Kilowatt-Hours (kWh): Energy Usage Explained

Your electric bill can be a confusing mix of numbers, rates, acronyms, abbreviations, and fine print. However, the kilowatt-hour (kWh) is a universal measurement that you should know.

By understanding watts, kilowatt-hours, and your electric rate, you can gain a better grasp of your home's energy consumption and your monthly costs. Whether you’re considering home solar panels, thinking about home electrification, or just want to learn, here’s what you need to know about this basic unit of electrical measurement.

What does a kWh measure?

Kilowatt-hours are a measurement of electric power, commonly used to quantify home electricity consumption, solar energy production, or EV battery capacity in the United States. 

A kilowatt is a unit of energy equal to 1,000 watts and an hour is… well, an hour, or sixty minutes. Therefore, a kilowatt-hour is the amount of energy equal to 1,000 watts generated, transferred, or consumed over a one-hour time period. 

What is 1 kWh of electricity equal to?

To understand what 1 kWh of electricity is equal to, two key components of the equation must be considered: 

1. The electric device’s wattage
2. The run-time

For instance, if you power a 500-watt device for 1 hour, it’ll consume 500 watt-hours (or 0.5 kWh). After another hour, it will have used 1 kWh (1,000 watt-hours) in total. Likewise, a 2 kW (or 2,000-watt) device would consume 1 kWh of electricity in just 30 minutes. 

Here is a look at the wattages of typical home devices and the approximate rate at which each device would consume 1 kWh of electricity while in use.  

Note: The table above shows typical kWh consumption for home appliances and electronics. Actual kWh will vary by appliance make, model, efficiency, and age. 

Monthly electric bills and kWhs

In the US, the average home consumes approximately 900 kWh of electricity each month to power appliances, lights, and other electronics. However, consumption varies for every homeowner and is primarily impacted by the size of the home, efficiency of appliances, time of year, and ongoing energy habits.  

How many kWh per day is normal?

Since the average American home consumes around 10,800 kWh annually, roughly 29.5 kWh could be considered normal on any given day of the year. Electricity consumption is typically highest during the winter and summer months, because of the power required for heating and cooling. 

Daily kWh consumption also varies heavily by state and region, mainly driven by climate. The highest averages for home electricity use in the US can be found all across the hot and humid South, including high daily consumption rates (>35 kWh per day) in Alabama, Mississippi, Louisiana, and surrounding states.

Want to see exactly where your home's energy goes each day? The free Palmetto app breaks down your consumption in real-time and shows you simple ways to lower those kWh numbers - and your bill.

How do you calculate cost per kWh?

To calculate the kWh rate you pay for electricity, simply divide your total utility bill (minus any flat fees or taxes) by your total power consumption. The kWh rate your utility charges will also be listed somewhere on the bill. 

In some parts of the country, electricity rates will vary throughout the day, week, and year. Known as TOU rates or demand-based pricing, utilities with these cost models charge higher rates for kWh consumption during peak billing hours, which usually occur in the late afternoon and early evening. Homeowners can shift heavy electric loads from high-wattage appliances outside of peak demand hours to save a bit of money.

Average cost per kWh in the US

According to the most recent state and nationwide residential electricity rates from the US Energy Information Administration, the average cost of residential electricity was 17.24 cents per kWh in December 2025. Hawaii (41.62 cents) and California (34.71) had the highest rates. North Dakota (11.02) and Nebraska (11.57) were the states with the lowest rates. The residential electricity rate average has been steadily increasing: 13.66 cents in 2021, 15.04 in 2022, 16.00 in 2023, and 16.48 in 2024.

With rates climbing every year, tracking your daily kWh usage is more important than ever. The Palmetto app turns those confusing kilowatt-hours into clear weekly targets and actionable tips that actually lower your bill.

Solar panel kWh explained  

Just as the kWhs you purchase from the utility are charged to your electricity bill, the kWhs your solar panels produce can be credited to your account, lowering your monthly energy costs. The value at which the solar kWhs you export to the grid are redeemed will depend on the terms of your utility’s net metering or net billing structure.

Calculating solar kWh is a lot like calculating electricity consumption: The main factors are the panels’ wattage and time. Although there are many other factors that influence solar production efficiency (such as sunlight intensity and system age) you can calculate approximate solar kWh with the formula: Total System Wattage x Number of Peak Sun Hours.

So in ideal operating conditions, a 6.8 kW (6,800 watt) solar energy system will produce roughly 34 kWh of electricity daily if it receives 5 peak sun hours per day. The same set of solar panels will produce different amounts of electricity throughout the year as the sun gets stronger or weaker with the seasons. Annual solar kWh estimates are calculated during a home solar assessment.   

Learn more about how solar can transform your electric bill 

How many kilowatt-hours you can produce is one factor in determining how much you can save with solar panels. But local costs and regulations play very important roles, too. The best way to understand what you could save is to get an estimate from an installer like Palmetto. Reach out for your free savings estimate today. 

Frequently asked questions

What is a simple definition for a kilowatt-hour?

A kilowatt is 1,000 watts and a kilowatt-hour is the energy equal to 1,000 watts, produced or consumed, over one hour. 

How many kilowatt-hours does a typical home use?

In 2022, residential electric customers in the US averaged 10,791 kWh used a year, or about 899 kWh a month.

How many kWhs does an air conditioner use?

A central air conditioner with an average draw of 4,000 watts uses 1 kWh per 15 minutes of running, or 4 kWhs per hour.

How do I choose the right solar energy system for my home?

The right system for your home will depend on numerous factors, including your current electricity usage, the size and layout of your roof, and how important having backup energy is to you. Palmetto works with you to outline estimated costs, monthly savings, and long-term savings based on a system that works for your home.

Disclaimer: This content is for educational purposes only. Palmetto does not provide tax, legal, or accounting advice. Please consult your own tax, legal, and accounting advisors.