2026 · No Federal Tax Credit · NREL + EIA Data
Solar Panels in Hawaii: Cost, Payback & ROI (2026)
Is solar still worth it in Hawaii after the 30% federal tax credit expired? These pre-computed estimates use NREL PVWatts production data and current 38.5¢/kWh Hawaii electricity rates for a typical home using 900 kWh/month.
Section 25D (30% federal solar tax credit) expired December 31, 2025
All numbers below reflect 2026 math with no federal residential credit. State incentives, where applicable, are noted in the section below.
Hawaii Solar at a Glance
Based on a 900 kWh/month home ($347/mo electric bill at 38.5¢/kWh), 100% offset, no state rebate applied.
6.2 kW
For 900 kWh/month home
$18,206
At $2.95/W (LBNL 2024 avg)
4.2 years
Without state rebate
$4,158
Estimated annual savings
$132,970
Cumulative before rebate
$114,764
Savings minus system cost
38.5¢/kWh
very high vs. 16.0¢ U.S. avg · EIA 2025
1,750 kWh/kW/yr
excellent · 5.4 peak sun hrs/day · NREL PVWatts
Is Solar Worth It in Hawaii in 2026?
Hawaii's electricity rates are the highest in the nation at 38.5¢/kWh — more than double the U.S. average — making solar the most financially compelling in any state. Even with HECO's Smart Export program paying well below retail for excess production, most homeowners see payback in 5–7 years. Battery storage is nearly always worth adding in Hawaii given the rate structure and limited export value.
For a typical Hawaii home consuming 900 kWh per month, our calculation shows a 6.2 kW system needed for 100% offset. At the current national average installed cost of $2.95/W (LBNL Tracking the Sun 2024), that's $18,206 gross before any state rebates. Year-one savings of $4,158 grow each year as electricity rates escalate — the model assumes 2.5%/year (EIA AEO 2024).
The 4.2 years payback period is excellent — well below the national average of 8–12 years. Over 25 years — the standard warranty period for most premium panels — a Hawaii homeowner following this profile would save an estimated $132,970 total, for a net benefit of $114,764 after recovering the system cost.
Year-by-Year Savings Snapshot: First 10 Years
Based on 6.2 kW system, 0.5%/yr degradation, 2.5%/yr rate escalation, no state rebate.
| Year | Production (kWh) | Annual Savings | Cumulative |
|---|---|---|---|
| Year 1 | 10,800 | $4,158 | $4,158 |
| Year 2 | 10,746 | $4,241 | $8,399 |
| Year 3 | 10,692 | $4,325 | $12,724 |
| Year 4 | 10,639 | $4,411 | $17,134 |
| Year 5✓ Paid off | 10,586 | $4,499 | $21,633 |
| Year 6 | 10,533 | $4,588 | $26,221 |
| Year 7 | 10,480 | $4,679 | $30,900 |
| Year 8 | 10,428 | $4,772 | $35,672 |
| Year 9 | 10,375 | $4,867 | $40,539 |
| Year 10 | 10,324 | $4,964 | $45,503 |
System cost to recover: $18,206. Table shows savings without state rebate applied. Use the interactive calculator to enter your actual bill and any rebate.
Solar Incentives in Hawaii (2026)
Hawaii does not have a state solar income tax credit (it expired), but high rates alone justify investment. The state exempts solar equipment from general excise tax.
- GE tax exemption on solar equipment
- Property tax exemption on added home value
- HECO's Smart Export program (below-retail export rates)
- Demand response programs for battery storage
Incentive programs change frequently. Verify current offerings at dsireusa.org or directly with your utility before making any purchasing decision.
How We Calculate Hawaii Solar ROI
These estimates use the same methodology as our interactive solar ROI calculator, applied to Hawaii-specific data:
System cost
$2.95/W installed
LBNL Tracking the Sun 2024
Solar production
1,750 kWh/kW/yr
NREL PVWatts v8
Electricity rate
38.5¢/kWh
EIA Residential Rates 2025
Rate escalation
2.5%/year
EIA Annual Energy Outlook 2024
Panel degradation
0.5%/year
NREL (Jordan & Kurtz, median)
System lifetime
25 years
Standard warranty period
No Section 25D (federal residential solar credit) is included — it expired December 31, 2025. State incentives are not reflected in these pre-computed figures; use the interactive calculator to enter specific rebate amounts.
Calculate With Your Actual Numbers
The figures above use statewide averages. Enter your actual monthly bill, any Hawaii rebate amounts, and your offset target in our interactive calculator for a personalized estimate.
Frequently Asked Questions — Solar in Hawaii
Compare Other States
Estimates are based on NREL PVWatts v8 production data, EIA 2025 electricity rates, and LBNL 2024 installed cost benchmarks. Actual savings vary by roof pitch, shading, utility rate structure, and local permit costs. This is not financial advice. Consult a licensed solar installer before making any purchasing decision.