Retail Electricity and Natural Gas Markets Observatory, Q4 2025 (CRE)

Summary

• The residential electricity market reached 35.02 million sites at 31 December 2025, up 93,000 in Q4.p.3
• Regulated tariff (TRVE) customers fell by 210,000 to 19.54 million sites.p.3
• In natural gas, 46.9% of residential consumers had a contract with an alternative supplier.p.3
• Alternative electricity suppliers gained 556,000 customers in 2025, against 509,000 in 2024.p.4
• Historic suppliers gained 319,000 market-offer customers in 2025, against 508,000 in 2024.p.4
• 3.79 million of 5.39 million non-residential electricity sites are on market offers, or 70%.p.5

Key insights

1. TRVE market share fell from 58.0% to 55.8% in 2025.p.4
2. Alternative suppliers' electricity share rose from 30.4% to 31.8%.p.4
3. Historic suppliers' market offers rose from 11.6% to 12.4%.p.4
4. TRVE sites fell by 637,000 in 2025, versus 752,000 in 2024.p.4
5. Alternative suppliers' gas share rose from 45.6% to 46.9%.p.4
6. The number of offers priced below the TRVE rose from 36 to 47.p.7