Hawaiian Electric Co. customers on Oahu saw electric bills bump up $3.07 in the new year due to higher fuel prices.

The bill for an Oahu household using 500 kilowatt-hours is $135.39, or 25 cents a kilowatt-hour this month. In December the bill was $132.32, or 24.4 cents a kilowatt-­hour.

The increase was due to higher oil prices as well as the island’s coal facility delivering less energy to the electrical utility, said Jim Kelly, HECO vice president of corporate relations.

“On Oahu, bills rose slightly due to an uptick in oil prices, and the AES Hawaii power plant, the cheapest source of power on the island, was undergoing maintenance work and running at only partial capacity,” Kelly said.

AES Hawaii, a coal-fired facility in Kapolei, is one of eight independent power producers that feed HECO’s fuel mix. Combined, the eight facilities provide half of the energy HECO uses.

January marks the third straight month of increases, following two months of minor reductions in electricity prices. The price of power in Hawaii is double the average of electricity prices across the nation.

Hawaii residents paid an average of 27.54 cents a kilowatt-hour in October. The national average was 12.54 cents in the same month, according to the latest figures from the U.S. Energy Information Administration.

Hawaii has the highest electrical rates in the nation, largely due to the state’s use of imported oil for most of its power. Other states use a mix of energy resources such as natural gas, hydroelectric power, coal or nuclear power.

Hawaii is the most petroleum-dependent state, spending $5.4 billion on the fuel source in 2014, according to the EIA.

In 2015 HECO’s energy mix was roughly 71.1 percent oil on Oahu. HECO imports oil primarily from Southeast Asia and the Middle East.

The only neighbor island to see a reduction on electricity bills in January was Hawaii island.

The residential rate for Hawaii Electric Light Co. customers on Hawaii island was $163.27, or 30.3 cents per kilowatt hour, down from $164.41, or 30.6 cents per kilowatt-hour, in December.

Some Maui Electric Co. customers saw a nearly $7 increase.

The average bill for a Maui household using 500 kilowatt-hours is $146.59, or 27.4 cents per kilowatt-­hour. In December the average bill was $139.41, or 26 cents per kilowatt-hour.

MECO customers on Molokai using 400 kilowatt-hours of electricity are paying an average of $137.11, or 31.8 cents per kilowatt-hour. In December it was $135.75 with a rate of 31.5 cents a kilowatt-hour.

Lanai residents using 400 kilowatt-hours of electricity on the island are paying $139.67, or 32.5 cents a kilowatt-hour. In December, Lanai residents paid $142.33, or 33.2 cents a kilowatt-hour.

Bills on Lanai and Molokai are provided based on electricity use at 400 kilowatt-hours. This is due to lower energy use compared with Maui, the Big Island and Oahu, HECO said.

HECO, MECO and HELCO monthly bills include the cost for kilowatt-­hours used plus other charges.

The Kauai Island Utility Cooperative decreased its rate to 32.77 cents per kilowatt-hour in January. In December the rate was 33.23 cents per kilowatt- hour. The typical bill for a household using 500 kilowatt-hours in January, including a $10.58 customer base charge, is $174.43.