Compare estimated annual costs using your household’s actual usage, rather than relying on the headline discount or cents-per-kilowatt-hour rate. Check the supply charge, time-of-use rates, contract terms, late-payment or exit fees, and whether discounts depend on paying on time or by direct debit. If you have solar, compare feed-in tariffs alongside electricity rates, as a higher export rate may not offset higher usage costs. Review the retailer’s offer and fact sheet, and use an official comparison service or contact the retailer to confirm details for your address.