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Best Solar Energy Companies

Profile picture of Zachary Shahan
by Zachary Shahan Solar Energy Contributing Editor

We’ve known light could be turned into electricity since 1839 when French physicist, A. E. Becquerel, discovered the photovoltaic effect. It wasn’t until the 1950s, however, that the first solar cells were available commercially, when Bell Labs produced them for use in outer space.

In the decades since, improvements in solar technology have been tremendous, as have drops in solar power cost. Since 1977, the price of solar panels has dropped approximately 100 times over, and solar power is now cheaper than power from the grid for billions of people. Many consumers are turning to solar energy to save money with this renewable energy source.

Compare Reviews for Top Solar Energy Companies

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SunLux Energy
Read 235 Reviews

Full-service solar energy provider with options to purchase, finance, pre-pay or lease for zero down. Complete system installation and lifetime customer service includes maintenance, monitoring and comprehensive 25-year warranty.

Sunrun
Read 791 Reviews

Provides loans and leases for no money down and options to prepay or purchase solar energy with installation, 10-year roof coverage and rate protection. Free maintenance, daily monitoring and 20-year insurance policy included.

Vivint Solar
Read 1603 Reviews

Offers solar energy leases and loans, along with solar panel installation, design and permitting. Plans start at $0 down and include maintenance, monitoring and a 25-year panel warranty. Systems can also be purchased outright.

SunPower
Read 248 Reviews

Home, business and global solar energy provider and system maker with purchase, loan and no-money-down lease options. Local certified installation with a 25-year complete system warranty covering power, product and service.

Solar Spectrum
Read 73 Reviews

Technology-driven solar energy provider in seven states with loan, lease and PPA options for zero down. Plans include custom digital design, installation, operation, repairs and monitoring. Leases start at $65 with 20-year terms.

Horizon Solar Power
Read 78 Reviews

Specializes in California-based zero-down solar energy PPAs and turn-key solar systems with lifetime guarantees. Free installation, maintenance and repair included. Fixed monthly rates for 20 years, with option to buy or extend.

Dividend Solar
Read 610 Reviews

Finances zero-down solar system loans in more than 25 states with installation, low or flat-fixed rates, a 10-year workmanship warranty and optional 20-year extended service plan. Storage batteries and PACE financing is available.

SolarCity
Read 545 Reviews

Nationwide residential and commercial solar panel installation specialist, now a subsidiary of Tesla that’s responsible for installing low-profile-design solar panels and solar roof tiles for use with Tesla’s home battery system.

Complete Solar
Read 184 Reviews

Partner-based business model connecting homeowners in California, Utah and New Jersey with solar energy providers and no-money-down financing options. Design, installation, permitting, maintenance and 25-year guarantee included.

PetersenDean
Read 18 Reviews

Solar contractor focused on zero-down loans for up to 20 years and multi-paneled systems including design, permitting, installation and inspection. A 25-year workmanship warranty includes roof penetration and transfer guaranty.

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What should you consider before you switch to solar energy?

Financing

In some cases, people can buy their solar power systems with cash, but with a price tag comparable to a new car.

For that reason, most people will want to consider financing. Many companies don’t make it clear there are various ways to finance your solar power system, but the difference in savings can be huge.

Our Solar Financing buyers guide covers everything you need to know about companies that can help you finance your solar purchase.

    System ownership

    Do you want to own your solar power system? Just as with a car, you have options to personally own your solar power system by purchasing it from the solar company after a certain period of time, or you may choose to lease it indefinitely.

    • Lease transfer vs. sale: If you intend to move after a few years and you have a solar lease, you will have to convince the new buyers to take over the lease – which isn’t always easy. If the solar system is already purchased, you can simply roll the cost of the system into the price of the home.
    • Lease to own: Even if you choose the leasing or purchase power agreement (PPA) route, some companies allow you to buy the system for a fair market value once the leasing period has ended.
    • Solar panel longevity: Many people don’t consider the benefits of an investment beyond 15-20 years, but it is worth noting that solar panels are very durable and can produce electricity close to the initial factory specs for many decades. Your long-term savings could be three or four times higher if you buy solar panels rather than lease them for a 20-year period.

