The breakthrough underscores Octopus’ extraordinary trajectory driven by technology, innovation and customer-centricity, cementing its place as one of the world’s fastest-growing energy suppliers

In less than a decade, Octopus has risen from a tech challenger to the largest energy supplier in the UK, whilst branching out into new markets and industries. It operates a £7 billion renewables portfolio – one of the largest in Europe – as well as thriving EV leasing, heat pump and solar businesses.

Its retail presence now spans eight countries across Europe, Asia and North America – the UK, Germany, Spain, France, Italy, Japan, the US and New Zealand – with several international markets on track to hit one million customers by 2027.

TIME Magazine has named Octopus Energy one of the world's ‘100 Most Influential Companies’.

Greg Jackson, Founder of Octopus Energy, said: “It’s very rare for a startup to overtake incumbents in regulated markets, and I’m proud that we did that in the UK and are now accelerating across so many countries. I’m even more proud that we have 4.8/5 Trustpilot across almost every market we operate – proving our brand has universal appeal – and our relentless focus on customers transcends national regulatory and cultural differences.

“I’m excited that we continue to innovate at this scale, and that we are continually unlocking new value on windy days, sunny days, high demand days and using solar, battery, heat pump and electric cars to keep driving down costs.”

UK: rise to the top

Octopus is the first energy supplier to overtake the incumbents and hit the UK’s number one spot since the market was opened for competition in the 1990s, now serving 7.8 million customers. It is the most awarded energy supplier in the UK, winning top industry accolades for customer service, value, and sustainability while maintaining a Trustpilot rating of 4.8. Recognised by consumer body Which? for 8 consecutive years, Octopus also ranks on The Sunday Times’ ‘Best Places to Work’ list.

Octopus’s Kraken technology platform has allowed over a dozen acquisitions to be managed seamlessly – rapidly delivering Octopus’s service and experience to millions more customers.

Germany: the second biggest market

Germany is Octopus’ second-biggest market, now powering over 1 million German homes – a landmark achievement that makes it the first country outside the UK where Octopus has achieved this feat. Following the successful launch of its heat pump installation business and over £200 million injected into the German ‘Energiewende’, it's now shaking up the automotive industry. In September, Octopus Electric Vehicles was launched in Germany to power the switch to electric driving.

France: the trusted alternative

The newcomer has quickly become France’s fifth-largest energy supplier and the largest independent alternative provider. Octopus is trusted by nearly 600,000 French domestic and business customers, including the cities of Paris, Marseille and Lyon. It also holds the highest Trustpilot score among energy suppliers in the country (4.8), reflecting its commitment to service excellence and green energy solutions.

Italy: award-winning growth

Octopus has seen similar growth in Italy, tripling its customer base in just one year. The company now boasts almost 500,000 customers across the country. It won ‘Best Provider’ twice from consumer association Altroconsumo, secured an outstanding TrustPilot score of 4.9 and was recognised as the energy supplier with the best customer service by major daily newspaper Corriere della Sera for 2024 and 2025.

Spain: unlocking the power of the sun

In Spain Octopus supplies over 400,000 customers and is recognised as the 'Fastest-growing Independent Energy Supplier' by the National Commission for Markets and Competition and ‘Best Energy Supplier according to Spanish Consumers’ by IMA Marketing. Its services business has seen dazzling growth since its launch in 2023, installing more than 8,000 solar panels, EV chargers and heat-pumps per year. On top of this, the company has announced new investments that will add up to 600 MW of renewable capacity – enough to power 2.3 million homes.

Japan: driving growth through local partnerships and technology

Japan has rapidly become one of Octopus Energy’s fastest-growing markets, now powering nearly half a million customers with green electricity nationwide through a joint venture with Tokyo Gas. Between 2022 and 2024, the company saw more than 10x growth, outpacing every other company in Japan's top 40 energy suppliers, according to METI. This success is grounded in a culture of trust, transparency and autonomy – earning the company a place as one of the best places to work by the Great Place To Work® Institute Japan.

Octopus has not only brought its award-winning service to customers around the world, it has also pioneered tech-led innovations that are driving green energy and bringing bills down for people. Its flagship offerings include:

• Electroverse: Europe’s largest EV public charging network with 1.1 million chargers across 40 countries
• The Fan Club: a smart tariff that gives people discounted electricity when their local wind turbine is spinning, now available in the UK, Germany, France and Texas
• Zero Bills: an initiative guaranteeing homes no energy bills for 5-10 years, with 5,000 homes already accredited across the UK, Germany and New Zealand and a target of 100,000 by 2030