Your electricity bill usually includes usage charges, a daily supply charge, and sometimes fees, discounts or solar feed-in adjustments. Check whether the plan uses a flat, time-of-use or demand tariff, as your costs can depend on when and how much electricity you use. Compare the estimated annual cost for your household rather than relying only on the advertised cents-per-kilowatt-hour rate, and read the conditions for discounts and price changes. You can use the government-backed Energy Made Easy website where available, then confirm details with the retailer before switching.