There's no single "most" sustainable solar company, as it depends on criteria, but REC Group, SunPower, Canadian Solar, and Trinasolar consistently rank high for using recycled materials, low-carbon manufacturing (hydroelectric for REC), ethical sourcing, and end-of-life recycling programs (PV Cycle). Australian innovators like SunDrive (copper cells) and Tindo (local manufacturing) also focus on sustainability.
The "best" solar company in Australia depends on what you value, but top-rated installers in 2025 include RESINC Solar, praised for customer service and quality by SolarQuotes and Canstar; Solargain, noted for high satisfaction; and companies like Jet Solar, PSW Energy, and Koala Solar receiving high customer ratings on SolarQuotes.com.au. Top panel brands often mentioned are SunPower Maxeon, REC, Longi, and Jinko Solar, known for efficiency and strong warranties.
Orica crowned Australia's most sustainable company for Impact. The explosives manufacturer is recognised for completing the biggest emissions abatement project in the Australian chemicals sector, as it takes out the 2024 Sustainability Leaders award.
We've ranked 10 of the most sustainable brands taking real action.
Our Top Solar Company Picks
The "20% rule" for solar panels is a sizing guideline suggesting you install a system that generates about 20% more energy than your average daily usage, creating a buffer for cloudy days, lower sunlight, system inefficiencies (like inverter losses), and future energy needs. This means designing your system to produce around 120% of your typical consumption (e.g., 1200 kWh for 1000 kWh usage), ensuring more reliable power and maximizing value without significantly overspending, though regulations might cap this oversizing.
Tongwei Solar
In August 2023, Tongwei became the first solar company to make the Fortune Global 500 list, and as of March 2025, makes $594 million (£460 million) in annual profit. Tongwei has also stated that its 54 solar farms in China have cut the country's carbon footprint by 3.3 million tons.
Once again, Schneider Electric received the top spot on the 2025 list of the World's Most Sustainable Companies by TIME and Statista. This list aims to set a benchmark for other businesses and encourage the integration of sustainability into core corporate strategies.
5 Cs: Conservation | Commerce | Community | Culture | Consciousness.
The report assesses the progress of all 193 UN Member States on the SDGs. As in previous editions particularly the Nordic countries, top the 2025 SDG Index. Finland ranks first, followed by Sweden and Denmark.
The "Big Three" energy companies in Australia, dominating the residential electricity and gas markets, are AGL Energy, Origin Energy, and EnergyAustralia, serving a significant portion of customers nationwide and driving much of the industry's direction, though facing challenges from smaller competitors and the energy transition. These providers offer extensive plans, balancing traditional generation with increasing renewable energy investments and facing scrutiny over market share and sustainability efforts.
Which? Eco Providers for 2024: Ecotricity, Good Energy and Octopus Energy
Australia is a place of great natural beauty, home to many species found nowhere else on Earth. But it's also particularly vulnerable to introduced animals, diseases and weeds. Habitat destruction, pollution and climate change make matters worse.
There isn't one single "biggest" solar company, as it depends on the metric (installations, revenue, specific tech), but Sunboost is a leader in volume, while companies like National Solar Energy Group (NSEG), Esteem Energy, and Smart Energy (for batteries) are major players, alongside global manufacturers like JinkoSolar, offering significant reach in the Australian market for installations and supply.
A 6.6kW solar system in Australia generally costs between $5,000 to $9,000 installed for a quality system without a battery, with averages often around $6,000-$7,000 after the federal STC rebate, depending on component quality (panels, inverter) and installer. Adding a battery can add $4,000 to $8,000+, bringing total costs to $9,500 - $14,000+, while premium systems might be higher, but cheaper, lower-quality options exist.
Getting started with the 7Rs: Rethink, Refuse, Reduce, Reuse, Repair, Regift, Recycle.
The framework utilizes five interconnected dimensions—Economy, Ecology, Equity, Ethics, and Esthetics—to ensure a comprehensive evaluation that moves beyond purely financial or environmental metrics.
Reduce, Reuse, Recycle.
Which company ranked #1 in 2025? Schneider Electric secured the top spot, recognised for its Net Zero roadmap, renewable energy transition, and circular economy strategy. When and where was the list announced? The Top 250 was unveiled on 9 September 2025 at Sustainability LIVE London, live from the BizClik TV stand.
John Elkington has been described as “the godfather of sustainability”. He has co-founded four companies, including Volans, where he is described as Chairman and Chief Pollinator. He is the author of 20 books including Green Swans: The Coming Boom in Regenerative Capitalism.
SolarCity was founded in 2006 by South African brothers Peter and Lyndon Rive, based on a suggestion for a solar company concept by their cousin, Elon Musk, who was the chairman and helped start the company. By 2009, solar panels it had installed were capable of generating 440 megawatts (MW) of power.
China. China dominates the solar energy sector, producing 77.8% of the world's solar panels and possessing 393GW of solar capacity in 2022. According to the International Energy Agency (IEA), China built more solar panels in 2023 than the entire world did in 2022.