How much does an aquarium cost per month in Rhode Island?

About $13.94 a month, assuming 150 W at a 45% duty cycle, 24 hours a day, 365 days a year at 28.29¢/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?

Rhode Island has the 7th 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 Rhode Island (July 2026 rates)

At 28.29¢ per kilowatt-hour — Rhode Island's average residential price in July 2026 — running an aquarium costs $167 a year. That is 55% more than the national average of $108. Rhode Island's residential rate is up 8.1% from July 2025, which moves this appliance from $155 to $167 a year.

Per hour: 1.9¢
Per day of use: 45.8¢
Per month: $13.94
Per year: $167

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 Rhode Island compares

Rhode Island pays 28.29¢/kWh, the 7th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $59.01 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
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
New York	29.90¢	$14.73	$177

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

What else costs about the same in Rhode Island

Gaming pc$165 a year in RI Well pump$155 a year in RI Dehumidifier$153 a year in RI

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 Rhode Island?: About $13.94 a month, assuming 150 W at a 45% duty cycle, 24 hours a day, 365 days a year at 28.29¢/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?: Rhode Island has the 7th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $108 a year.