Who is the best energy supplier in the UK?

Octopus Energy is the top-rated supplier, achieving the highest overall score of 74% in Which?'s 2025 survey, with nearly nine in 10 customers satisfied and willing to recommend it. Octopus has overtaken British Gas as the UK's largest energy provider with 24.6% market share, and maintains an impressive 4.8-star Trustpilot rating.

Is Octopus cheaper than British Gas?

Yes, Octopus Energy typically offers better value. Octopus consistently prices its tariffs below the energy price cap and sets its standing charges significantly lower than British Gas.

Which energy source is best for the UK?

The UK needs a diverse energy mix for reliable, affordable, and clean power. Renewables reached a record 47% of UK electricity generation in 2025, overtaking gas at 28% and nuclear at 11%.

Is OVO the worst energy supplier in the UK?

OVO ranks among the poorest performers. OVO received the lowest customer satisfaction score of 56% in Which?'s 2025 survey, with customers expressing strong dissatisfaction regarding value for money and communication.

Which energy supplier has the most complaints?

Large suppliers including British Gas, OVO and Octopus have the highest complaint rates, with over 1,400-2,000 complaints per 100,000 customer accounts.

When should I switch energy suppliers?

You should switch energy suppliers when your contracts end, if you're on an expensive standard tariff, or when you find significantly cheaper deals. Typically, switching can save £200-400 annually.

Can I switch energy supplier with debt?

Switching with debt is usually possible if you owe under £500 on prepayment meters. For larger debts, you may need to arrange payment plans before switching.