    Costs and savings

    Just about every solar installation company has a “solar calculator” on their website to quickly estimate how much a solar system will cost and how much it will save you over time. Each solar calculator will yield very different estimates, so compare as many as possible and feel free to ask each company what factors they’ve used to come up with their estimates.

    • Electricity costs: Calculators may estimate electricity costs in different ways. Numbers can be based on the national average, regional averages, or based on information you provide – and each input can result in very different overall cost and savings estimates.
    • Incentives: Calculators may or may not include federal, state and local incentives which, if you’re eligible, can mean big savings.
    • Generation potential: Some calculators take a satellite photo of your roof and offer a close estimate of how much electricity you can generate. Some calculators use your regional solar irradiation to create the estimate, while other calculators simply use the size of your roof or your typical electricity consumption with no other factors included.
    • Financing assumptions: Cost calculators also make different assumptions regarding financing (for instance, whether you'll use a flat-rate cash purchase, a lease, a loan or PACE financing). Your actual cost will vary if you choose a different financing method.

    Equipment

    There are many different solar panels on the market – each with their own benefits and disadvantages. Solar panels used for the rooftop solar market are less varied, but there are still considerable differences between each brand.  Find out which manufacturer's solar panels the company installs.

    • Price vs. efficiency: The biggest price differences among solar panel brands generally reflect variations in efficiency, but efficiency doesn’t usually matter unless you have very limited space on your roof.
    • Warranties and reliability: How reliable are the chosen company’s panels known to be – and is the company likely to be around in 10 years? Will they guarantee the panels and service them if they become faulty?
    • Options: Does the installer give you a choice between different types of panels, or at least disclose where the panels are manufactured?

    Additional services

    Does the company offer service beyond installation? Some companies only install solar panels, while other companies manage every aspect of the process, including servicing them regularly and replacing parts as needed.

    • Maintenance and warranties: Some solar companies will install the solar panels, provide maintenance and offer warranties on both the panels and the work. These additional services may come at a cost, but it is often worth it.
    • Financing: Some companies will even assist you during the financing process, whether that be a lease, loan, or PACE financing. Check to see whether you will save money by financing through the solar panel company, or if it would be a better financial decision to seek financing elsewhere, such as through a home improvement loan from your bank.
    • Incentives: Some companies help you find and take advantage of incentives you may be eligible for on the federal, state and local levels, such as tax breaks or rebates.
    • Manufacturing: A number of solar installers also manufacture the solar panels and solar cells they use.

    Customer service

    Some companies have dedicated customer service representatives available to help you with any questions or problems. Others will refer you to an automated 1-800 number for everything.

    • Dedicated salesperson: Your solar company may provide a dedicated salesperson or customer service representative from day one or after a certain stage in the process – or maybe not at all.
    • Post-sale: Ideally, your initial point-of-contact will be available if you need something after sales, but you may be assigned to a different representative at a later time.
    • Service fees: There’s a good chance premium services will also come with an additional cost, but there should be no fee for asking questions.

    What are the different types of solar panels?

    Crystalline solar panels

    Crystalline solar energy panels make up the majority of solar panels used for residential solar power. Crystalline silicon is the semiconducting material used in solar electric technology to produce solar cells. These solar cells are then built into solar panels. The purity of the crystalline silicon determines how efficient a solar panel is.

    Monocrystalline solar panels

    Monocrystalline solar energy panels are the most efficient panels on the market.They produce the highest power outputs and require the least amount of space when compared with other panels (15-20 percent efficiency rating). They have the longest lifespan of any panel on the market. Most companies warrant them for around 25 years.

