What is kW vs kWh?
Plain-English explanation from a licensed Utah HVAC, plumbing, and electrical contractor.
kW (kilowatt) is a rate of power — how fast you're using electricity right now. kWh (kilowatt-hour) is a quantity of energy — what you actually get billed for, based on how long that power flowed.
Full Definition
A kilowatt (kW) is a unit of instantaneous power equal to 1,000 watts. A kilowatt-hour (kWh) is a unit of energy equal to using 1 kW for 1 hour. Your home's hourly demand might be 3 kW; if it ran that hard for a full hour you'd consume 3 kWh. Rocky Mountain Power bills Utah residential customers per kWh consumed, with a small fixed monthly customer charge.
When sizing solar systems, evaluating EV charging costs, or comparing appliance energy use, the kW/kWh distinction matters. A 3.3 kW Level 2 EV charger consumed over 8 hours uses 26.4 kWh — about $2.50–$3.00 at Utah residential rates depending on time-of-use plan.
Common Questions
How much does it cost to run my AC for an hour in Utah?
A typical 3-ton SEER2 16 system draws 2.2–2.8 kW. At Rocky Mountain Power's ~$0.11/kWh tier-2 summer rate, that's $0.24–$0.31/hour — roughly $50–$75 per month if it runs 8 hours/day.
What's a typical Utah home's kWh use?
Utah residential average is about 750 kWh/month, varying widely with electric heat (1,500+ kWh) vs. gas heat (550 kWh average) and AC usage.
Related Terms
EV Charger
A Level 2 EV charger is a 240-volt circuit and wall-mounted unit that adds 20–40 miles of range per hour of charging — about 5x faster than the 120V Level 1 cord that ships with most EVs.
Main Electrical Panel
The main panel (or 'service panel,' 'load center,' 'breaker box') is the central electrical distribution point in your home — where utility power comes in, is metered, and is divided into the individual circuit breakers that protect each room and appliance.
Recent ELECTRICAL work in Utah
A few installs and service calls from the AYSP crew.
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