Electricity Cost Calculator

Your monthly electric bill may look straightforward, but it contains several components beyond just the electricity you consume. Understanding each line item helps you identify where your money goes and where you can cut costs. The primary charge is the energy charge, which is your total kilowatt-hours (kWh) consumed multiplied by your rate per kWh. But most bills also include delivery charges, customer charges, taxes, and sometimes demand charges.

The customer charge (also called a service charge or basic charge) is a fixed monthly fee that covers the cost of maintaining your connection to the grid, typically $5 to $15 per month. Delivery charges cover the cost of transmitting electricity from power plants to your home through the distribution network. These charges vary by utility but often add 2 to 5 cents per kWh on top of your generation charge. Finally, state and local taxes, renewable energy surcharges, and public benefit funds can add another 5 to 15% to your total bill.

A kilowatt-hour (kWh) is the standard unit of electrical energy used for billing. It represents the energy consumed by a device using 1,000 watts (1 kilowatt) for one hour. A 100-watt light bulb running for 10 hours uses 1 kWh. A 2,000-watt space heater running for 30 minutes also uses 1 kWh. The formula is simple:

Many utilities now offer or mandate time-of-use (TOU) rate plans that charge different prices depending on when you use electricity. The goal is to incentivize consumers to shift energy use away from peak demand periods (typically late afternoon and evening) to off-peak times when the grid is less stressed and electricity is cheaper to generate.

Demand charges are based on your highest rate of electricity consumption during a billing period, measured in kilowatts (kW), rather than total consumption in kWh. While traditionally applied only to commercial and industrial customers, some utilities are now introducing demand charges for residential customers as well, particularly those with solar panels or EV chargers.

For example, if your utility charges $10 per kW of demand and your peak usage in a month is 8 kW (say, running an AC, dryer, and oven simultaneously), your demand charge would be $80 for that month. You can reduce demand charges by avoiding running multiple high-wattage appliances at the same time. Stagger your dryer, oven, EV charger, and pool pump so they do not overlap. Some smart panels and home energy management systems can automate this load-shifting for you.

Electricity rates vary dramatically across the United States. Factors like fuel sources, grid infrastructure, state regulations, and climate all influence what you pay per kWh. Here are the rates for selected states representing the range of costs.

Knowing which appliances consume the most electricity helps you prioritize energy-saving efforts. Here is a breakdown of the biggest energy consumers in a typical American home, with annual cost estimates at the current national average rate of 18.56 cents/kWh.

Phantom loads (also called vampire power or standby power) refer to the electricity consumed by devices that are turned off but still plugged in. Chargers, game consoles, cable boxes, microwaves with clocks, and smart home devices all draw power 24/7 even when not actively in use.

The Natural Resources Defense Council (NRDC) estimates that idle electronics and appliances cost the average American home $165 per year and consume roughly 1,375 kWh annually. This is equivalent to 13% of a typical home's electricity bill being wasted on devices doing nothing. The worst offenders include cable and satellite DVR boxes (25-45W standby), game consoles (5-15W standby), and older desktop computers with monitors (5-15W standby).

To reduce phantom loads, use power strips with on/off switches for entertainment centers and computer setups. Smart power strips can automatically cut power to peripheral devices when the main device is turned off. Even the simple act of unplugging phone chargers when not in use saves a small but measurable amount. Every watt matters when it runs 8,760 hours per year.

Reducing your electricity costs does not require major lifestyle changes. These evidence-based strategies can collectively save 20 to 40% on your annual electricity bill without sacrificing comfort.