    Polycrystalline solar panels

    Polycrystalline solar energy panels cost less than monocrystalline panels because the process to make them is simpler and less expensive. They’re less efficient than monocrystalline panels (13-16 percent efficiency rating). You will need to cover a larger surface area with polycrystalline panels to get the same amount of power as you would from a monocrystalline panel system.

    Thin-film solar panels

    Thin-film solar energy panels are made by layering thin solar cells on materials such as glass, metal or plastic. They are cheaper to manufacture than crystalline-based panels, so they’re easy to mass-produce.They can be made flexible, and are therefore used for multiple applications. High temperatures and shading don’t affect them as much as other panels, and they’re great for wide open spaces like farms and fields. Since thin-film panels require a lot of space, they’re not ideal for residential use. They also degrade faster than crystalline panels.

    Who should switch to solar power?

    Homeowners

    A large percentage of homeowners would benefit financially from going solar, but only a tiny percentage have made the switch. Residential solar installations have grown exponentially, and as more people see friends and family go solar, the number of installations continues to grow. Falling solar costs also make the offer enticing to more and more homeowners. Homeowners wanting to switch to solar may be limited by options offered in their particular state, as some solar companies do not operate nationwide.

    Small and large businesses

    Small and large businesses that switch to solar can save on energy costs while making a big statement about helping the environment. Solar power is often cheaper than electricity from the grid, making solar a logical (and even obvious) option for businesses. Many large companies such as Walmart, IKEA, Google, Facebook, Apple, Kohl’s and Walgreens have begun transitioning to solar on a large scale in recent years. In certain areas, PACE financing may be available for building owners.

    Government agencies and nonprofits

    Government agencies and nonprofit organizations are not able take advantage of very useful tax incentives, but solar companies that offer innovative financing options can help these organizations switch to solar as well. Dropping solar costs have made solar power a financially-beneficial option in some locations – even without any tax incentives.

    Cash and loan consumers

    Individuals or organizations that benefit from (or prefer to) purchase their solar power systems may have limited options. Some companies simply don’t offer the option to pay upfront for the solar system, or may only allow customers to purchase the system after a certain period of time. Those who choose to purchase their systems are usually looking for a long-term energy solution and are comfortable taking responsibility for the maintenance of their solar panel system.

    Leasing and PPA customers

    Many consumers don’t have thousands of dollars laying around to purchase their own solar system, so they’ll need to explore financing options that will make it possible. Some solar companies (or states) simply won’t offer solar leasing or PPAs, and others will offer these options but could tend to push consumers towards a different financing option instead. Solar lease or PPA payments will typically be lower than current utilities, so these customers will notice a cash savings right away and usually won’t have to bother with the maintenance of a leased solar system.

    DIY solar users

    Solar panel systems can be extremely durable and require little to no maintenance. Those who plan to install and maintain their own solar system may have a different set of criteria in choosing a solar company. If you plan to install and service the system yourself, you’ll likely need to purchase the system with cash or with a loan, as companies who offer solar leases and PPAs are more likely to require installation and even maintenance to be handled by their company or a partner company.

    Solar beginners

    Many consumers wanting to switch to solar have little to no experience with solar systems. Choosing a company that offers both installation and maintenance services is likely the best route for those who want more of a hands-off solar experience.

    Expert reviews about solar companies

    Dividend Solar

    Dividend Solar is a solar financing company that began in San Francisco. Its mission is to give investors a way to invest in solar and to provide homeowners another source of financing. Basically, through crowd-sourced investments, a homeowner can get a competitive loan to cover the cost of a rooftop solar system.

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    Vivint Solar

    The #2 residential solar installer in the United States, Vivint Solar is a public solar company that launched in 2011.

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    SolarCity

    SolarCity is by far the largest residential solar installation company in the United States. It is also one of only a few companies vertically integrated, offering installation and financing while also including a manufacturing arm.

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    Solar Five

    Solar Five is a Massachusetts-based company providing affordable solar energy to homeowners, businesses and government. Solar Five manages the installation process from start to finish for an easy transition to solar power. They have completed over 400 solar energy projects of all sizes and can customize a solar package to meet every consumer’s needs.

