Does Hawaii charge a demand charge on EV charging?

Yes — Schedule P bills $32.04 per kilowatt-month on Oahu and $29.44 on Maui, flat year-round on the monthly peak, alongside flat energy rates near 34–38¢/kWh. The EV-specific pilot rate that nearly eliminates the demand charge is capped and expires March 2027, so the model carries the standard schedule.

How is Hawaii's general excise tax modeled?

Three ways: 4.5% on hardware, 4.5% on the installation contract including labor, and 4.5% of gross charging receipts as an operating cost under the absorbed reading — about $20,000 a year at default revenue. An operator who passes the GET to drivers as a separate receipt line sees near-zero operator-side cost, and every field is editable.

Which islands does the model cover?

Oahu (HECO Schedule P) and Maui (MECO Schedule P) — the islands with open Superchargers. The Big Island row is researched at current rates and ships when the permitted Kona and Hilo sites open; Kauai is cooperative territory with no Superchargers and shows a named-utility notice.

ForgeAsset / Supercharger ROI / Hawaii

Tesla Supercharger ROI in Hawaii

Hawaii is the most expensive power market in the covered set by roughly a factor of two: the bundled Schedule P rates on Oahu (33.8¢/kWh flat plus $32.04 per kilowatt-month) and Maui (38.0¢ plus $29.44) are oil-fired at the margin, and the fuel rider alone exceeds most mainland rows' entire bundled rate. Each island is its own grid with its own tariff book — the model covers Oahu (HECO) and Maui (MECO), with the Big Island row researched and waiting on its permitted sites to open. Hawaii's tax system is equally distinctive: no property tax on equipment anywhere, but a 4.5% general excise tax that reaches gross charging receipts and the full installation contract.

Model a Hawaii site

What makes Hawaii economics distinct

The fuel rider is the fastest clock in the set

Hawaii's energy cost rider resets monthly — Oahu's factor moved three cents per kWh in two months in 2026, about ±9% of the bundled rate. Base rates barely move (Hawaii runs performance-based regulation, not conventional rate cases), so the modeled rows are re-derived from the utility's monthly effective-rate summary, and the second five-year PBR period re-prices all three territories from January 2027.

An EV rate exists that halves the bill — and expires

Hawaiian Electric files Schedule EV-P, a large-demand EV pilot at $4.00 per kilowatt with time-of-use energy shaped around midday solar, which roughly halves the monthly bill against Schedule P at model load. It is capped at 500 accounts across all territories and closes March 2027 — inside year one of any modeled project — so the model carries the standard rate and treats EV-P and its successor docket as documented upside.

The general excise tax reaches everything — except property

Hawaii's GET stands in for a sales tax and an entity tax at once: 4.5% on imported hardware's landed value, 4.5% on the full installation contract including labor, and 4.5% on gross charging receipts, carried in the model as a revenue line under the absorbed reading (operators may instead pass up to 4.712% to drivers as a receipt line). Against that: no county in Hawaii taxes business equipment at all, and entity costs are $15 a year.

The newest clean-fuels law in the country

Hawaii signed Act 258 in July 2026 — a Clean Fuel Standard with rulemaking due by January 2028 and program start in 2029, targeting 10% carbon-intensity reduction by 2035. Whether charging electricity generates credits awaits the rules, making Hawaii the most concrete future credit-revenue watch in the covered set. Today the modeled credit line is $0.

Utilities and tariffs modeled in Hawaii

Utility & tariff	Energy	Demand
Hawaiian Electric Schedule P	33.8¢/kWh flat	$32.04/kW of monthly peak
Maui Electric Schedule P	38.0¢/kWh flat	$29.44/kW of monthly peak

Rates are digit-verified against each utility's own filed sheets and update within two weeks of any revision. Full derivations are on the methodology page.

