Setting up the house

Utilities on Oahu: the honest bill preview

The single budgeting fact first: Hawaii has the most expensive residential electricity in the country — routinely two to three times mainland rates. BAH is built to cover utilities, but only if you plan the house around them.

Electricity — the big line

Hawaiian Electric (HECO) serves Oahu; start service online with your lease and ID. What drives the bill is air conditioning: an older un-insulated house running window units can double a mainland family's usage cost, while a trade-wind-cooled hillside unit may barely need AC at all. At showings, ask for a recent bill (landlords who track it will tell you), check ceiling fans and window orientation, and note that many newer Ewa and Mililani homes carry solar — ask specifically whether panels are owned, leased, or PPA-bound and what conveys to a tenant. Start service through Hawaiian Electric's start, stop or move service page.

What a kilowatt-hour costs (checked October 21, 2026)

Oahu's average: Hawaiian Electric puts its 2025 average for Oahu residential (“R”) customers at 40.54¢ per kWh. That figure is total residential revenue divided by kWh sold, so it folds in fixed charges and fuel (Hawaiian Electric). At that average, every 100 kWh costs about $40.54, so a 600 kWh month would be about $243. That's arithmetic on an annual average, not a quote. Your bill depends on your usage and that month's fuel costs.
Against the mainland: the U.S. Energy Information Administration's latest monthly table (July 2026 data, released September 24, 2026) has Hawaii's statewide residential average at 48.00¢/kWh, the highest of any state, against a U.S. average of 18.31¢. That's about 2.6 times. Hawaii's July 2025 figure was 39.36¢, so this summer ran about 22% above last summer (EIA Electric Power Monthly, Table 5.6.A). The EIA figure covers every Hawaii utility, not just Oahu.
Why bills move when your usage doesn't: Hawaiian Electric says fuel is roughly 50% of a typical bill, and swings in fuel cost are the biggest driver of price changes.

Water, gas, trash

Water/sewer: Honolulu Board of Water Supply (boardofwatersupply.com) plus the city sewer charge; many rentals fold these into rent — get it in writing either way. Gas: most Oahu homes are all-electric; where gas exists it's Hawaii Gas (synthetic natural gas lines in town, propane elsewhere). Trash: city collection for houses (opala.org for schedules and rules); complexes handle their own.

Internet & mobile

Two wireline options in most pockets: Spectrum (cable) and Hawaiian Telcom (fiber where built out — coverage is address-by- address, so check both before promising a work-from-home setup). Major mobile carriers all operate; coverage dips in windward valleys and on some base interiors — ask your sponsor what works at your actual building.

Electricity40.54¢/kWh Oahu residential average (HECO, 2025); highest state average in the U.S. — plan the AC question

Water/seweroften folded into rent; confirm in writing

Gasmost homes all-electric

InternetSpectrum / Hawaiian Telcom — check the exact address

Electricity figures from Hawaiian Electric's 2025 averages and EIA Electric Power Monthly Table 5.6.A (July 2026), checked October 21, 2026. Other provider facts compiled from public utility information, mid-2026. Rates change, so verify current tariffs with each provider before budgeting. Last refreshed: August 1, 2026

Get the PCS Oahu newsletter

The PCS Oahu newsletter: one useful email when the numbers change — BAH cycle updates, rent-band refreshes, and new guides as they publish. No spam. Leave anytime.