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    Sunrun

    In business for over 10 years, SunRun services more than 100,000 customers in 22 states. The company specializes in customized solar energy systems and offers a lifetime warranty on its products.

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    SunLux Energy

    SunLux Energy has over 20 years of experience in installing quality solar energy systems and components. Understanding switching to renewable solar energy can be expensive, It focuses on helping consumers save money but pinpointing their properties exact energy needs. Whether you’re a homeowner wanting to make the switch to renewable energy or a Californian commercial property or business owner, SunLux Energy will work with you to develop a system to meet your properties needs.

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    Solar Spectrum

    Sungevity was one of the first solar installers to offer solar leasing, but it is not tied to that financing model. It uses a unique, efficient, satellite-based system for providing customers with an initial solar quote.

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    GreenMind Energy

    GreenMind Energy got its start in 2015 and offers customized solar power solutions to consumers in Vermont, Rhode Island, Connecticut, New York, New Jersey, Utah and California. GreenMind Energy evaluates each client's personal property to customize a solar system that is right for their home. It prides itself on putting the customer first by including them in every step of the process, from selecting panels to the designing the system.

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    SunPower

    SunPower is one of the world’s leading solar cell and solar module manufacturers, and it’s also a leading solar installer. It was one of the first solar companies to become vertically integrated, and was the first U.S. company focused on the home solar market to do so. Aside from residential solar installations, SunPower is routinely one of the top commercial solar panel installers in the United States.

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    RGS Energy

    RGS Energy is part of Real Goods Solar and sold some of the first solar panels to the public, over 35 years ago! Real Goods Solar was the 5th-largest residential solar installer in the U.S. in 2013.

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    Complete Solar

    Complete Solar is a company devoted to designing and installing residential solar power systems. The company offers a range of services, and much of its success comes from a proprietary technology that helps clients choose specific features while staying within their budgets.

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    PetersenDean

    PetersenDean is a residential and commercial roofing and solar company founded in 1984. It entered the solar market relatively recently, but is the #1 residential roofing contractor in the U.S., with over 1 million roofs installed.

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    REPOWER America

    Founded in 2008, REPOWER by Solar Universe has been around for several years yet pursued a different business model than most of its peers – franchising.

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    Yingli Solar

    In 2012 and 2013, Yingli Solar held the title as the #1 solar module manufacturer in the world in terms of annual solar module capacity sales.

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    Horizon Solar Power

    As one of the leading providers of solar power installation in Southern California, Horizon Solar Power is dedicated to offering residential homes a renewable energy system at discount pricing. Their unique take on solar installation helps more homes reap the benefits of solar energy without the high cost of panels.

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    Go Solar

    Go Solar, Inc., is a Colorado-based and Colorado-focused full-service solar company. It has partnered with high-quality US-based companies to offer great solar products made in the USA.

    • Supports the US economy: Focused on supporting the U.S. economy, Go Solar, Inc. uses solar panels and solar inverters from top U.S. solar companies such as SunEdison and Enphase.
    • Industry knowledge: The company’s leadership knows solar technology and solar financing in depth, which leads to a high-quality product offering and competitive financing options.
    • High-quality industry partnership: With SunEdison as a dedicated partner, Go Solar, Inc., presumably gets a good deal on its solar panels, thus allowing the company to offer customers a good deal on high-quality solar technology (which includes a 25-year warranty).
    • Complete service: Go Solar, Inc. keeps the customer experience smooth and pleasant with in-house contractors, financing, maintenance, monitoring and even roof repair (with a 20-year “bumper to bumper” warranty).
    • Mutual benefit with growth: The company also offers a $500 reward for referring new customers.
    • Best for: homeowners, small and large businesses, government agencies and nonprofits, cash and loan consumers, leasing and PPA customers and solar beginners.
    Crius Solar

    Verengo Solar was the #3 residential solar installer in 2013 in terms of residential market share. The company has installed over 12,000 residential solar power systems, however, the company is reportedly up for sale.

