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5 Best solar companies in Maine (2023 ranking)

UPDATED JANUARY 2023

There are plenty of solar companies out there – check out this updated ranking for the top rated solar installers in Maine based on shopper preferences. Compare customer ratings, company tiers, and genuine customer feedback to see which installer is the best fit for your solar project.

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Why you can trust EnergySage

The data on this page comes from real solar quotes to real solar shoppers on the EnergySage Marketplace. We give you access to transparent information so you can confidently make informed energy decisions. Learn more about how our Marketplace works and how we make money.

6 companies
177 customer reviews
4.5 average rating

Solar companies in Maine 2023

  • Multi-state
    Established 2015
    Elite Installer
    Whether it’s a residential system, commercial property, landfill, brownfield, large plot of land, airport property, convention center, warehouse, carport, or strip mall, we have the experience to engineer, procure, construct, and maintain an optimum solar array for your home or business.
    Elite EnergySage badge

    Elite Installer

    Screened & Verified

    Whether it’s a residential system, commercial property, landfill, brownfield, large plot of land, airport property, convention center, warehouse, carport, or strip mall, we have the experience to engineer, procure, construct, and maintain an optimum solar array for your home or business.
  • Multi-state
    Established 2010
    Elite Installer
    NuWatt Energy promotes Real Energy Independence and Energy Efficiency with quality systems installs. We install Solar Energy and Heat pump AC systems. We select only quality products from financially-sound manufacturers that can outlast the warranty terms to safeguard our clients' investment in the long run.
    Elite EnergySage badge

    Elite Installer

    Screened & Verified

    NuWatt Energy promotes Real Energy Independence and Energy Efficiency with quality systems installs. We install Solar Energy and Heat pump AC systems. We select only quality products from financially-sound manufacturers that can outlast the warranty terms to safeguard our clients' investment in the long run.
  • Durham, ME
    Established 2012
    Approved Installer
    Maine Solar Solutions takes a consultative approach when working with our customers. Our goal is to provide you with the information you need to make an informed decision.

    We perform free, no obligation solar site assessments and take the time to educate you about how solar works, how solar policy works in Maine and explain the purchasing and financing options we offer.

    We present our prospective customers with various choices for different solar panels and a range of system prices and fina…
    Approved EnergySage badge

    Approved Installer

    Screened & Verified

    Maine Solar Solutions takes a consultative approach when working with our customers. Our goal is to provide you with the information you need to make an informed decision.

    We perform free, no obligation solar site assessments and take the time to educate you about how solar works, how solar policy works in Maine and explain the purchasing and financing options we offer.

    We present our prospective customers with various choices for different solar panels and a range of system prices and fina…
  • Multi-state
    Established 2015
    Advanced Installer
    DeFreitas Enterprises, LLC is a family owned and operated solar installation company based in Chelmsford, MA. We are a 100% in house installation team that has installed on hundreds of homes in New England. We are in control of our process, and only use the best materials on the market. Our team is made of licensed engineers, insured installers & master electricians- ready to take on your next New England solar project. Offering lifetime support, we are your best choice for price, quality, and effici…
    Advanced EnergySage badge

    Advanced Installer

    Screened & Verified

    DeFreitas Enterprises, LLC is a family owned and operated solar installation company based in Chelmsford, MA. We are a 100% in house installation team that has installed on hundreds of homes in New England. We are in control of our process, and only use the best materials on the market. Our team is made of licensed engineers, insured installers & master electricians- ready to take on your next New England solar project. Offering lifetime support, we are your best choice for price, quality, and effici…
  • Topsham, ME
    Established 2018
    Advanced Installer
    All Solar Energy Solutions, LLC offers the best technology, design and craftsmanship accomplished by a knowledgeable and experienced team. We provide comprehensive solar panel consultation, design, engineering and installation services for residential and commercial applications in Maine. Throughout the process, we pledge to provide the highest quality customer service and ethical business practices. We take your business very seriously and believe in creating long lasting relationships. When you have made…
    Advanced EnergySage badge

    Advanced Installer

    Screened & Verified

    All Solar Energy Solutions, LLC offers the best technology, design and craftsmanship accomplished by a knowledgeable and experienced team. We provide comprehensive solar panel consultation, design, engineering and installation services for residential and commercial applications in Maine. Throughout the process, we pledge to provide the highest quality customer service and ethical business practices. We take your business very seriously and believe in creating long lasting relationships. When you have made…
  • Multi-state
    Established 2011
    Approved Installer
    We have the complete experience that allows our team members to take a project from its initial planning stages all the way to commissioning. We have survived the ups and downs of the market and know exactly how to deliver a project on time. Our expedited and veteran installation crews have years of experience. At Invaleon, we in-house all of our expertise, which helps keep our staff local and close.
    Approved EnergySage badge

    Approved Installer

    Screened & Verified

    We have the complete experience that allows our team members to take a project from its initial planning stages all the way to commissioning. We have survived the ups and downs of the market and know exactly how to deliver a project on time. Our expedited and veteran installation crews have years of experience. At Invaleon, we in-house all of our expertise, which helps keep our staff local and close.

