Hawaii Solar Guide 2026
Everything Hawaii homeowners need to know: costs, incentives, net metering policy, and what makes this state unique for solar.
Quick answer
Hawaii solar economics depend mainly on 5.7 average peak sun hours, an estimated $3.6/W installed cost, 38.0¢/kWh electricity, and the state's current net-metering rules.
Reviewed 2026-07-26
- Best for
- Hawaii homeowners comparing solar costs, incentives, and payback assumptions.
- Inputs needed
- annual kWh usage, utility rate, installed $/W, net-metering policy
- Formula used
- Typical production = system kW × peak sun hours × 365.
- Source checked
- state incentive data, utility tariff checks, Wattcrunch price benchmarks
Key fact about Hawaii solar
Hawaii has the highest electricity rates in the US at ~$0.38/kWh, making it the fastest solar payback state despite high install costs. The 35% state tax credit (up to $5,000) adds significant value.
Peak sun hours
5.7
hrs/day avg
Avg electricity rate
38.0¢
per kWh
Median install cost
$3.6/W
before incentives
Typical payback
6 yrs
8 kW system, avg usage
Typical 8 kW system in Hawaii
Annual production
16,644 kWh
Year-1 savings
$6,325
System cost (est.)
$28,800
No federal tax credit — Section 25D expired December 31, 2025.
Hawaii Net Metering Policy
Customer Self-Supply / Smart Export (no full retail NEM)
Hawaii ended traditional net metering in 2015. Most new systems use Customer Self-Supply (CSS) — self-consumption only, no grid export credit — or Smart Export at low fixed rates. Batteries are essentially mandatory for maximum value.
Hawaii Solar Incentives
Available in addition to any utility rebates. Federal 25D credit is $0 for homeowner-owned systems from 2026.
- ✓State tax credit: 35% of system cost (up to $5,000 per 5kW)
- ✓Property tax exemption
- ✓Sales tax exemption for solar equipment
Top Utilities in Hawaii
Interconnection timeline: 8–16 weeks (HECO approval required)
State-specific decision guide
What to verify before signing a Hawaii solar quote
In Hawaii, the financial result depends on more than sunshine or the headline installation price. Confirm the export rule, program eligibility date, and interconnection timeline for your exact utility before treating a payback estimate as a promise.
Export value
This page models customer self-supply / smart export (no full retail nem). Ask which tariff and export credit apply to your account, not only which program name appears in the proposal.
Incentive eligibility
Check equipment, income, installer, application, and placed-in-service rules before subtracting an incentive from the quote. Programs can close or change terms.
Interconnection
Budget for the published 8–16 weeks (heco approval required) and confirm who pays for a required meter, service upgrade, or engineering review.
Source trail: production assumptions use NREL PVWatts; incentive discovery should be checked against DSIRE; electricity-market context is available from the EIA. Confirm final tax treatment with the IRS and your utility.
Calculate your Hawaii solar economics
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