Hawaii tax profile

Sales tax on hardware: 4.5%
Business personal property tax: none
Clean-fuels credit: no program
Per-kWh charging excise: none

Hawaii tax defaults applied: no clean-fuels credit revenue exists yet (the LCFS line is $0) — Hawaii signed a Clean Fuel Standard into law in July 2026 with rulemaking due by 2028 and a program start in 2029, the most concrete future credit line in the covered set. Hawaii's general excise tax stands in for both a sales tax and an entity tax: 4.5% applies to imported hardware and to the full installation contract including labor, and 4.5% of gross charging receipts is carried as a revenue-tax line under the absorbed reading — an operator who passes the tax to drivers as a separate line (up to 4.712%) sees near-zero operator-side cost, and both fields are editable. No business personal property tax exists anywhere in Hawaii, LLC costs are $15 per year, and no per-kWh charging tax exists — Hawaii's EV instrument is a per-mile road-usage charge on the driver. The utility revenue taxes are already inside the filed rates.

Hawaii programs and incentives

Hawaii Energy EV Charging Station rebates

DCFC rebates of $35,000 per new station ($28,000 replacement), funded from the petroleum barrel tax. As of mid-2026 the program is awaiting additional state funding — applications are accepted and paid when funding arrives; a won rebate enters the model through the grant inputs.

NEVI (federal, HDOT-administered)

Hawaii's five-year allocation is small — on the order of $17–18 million statewide — administered by HDOT across the island corridors.

Hawaii charging market

Hawaii's Supercharger footprint is roughly five open sites: four on Oahu (Aiea, Kaneohe, Honolulu's Waikiki International Marketplace, and the Kahala Resort — about 50 stalls) and Kahului on Maui, with a Wailea site approved. The Big Island's permitted Kailua-Kona and Hilo sites are in development — the HELCO row ships when they open. Kauai's cooperative hosts no Superchargers and is not covered. Each island is one utility: no boundary seams, no municipal patchwork.

Hawaii Supercharger ROI — questions

Does Hawaii charge a demand charge on EV charging?: Yes — Schedule P bills $32.04 per kilowatt-month on Oahu and $29.44 on Maui, flat year-round on the monthly peak, alongside flat energy rates near 34–38¢/kWh. The EV-specific pilot rate that nearly eliminates the demand charge is capped and expires March 2027, so the model carries the standard schedule.
How is Hawaii's general excise tax modeled?: Three ways: 4.5% on hardware, 4.5% on the installation contract including labor, and 4.5% of gross charging receipts as an operating cost under the absorbed reading — about $20,000 a year at default revenue. An operator who passes the GET to drivers as a separate receipt line sees near-zero operator-side cost, and every field is editable.
Which islands does the model cover?: Oahu (HECO Schedule P) and Maui (MECO Schedule P) — the islands with open Superchargers. The Big Island row is researched at current rates and ships when the permitted Kona and Hilo sites open; Kauai is cooperative territory with no Superchargers and shows a named-utility notice.

Sources

Model a Tesla V4 Supercharger site in Hawaii — payback, NPV, IRR, and a 15-year cash flow from your own inputs.

Run a Hawaii scenario

Other states: California, North Carolina, Georgia, Oregon, Pennsylvania, Florida, Arizona, Texas, Virginia, Illinois, Michigan, Tennessee, Montana, Idaho, Kansas, Nebraska, North Dakota, South Dakota, Wyoming, New Mexico, Oklahoma, Alabama, Missouri, Wisconsin, Iowa, Indiana, Louisiana, Nevada, Washington, Ohio, Utah, New Hampshire, Kentucky, South Carolina, Massachusetts, Minnesota, New Jersey, Colorado, Maryland, Arkansas, Mississippi, West Virginia, Alaska, Washington, DC, Maine, Delaware. Coverage spans forty-six states and the District of Columbia in total — see the full list.

ForgeAsset is software, not investment, tax, or legal advice — outputs are model estimates from your inputs, not guarantees. Rates and programs current as of research; verify current terms with each source before committing capital.