Honolulu Solar Overview
Honolulu and Oahu have the most compelling solar economics in the United States. Hawaiian Electric's rates are the highest in the nation—often 3-4x the mainland average—making solar an obvious choice for nearly every homeowner. Hawaii leads the country in rooftop solar adoption for good reason.
Hawaiian Electric Programs
Net Energy Metering Evolution
Hawaii's net metering programs have evolved significantly:
- Original NEM: Closed to new customers (grandfathered systems exist)
- Customer Grid Supply (CGS): Export-only program at lower rates
- Customer Self-Supply (CSS): No export allowed; batteries required
- Smart Export: Time-varying export compensation
Current Program Options
| Program | Export Credit | Best For |
|---|---|---|
| Customer Self-Supply | None (no export) | High self-consumption + battery |
| Smart Export | Time-varying | Battery storage systems |
| Customer Grid Supply | ~$0.10-0.15/kWh | Grid-tied without battery |
Hawaii Solar Incentives
State Incentives
- Hawaii state tax credit: 35% of system cost (one of the best!)
- No sales tax: Hawaii has no sales tax
- Property tax exemption: Solar doesn't increase property taxes
- 100% renewable goal: State committed to 100% clean energy by 2045
Federal Tax Credit (2026 Update)
| Purchase Type | Federal Credit | Notes |
|---|---|---|
| Cash/Loan Purchase | None (25D expired) | Ended Dec 31, 2025 |
| PPA/Lease | 30% (48E) | Through Dec 2027 |
Hawaii state credit offsets federal loss: Hawaii's 35% state tax credit partially compensates for the expired federal credit, making purchased systems still attractive.
Costs & Savings in Honolulu
Typical System Costs
| Configuration | Gross Cost | After HI Credit (35%) |
|---|---|---|
| 7 kW Solar Only | $24,000-28,000 | $15,600-18,200 |
| 7 kW + Battery | $36,000-42,000 | $23,400-27,300 |
| 10 kW + Battery | $48,000-55,000 | $31,200-35,750 |
Savings Estimates
- Annual production: ~1,350 kWh per kW installed
- Self-consumed value: $400-500+ per kW/year
- Payback period: 3-6 years (even after federal credit loss)
- 25-year savings: $60,000-100,000+
Why Batteries Matter in Hawaii
Battery storage is more important in Hawaii than almost anywhere else:
Battery Benefits in Hawaii
- Program eligibility: Some programs require battery (CSS)
- Self-consumption: Store daytime solar for evening use
- Export value gap: Self-consumed power worth 2-3x export credit
- Grid stability: Helps Hawaiian Electric manage solar saturation
- Backup power: Hurricane and storm resilience
The Bottom Line
Honolulu has the best solar economics in America. Sky-high electricity rates, Hawaii's 35% state tax credit, and excellent sunshine create 3-6 year payback periods—even without the federal credit. If you own a home in Honolulu, solar is almost certainly worth it.
Battery strongly recommended: Hawaiian Electric's program structure and the gap between retail and export rates make battery storage highly valuable. Solar + battery maximizes your savings and provides hurricane resilience.
Best candidates: Virtually every Honolulu homeowner with a suitable roof. The economics are so compelling that solar pays back faster than almost any other home improvement investment.
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