Is Solar Worth It in Hawaii?
Hawaii averages 42¢/kWh for electricity and 1500 kWh of annual production per kW installed. On the illustrative system below, that means payback in about 3 years.
Illustrative system, identical in every state so they're comparable: 8 kW at $3/watt ($22,000 gross), 30% incentives, 0.5% annual degradation, 3% annual utility rate increase, over 25 years. Only the electricity rate and solar production change between states. Install prices vary by installer and market — use the calculator with your real quote.
Why Hawaii lands where it does
Two things decide solar payback almost entirely: what you pay for grid electricity, and how much sun your roof gets. Everything else — install cost, degradation, incentives — adjusts the result at the margins.
| Hawaii | National avg. | |
|---|---|---|
| Electricity rate | 42¢/kWh | 16¢/kWh |
| Production per kW | 1500 kWh/yr | 1300 kWh/yr |
| Year 1 savings | $5,040 | $1,664 |
| Effective cost of solar | 5.4¢/kWh | 6.3¢/kWh |
| Payback period | 3 yrs | 8.4 yrs |
| 25-year net gain | $156,421 | $41,328 |
By far the best solar economics in the country — excellent sun combined with electricity rates roughly triple the national average. Grid saturation means storage is often required.
The number that actually matters
Your solar electricity effectively costs 5.4¢/kWh — the net system price spread across the 282,671 kWh it will generate over 25 years. Set that against the 42¢ you currently pay Hawaii's utilities. Every kWh the system produces saves you about 36.6¢, which is where the $156,421 of lifetime gain comes from.
Use your real quote. Open the Solar Payback Calculator pre-filled with Hawaii's electricity rate and sun — then enter the actual system size and price you've been quoted.
What this page doesn't tell you
There are no Hawaii incentive amounts or net-metering terms here, deliberately. Those change with legislative sessions and utility rate filings, and a stale figure could cost you real money. The 30% used above is a placeholder you should replace with what you actually qualify for.
Net metering deserves particular attention: what your utility pays for exported power varies enormously and has been getting less generous in several states. If your utility credits exports well below retail, lifetime savings will be lower than shown here unless you consume most of your production directly or add storage.
A projection, not a quote. Electricity rates are state averages and vary by utility, plan, and season; production is a statewide approximation that ignores roof orientation, tilt, and shading. Excludes maintenance, inverter replacement, and net-metering structure. General information, not financial advice.
Related calculators
- Solar Payback Calculator — the full model, every assumption editable
- Solar System Size Calculator — what size you actually need
- Solar Loan vs Cash — what financing really adds
- EV Charging Cost — charging off your own production
Frequently asked questions
Is solar worth it in Hawaii?
On an 8 kW system at $3 per watt, solar in Hawaii pays back in roughly 3 years and returns about $156,421 over 25 years. That is a strong result — driven by 42¢/kWh electricity and 1500 kWh of annual production per kW installed.
How much does electricity cost in Hawaii?
The average residential rate in Hawaii runs about 42¢/kWh, far above the national average of roughly 16¢. Your rate is the single biggest driver of solar payback — the more expensive your utility, the more each kWh your panels make is worth. Check your own bill rather than relying on a state average, especially in deregulated markets.
How much solar power can I generate in Hawaii?
Roughly 1500 kWh per year for each kW of panels installed, which is far above the national average of about 1300. An 8 kW system would produce around 12,000 kWh in its first year. Roof orientation, tilt, and shading move this substantially — NREL's free PVWatts tool gives a site-specific estimate.
What is the effective cost per kWh of solar in Hawaii?
About 5.4¢/kWh — the net system cost divided by everything it produces over its life. Compare that against the 42¢ you currently pay: every kWh the system makes saves you roughly 36.6¢.