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How we determine the best solar companies in Maine

At EnergySage, we care about connecting solar shoppers to high-quality solar energy companies. As such, any solar installers we list above are active on the EnergySage Marketplace in Maine and are pre-screened by our team.

What does it mean to be “pre-screened”? We evaluate every solar panel company to ensure that they’ll provide quality service to EnergySage users. These high-quality installers are approved based on their years of experience, licensing and insurance, reputation, and certifications. When bringing new installers into the EnergySage Marketplace, here’s how we ensure our partners are the best of the best:

  • At least three years of experience installing solar
  • Licensed and insured for solar installations
  • NABCEP certified
  • Reputation for excellent customer service and quality solar installations
  • Installs high quality solar equipment

Our rating tiers

Choosing the right installer can be difficult, especially when you’re deciding between multiple top-notch companies on EnergySage. To make it easier, we created a unique rating system that evaluates our partners’ performance based on real data from our Marketplace.

Elite+ installers are the most experienced, chosen, and celebrated companies on the Marketplace, having provided exceptional service to a high volume of shoppers for at least a year.

Elite installers earn top ratings from customers, endorsements from vendors, and win customers more frequently than their peers.

Advanced installers are among the top half of companies on the Marketplace for responsiveness, reputation, results.

Approved installers passed our rigorous screening criteria for experience, licensing, and positive reviews.

How to pick the best solar installer

When you’ve already narrowed down your options to reputable installers and are trying to decide which quote to move forward with, here are three final considerations that distinguish the best from the rest:

workmanship warranties for solar panels

Workmanship warranties

What is covered and for how long?

In the unlikely event there’s an issue with your solar panel system, it’s important to know who to call if something goes wrong. There are multiple warranties that come with your solar energy system, from manufacturer warranties for different components to workmanship warranties from your installer.

The workmanship warranty is specific to the work the installer performs, and is typically somewhere between one and 10 years. Be sure to check with your installer to see what’s included in the warranty, if there are any exclusions, and if there’s any cost to you in the event they have to come out and check on or replace some equipment.

house with solar installers and solar panels

The use of sub-contractors

Which crew will install your system?

In some instances, solar installers will rely on subcontractors to perform some, or all, of the work included during your solar installation. Don’t let this put you off: it’s entirely standard procedure in the industry. What is alarming, though, is a lack of transparency from installers about who will install your system and why they use subcontractors.

When you’ve narrowed down your list of potential solar installers, be sure to ask who will install the system–their own crew or subcontractors–and, if they use subs, ask why they do, what portion of the install the subcontractors will complete, and what oversight the company you purchase your system from has over the subcontractors. At the end of the day, the most important question is who will stand behind the quality of your installation.

solar company reviews on a computer

Expertise

How does each installer tailor their system to your needs?

Beyond ensuring that your solar installer has all of the appropriate licenses and industry-specific certifications, it’s important to work with a solar installer who has experience custom designing systems to fit their customers’ needs.

When you’re comparing your options, the best installers will work with you to understand your needs, as well as how solar fits your overall energy plans. Make sure your solar installer provides a consultative, professional solar experience, and if you’re also purchasing a solar battery system, they have proven experience with those products too.

By doing the legwork for you, EnergySage makes it easy to find reputable solar installation companies in Maine. We’ve already vetted all of our installer partners, and keep a close watch over their performance to ensure their installations and customer satisfaction are up to the levels that you–and we–expect. Start receiving free quotes from reputable installers in your area by creating an account on the EnergySage Marketplace today.

As of February 2023, the average solar panel cost in Maine is $3.38/W. Given a solar panel system size of 5 kilowatts (kW), an average solar installation in Maine ranges in cost from $14,365 to $19,435, with the average gross price for solar in Maine coming in at $16,900. After accounting for the 30% federal solar tax credit and other state and local solar incentives, the net price you'll pay for solar can fall by thousands of dollars, and with options like a solar loan, solar lease, or power purchase agreement (PPA), you can find the right payment setup for your personal needs.

According to solar shoppers on the EnergySage Marketplace, the top five solar installers in Maine are:

There are 6 solar companies in Maine on the EnergySage Marketplace.
On average, solar shoppers in Maine save $23,534 over the course of 20 years that they would have paid to their utility company. Shoppers who connect with a solar provider in Maine on the EnergySage Marketplace have a solar payback period of 11.66 years - this means that after this period of time, cumulative electric bill savings pass the upfront cost of the solar power system.
According to a study by the National Renewable Energy Laboratory (NREL), solar quotes from national installers are about 10 percent higher, on average, compared to those provided by local installers. However, if you decide a national installer is the best choice for your home solar panel installation, here are some of the biggest companies to consider: SunPower, Sunrun, Tesla, Trinity Solar, ADT Solar (formerly Sunpro), and Momentum Solar.