate you're offsetting is also low, and vice versa. See how every state stacks up on the Electricity & Solar Rate Tracker.
At $1,435 in estimated annual value from 6,833 kWh of yearly production, this system pays back in roughly 11 years — a payback period in line with the national average. Maine: Net energy billing with a kWh credit carried forward on the bill. On incentives specifically: Efficiency Maine has run rebate programs for residential solar — check current funding status before budgeting around a specific amount. The federal residential tax credit (Section 25D) expired for owned systems after December 31, 2025 — see our 2026 tax credit guide for what that means for your net price.
A typical 6kW residential solar system in Maine costs approximately $15,650 installed in 2026, based on a regional estimate of $2.61/watt — equipment usually makes up about 55% of that, labor about 30%, with the rest in permitting.
At Maine's average rate of $0.21/kWh, a 6kW system pays back in roughly 11 years — a payback period in line with the national average. Your actual number depends on your usage and roof; check it precisely with the Solar Panel Cost Calculator.
A 6kW system in Maine costs 10% less than the 25-state average of $17,372, while the electricity rate it offsets is 30% higher than the 0.16 USD/kWh average across those states.