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    Pick My Solar

    Pick My Solar is a unique solar company that is focused on assisting homeowners who want to go solar. It collects bids from various solar installers, evaluates them and makes recommendations to the homeowners.

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    Tesla Energy

    Tesla Energy Solar Power has been providing alternative sources of energy since 2015. Tesla Energy offers solar solutions for both businesses and residences. Tesla has partnered with Sunworks to build a solar-driven community that provides affordable, clean energy to clients all over the world. Tesla Energy Solar power is based in Sacramento, California.

    • Tesla solar panels: Tesla solar panels have a low-profile design that blends into your roof. These sleek panels show no mounting hardware to give them a clean, integrated look.
    • Tesla Powerwall: The Tesla Powerwall stores energy that the solar panels capture for use during natural disasters and power outages. These compact backup power sources integrate with Tesla solar.
    • Tesla solar roof: Tesla started production on solar roofs in 2017. These roofs are made entirely of solar panels, and they come in four different options: smooth, textured, tuscan and slate.
    • Commercial and government products: Tesla offers solar energy solutions for commercial and government organizations. Tesla provides panels and Powerpack energy storage for municipalities, schools, enterprises, agriculture and more.
    • Utilities: Tesla designs solar energy solutions for power grids. Tesla’s centralized solar power generators provide clean, renewable energy storage.
    • Best for: residences and businesses interested in investing in solar power solutions.

    Compare Reviews for Top Solar Energy Companies

    Solar Five
    Read 22 Reviews

    Provides residential and commercial solar energy ownership and lease options on the East Coast with installation, monitoring, 20-year system warranty and five-year workmanship guarantee. Rooftop and ground systems available.

    Crius Solar
    Read 12 Reviews

    Offers comprehensive solar energy service, including design, planning, permitting and installation. $0 down loans and PPAs available. Plans include repair, monitoring and insurance for 20 years.

    EnergySage
    Read Reviews

    Nationwide cost-comparing network gathering competitive offers from pre-screened installers in an online solar marketplace. Customers can request and compare competing quotes and research solar financing across 30-plus states.

    Pick My Solar

    Online hub matching users with solar manufacturers, financiers and certified installers who competitively bid on projects. Triple-coverage guarantee includes production, workmanship warranty and system’s manufacturer warranty.

    REPOWER America
    Read Reviews

    Specializes in residential rooftop installation of solar systems through a network of contractors in 14 states. Clients are paired with a local provider and presented with equipment and financing options, including loans and PPAs.

    RGS Energy
    Read 27 Reviews

    Full-service solar provider offering installation and zero-down financing in 10 states. Systems can also be purchased outright. Design, permitting, inspection and 25-year warranties included. Service and maintenance available.

    Yingli Solar

    Global solar panel manufacturer offering planning, designing, installation and maintenance through a local provider. Panels come with a 10-year product warranty and 25-year output guarantee. Purchasing options vary by provider.

    Go Solar
    Read Expert Review

    Based in colorado, Go Solar is dedicated to making quality solar products that are made in the USA. The company offers both residential and commercial solutions.

    Tesla Energy
    Read Expert Review

    Designs and installs solar panels and roof shingles with options to buy, finance or lease systems for no money down. Monitoring, maintenance and insurance available. Systems include a 20-year warranty. Home batteries available.

    GreenMind Energy
    Read Reviews Out of Business

    Headquartered in Fitchburg, Massachusetts, GreenMind Energy services multiple states with solar energy solutions. It focuses on putting its customer’s needs first by walking them through each step of becoming a solar household.

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    Profile picture of Zachary Shahan
    Zachary Shahan Solar Energy Contributing Editor

    Zachary Shahan is the director of CleanTechnica, and his key areas of focus are solar energy and electric vehicles. He has been referenced or interviewed by essentially every major media organization as a recognized global thought leader on solar energy.