How much does an aquarium cost per month in Colorado?

About $8.44 a month, assuming 150 W at a 45% duty cycle, 24 hours a day, 365 days a year at 17.13¢/kWh.

How many kilowatt-hours does an aquarium use?

Roughly 591 kWh a year under these assumptions, or 0.07 kWh for every hour it runs.

Is that expensive compared with other states?

Colorado has the 23rd most expensive average residential rate in the country, so this appliance costs less here than the U.S. average of $108 a year.

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Cost to run an aquarium in Colorado (June 2026 rates)

At 17.13¢ per kilowatt-hour — Colorado's average residential price in June 2026 — running an aquarium costs $101 a year. That is 7% less than the national average of $108. Colorado's residential rate is up 6.8% from June 2025, which moves this appliance from $94.84 to $101 a year.

Per hour: 1.2¢
Per day of use: 27.8¢
Per month: $8.44
Per year: $101

Assumption: 150 W at a 45% duty cycle, 24 hours a day, 365 days a year — 591 kWh a year. A 55-gallon tank: heater, filter and light combined, averaged over a day. Use the calculator to swap in the numbers from your own model.

How Colorado compares

Colorado pays 17.13¢/kWh, the 23rd most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $7.15 less a year than the typical U.S. household pays for the same use. Running the same aquarium costs $77.52 a year in Nevada and $312 in Hawaii, so where you live changes this bill by $234 a year.

State	Rate	Per month	Per year
Georgia	16.36¢	$8.06	$96.74
Alabama	16.40¢	$8.08	$96.97
Colorado	17.13¢	$8.44	$101
Virginia	17.22¢	$8.49	$102
Indiana	17.51¢	$8.63	$104

States ranked by average residential price, cheapest first. See all 51 states for an aquarium.

What else costs about the same in Colorado

Gaming pc$100 a year in CO Well pump$93.79 a year in CO Dehumidifier$92.50 a year in CO

Cutting the number down

The heater is nearly all of it, and its runtime depends on the room. A tank in a cool room costs more to keep warm.
Insulating the back and sides of the tank cuts heater runtime without changing the view.
A lid limits evaporative heat loss, which is the main way an open tank sheds the warmth you paid for.

Questions

How much does an aquarium cost per month in Colorado?: About $8.44 a month, assuming 150 W at a 45% duty cycle, 24 hours a day, 365 days a year at 17.13¢/kWh.
How many kilowatt-hours does an aquarium use?: Roughly 591 kWh a year under these assumptions, or 0.07 kWh for every hour it runs.
Is that expensive compared with other states?: Colorado has the 23rd most expensive average residential rate in the country, so this appliance costs less here than the U.S. average of $108 a year.