Maine solar installation & market data
The Maine solar market at a glance.
Maine has about 22,481 solar systems totalling 1.00 GW, as reported by its utilities through July 2026. 34 MW of residential solar was added in the trailing twelve months, down 3.9% on the twelve months before. 4.8% of owner-occupied homes have gone solar and 0.7% of solar customers have a battery. SolarDNA tracks 16,869 individual installations here, with a median residential cost of $3.71 per watt, from 0 installers.
Maine's SolarDNA Market Score: 36 out of 100.
Maine scores 36 out of 100 on SolarDNA's Market Score, a 0-to-100 scale benchmarked against every other state market. That is higher than 33% of U.S. states. Grade C (Good).
The score combines 5 subscores, each computed from observed market data:
- Velocity (46): trailing-12-month growth in solar added versus the prior twelve months, so accelerating markets score higher.
- Cost (61): median installed $/W relative to the national median (a cheaper market scores higher).
- Incentives (27): net-metering coverage, RECs a new system can earn, state tax credit, rebate program and tax exemptions (components listed below).
- Resource (10): annual solar irradiance, so the same system produces more where this score is high.
- Depth (33): proven demand: how many systems are already installed, with a bonus for markets that show adoption without being saturated.
Net energy billing; SREC-style market is small.
Federal: Federal residential credit (25D) ended for systems placed in service after Dec 31, 2025. Third-party-owned systems can still use the commercial credit (48E) through 2027 under construction-start rules.
State-level averages hide wide variation. Here's how to go deeper in the app:
- 1Narrow to a zip codeZip metrics give a far more accurate picture of the exact neighborhoods you are considering.
- 2Apply filtersFilter by score, growth, $/W, adoption and permits to reach the markets that actually match your model.
- 3Benchmark the installersSee who already wins there, how fast they are growing, and what they charge per watt.
How SolarDNA defines these metrics
Solar systems
Solar systems is the market-size figure: the systems utilities report on their lines, plus an estimate (sized from reported capacity) for systems outside net metering. It is current for every state.
How SolarDNA calculates solar systems →Tracked installations
Tracked installations are the individual residential, commercial and utility-scale systems SolarDNA holds a record for. SolarDNA de-duplicates the same system across records. Pricing, installers, equipment and every zip-level figure come from these records.
How SolarDNA calculates tracked installations →Median installed cost
Median installed cost is the middle price per watt (DC) that homeowners paid for a residential system in the trailing twelve months, before incentives. Quartiles show the spread.
How SolarDNA calculates median installed cost →Adoption rate
Adoption rate is the share of owner-occupied homes with a residential solar system. It measures how saturated a market is, not how fast it is growing.
How SolarDNA calculates adoption rate →12-month growth
For a state, growth compares the residential solar capacity added in the trailing twelve months with the twelve months before, from utility-reported totals with one-off reporting corrections smoothed out. For cities and zip codes it compares tracked installations.
How SolarDNA calculates 12-month growth →Battery share
Battery share is the portion of a state's solar customers whose system includes a battery, as reported by utilities.
How SolarDNA calculates battery share →Permits
Permits count the solar building permits filed in the last twelve months. They lead installations by several months, which makes them the earliest read on demand.
How SolarDNA calculates permits →Market Score
SolarDNA's Market Score grades each market from 0 to 100 on solar sales potential, weighing velocity, cost, incentives, solar resource and installer depth. Markets are benchmarked against every other market in the country, and the letter grade is set on a curve: A is the top 10% of markets, C the middle 40%, F the bottom 10%.
How SolarDNA calculates market score →See what a specific Maine zip code looks like
Drop in any Maine zip code and SolarDNA opens its market card: score, installs, median $/W, growth and permits, benchmarked against the state.
Dive deeper into the Maine market
Market size & momentum
Systems, capacity, monthly additions, battery share and solar customers by utility.
- •How many solar systems are there in Maine?
- •Is solar still growing in Maine?
- •Which utility territories are adding the most?
Pricing & economics
Installed $/W, quartiles, system sizes and simple payback.
Growth & adoption
Installs by year, adoption, TAM penetration and battery attach.
Installers
The league table: volume, momentum, system size and pricing per installer.
- •Who installs the most in Maine?
- •Which installers are growing fastest?
- •What do they charge per watt?
Utilities & incentives
Retail rates by utility, net metering, SREC value and the planned utility pipeline.
- •What are electricity rates in Maine?
- •Which utilities offer net metering?
- •How big is the utility-scale pipeline?
