UK Energy Suppliers Compared

Compare the UK major gas and electricity suppliers. See ratings, tariff types, green credentials, and customer reviews for each provider.

British Gas

Big Six

British Gas is the UK largest energy supplier, part of the Centrica group. They serve around 7 million households across...

7 million customers Green: Average

Octopus Energy

Challenger

Octopus Energy is a fast-growing challenger supplier known for 100% renewable electricity, innovative tariffs, and consi...

5 million customers Green: Excellent

EDF

Big Six

EDF is a major UK energy supplier owned by the French state energy company. They are the UK largest generator of low-car...

3.5 million customers Green: Good

E.ON Next

Big Six

E.ON Next is the retail brand of E.ON UK, one of the Big Six energy suppliers. They rebranded from E.ON in 2021, focusin...

3.3 million customers Green: Good

OVO Energy

Challenger

OVO Energy is a major UK challenger supplier headquartered in Bristol. They acquired SSE Energy Services in 2020, making...

4 million customers Green: Good

Shell Energy

Big Six

Shell Energy is the UK retail energy arm of Shell plc. They acquired First Utility in 2018 and rebranded it to Shell Ene...

1.4 million customers Green: Average

Scottish Power

Big Six

Scottish Power is a Big Six energy supplier owned by Spanish utility Iberdrola. They are the only Big Six supplier to ge...

3 million customers Green: Good

Utility Warehouse

Challenger

Utility Warehouse is a multi-service provider offering energy, broadband, mobile, and insurance through a single monthly...

1 million customers Green: Average

Compare All Suppliers in Your Area

Enter your postcode to see which suppliers offer the cheapest tariffs near you.

Compare Plans

Supplier data sourced from Ofgem and Citizens Advice. Last updated April 2026.

AskUKEnergy is free to use. We may earn a commission if you switch through our links. This never affects the independence of our comparisons. Learn how we make money.