UK Energy Cost Calculator

The Ofgem energy price cap sets the maximum amount suppliers can charge per unit of gas and electricity, plus a maximum daily standing charge. It does not cap your total bill, which depends on how much energy you use. The cap is reviewed quarterly, typically changing in January, April, July, and October. Your actual bill may differ from these estimates depending on your tariff, payment method, and usage patterns throughout the year.

Smart meters give you accurate readings sent directly to your supplier, eliminating estimated bills and helping you track usage in near real-time. If you do not have one, your supplier is obligated to offer a free installation. In-home displays show your spending in pounds and pence, making it easier to identify when you are using the most energy and where savings are possible.

The biggest energy savings come from insulation, not from switching off lights. Loft insulation can save around 270 per year, cavity wall insulation around 310, and draught proofing around 125. Turning your thermostat down by just one degree saves roughly 80 annually. Using a timer so heating only runs when you need it, rather than leaving it on low all day, is also more efficient. LED bulbs use 90% less energy than traditional incandescent bulbs and last up to 25 times longer.

Switching suppliers was historically the best way to cut bills, but the price cap has narrowed differences between tariffs. However, fixed-rate deals can still be worthwhile if you expect the cap to rise. Check comparison sites regularly and remember that you have a 14-day cooling-off period after switching. Prepayment meter customers now pay the same cap rate as direct debit customers, ending years of higher charges for some of the most vulnerable households.