How big Maine's solar market is, and where it is heading
Totals reported by Maine's utilities through July 2026 (latest months are preliminary)
Trailing-12-month residential capacity added carried forward at half the observed growth rate (capped at ±30%), with a ±10% band. Not a forecast of permits or policy.
Solar customers by utility in Maine
Net-metered solar customers through July 2026
| Utility | Solar customers | Capacity | Added, 12 mo | Growth | With battery |
|---|---|---|---|---|---|
| Central Maine Power Co | 19,221 | 940 MW | 3,163 | ▼ 12.9% | — |
| Versant Power | 3,061 | 49 MW | 533 | ▼ 11.5% | 5.0% |
What solar costs in Maine
Residential systems, trailing twelve months
How fast Maine is going solar
From SolarDNA's installation records, which run through December 20, 2024; current momentum is in the market totals above
Top installers in Maine
Ranked by installations in this state
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|
Top zip markets in Maine
Ranked by installations · click for the zip market
| Zip | Installs | $/W | Growth | Score |
|---|---|---|---|---|
| 04011 Brunswick | 440 | $3.84 | — | 41.9 C |
| 04074 Scarborough | 415 | $3.24 | — | 44.6 C |
| 04032 Freeport | 361 | $3.53 | — | 43 C |
| 04105 Falmouth | 358 | $3.56 | — | 42.8 C |
| 04005 Biddeford | 296 | $5.80 | — | 32 F |
| 04021 Cumberland Center | 280 | $3.83 | — | 41.2 C |
| 04915 Belfast | 268 | $3.44 | — | 43 C |
| 04072 Saco | 254 | $3.55 | — | 42.4 C |
| 04038 Gorham | 251 | $3.75 | — | 41.4 C |
| 04106 South Portland | 236 | $3.72 | — | 41.5 C |
| 04330 Augusta | 227 | $3.88 | — | 40.7 C |
| 04103 Portland | 226 | $3.90 | — | 40.6 C |
| 04096 Yarmouth | 218 | $3.59 | — | 42 C |
| 04107 Cape Elizabeth | 210 | $3.25 | — | 43.6 C |
| 04079 Harpswell | 208 | $4.20 | — | 39.1 C |
Counties in Maine
Zip markets grouped by county · click for the county market
| County | Zip markets | Installs |
|---|---|---|
| Cumberland County | 43 | 4,872 |
| York County | 36 | 2,497 |
| Kennebec County | 28 | 1,130 |
| Waldo County | 19 | 869 |
| Androscoggin County | 16 | 805 |
| Lincoln County | 23 | 753 |
| Knox County | 19 | 744 |
| Oxford County | 30 | 679 |
| Sagadahoc County | 8 | 648 |
| Somerset County | 26 | 400 |
| Franklin County | 17 | 254 |
| Penobscot County | 25 | 201 |
Utilities and retail rates
Implied residential rate per utility
| Utility | Type | Res. customers | ¢/kWh | Net metering |
|---|---|---|---|---|
| Central Maine Power Co | Investor Owned | 519,295 | 22.4 | ✓ |
| Versant Power | Investor Owned | 101,697 | 27.5 | ✓ |
| Electricity Maine, LLC | Retail Power Marketer | 17,749 | 16.8 | — |
| SmartEnergy Holdings, LLC | Retail Power Marketer | 17,539 | 16.6 | — |
| Eastern Maine Electric Coop | Cooperative | 10,803 | 17.1 | ✓ |
| Adjustment 2024 | 7,731 | 14.4 | — | |
| XOOM Energy Maine, LLC | Retail Power Marketer | 5,370 | 13.3 | — |
| C. N. Brown Electricity, LLC | Retail Power Marketer | 4,843 | 12.6 | — |
Other solar markets in Maine
Three ways to slice Maine's 16.9K installations
See how the market splits by sector, by battery attach and by installer, updated with every refresh.
See all breakdownsWhen demand peaks in Maine
Quick answers about Maine's market
🛡 Why trust SolarDNA data?
How many solar installations are there in Maine?
How much does solar cost in Maine?
Is the Maine solar market growing?
What is the solar adoption rate in Maine?
Is Maine a good market for solar sales?
How many solar installers work in Maine?
How many solar permits were filed in Maine?
How current is Maine's solar data?
There's a lot more inside the SolarDNA app.
- ◇Zip and city market pages
- ◇Installer league tables
- ◇Territory builder
- ◇Solarizer deal estimates
- ◇Permit activity where reported
- ◇Export the data