How much does an aquarium cost per month in South Dakota?

About $7.57 a month, assuming 150 W at a 45% duty cycle, 24 hours a day, 365 days a year at 15.36¢/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?

South Dakota has the 19th cheapest 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 South Dakota (June 2026 rates)

At 15.36¢ per kilowatt-hour — South Dakota's average residential price in June 2026 — running an aquarium costs $90.82 a year. That is 16% less than the national average of $108. South Dakota's residential rate is up 8.0% from June 2025, which moves this appliance from $84.08 to $90.82 a year.

Per hour: 1.0¢
Per day of use: 24.9¢
Per month: $7.57
Per year: $90.82

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 South Dakota compares

South Dakota pays 15.36¢/kWh, the 19th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $17.62 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
Arizona	15.18¢	$7.48	$89.76
Wyoming	15.24¢	$7.51	$90.11
South Dakota	15.36¢	$7.57	$90.82
West Virginia	15.45¢	$7.61	$91.36
South Carolina	15.55¢	$7.66	$91.95

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

What else costs about the same in South Dakota

Gaming pc$89.70 a year in SD Well pump$84.10 a year in SD Dehumidifier$82.94 a year in SD

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 South Dakota?: About $7.57 a month, assuming 150 W at a 45% duty cycle, 24 hours a day, 365 days a year at 15.36¢/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?: South Dakota has the 19th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $108 a year.