How much does an aquarium cost per month in New Hampshire?

About $13.11 a month, assuming 150 W at a 45% duty cycle, 24 hours a day, 365 days a year at 26.60¢/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?

New Hampshire has the 8th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $108 a year.

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Cost to run an aquarium in New Hampshire (July 2026 rates)

At 26.60¢ per kilowatt-hour — New Hampshire's average residential price in July 2026 — running an aquarium costs $157 a year. That is 45% more than the national average of $108. New Hampshire's residential rate is up 16.7% from July 2025, which moves this appliance from $135 to $157 a year.

Per hour: 1.8¢
Per day of use: 43.1¢
Per month: $13.11
Per year: $157

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 New Hampshire compares

New Hampshire pays 26.60¢/kWh, the 8th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $49.02 more a year than the typical U.S. household pays for the same use. Running the same aquarium costs $75.21 a year in Louisiana and $284 in Hawaii, so where you live changes this bill by $209 a year.

State	Rate	Per month	Per year
New Jersey	25.19¢	$12.41	$149
District of Columbia	25.21¢	$12.42	$149
New Hampshire	26.60¢	$13.11	$157
Rhode Island	28.29¢	$13.94	$167
Alaska	28.83¢	$14.21	$170

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

What else costs about the same in New Hampshire

Gaming pc$155 a year in NH Well pump$146 a year in NH Dehumidifier$144 a year in NH

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 New Hampshire?: About $13.11 a month, assuming 150 W at a 45% duty cycle, 24 hours a day, 365 days a year at 26.60¢/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?: New Hampshire has the 8th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $108 a year.