US residential solar · 2026 data

Solar Panels in Hawaii

Q: "How much do solar panels cost in Hawaii in 2026?"

"The average installed cost runs between $3.00 and $3.30 per watt in 2026. For a typical 5.5 kW system, that's roughly $16,500–$18,000 before incentives. After applying Hawaii's RETITC state tax credit of up to $5,000, most homeowners net out between $11,500 and $13,000. Larger systems of 8–9 kW on Oahu can cost $25,000–$29,000 before the credit is applied."

Q: "Is the federal solar tax credit still available in Hawaii in 2026?"

"No. The federal 30% Investment Tax Credit was eliminated for new residential installations starting January 1, 2026. Homeowners who completed installation in 2025 can still claim it when filing taxes. For 2026 installations, only Hawaii's RETITC — worth 35% of system cost, capped at $5,000 — applies. This change adds roughly $5,000–$6,000 to the effective net cost compared to a 2025 installation."

Q: "What is Hawaii's RETITC solar tax credit?"

"Hawaii's Renewable Energy Technologies Income Tax Credit covers 35% of the total installed cost of a residential solar PV system, capped at $5,000 per system. It applies in the tax year of installation, and any unused portion carries forward for up to five years. The credit covers both panels and battery storage when installed together, though the $5,000 cap applies to the combined system total."

Q: "Does Hawaii still have net metering?"

"Traditional net metering ended in Hawaii. New residential solar customers join net billing programs under Hawaiian Electric — primarily the Customer Grid-Supply Plus plan — which credits exported power at $0.10 to $0.18 per kWh, far below the retail rate of $0.40/kWh. Maximizing self-consumption, ideally with a battery, is the core strategy for strong solar economics in Hawaii."

Q: "How long does it take for solar panels to pay for themselves in Hawaii?"

"For a typical 2026 installation using only the state RETITC, payback runs 6–8 years for most households. Hawaii's electricity rate of $0.40/kWh accelerates payback significantly compared to most mainland states. After breakeven, the system continues producing savings for 17–19 more years within its 25-year warranty, often totaling $40,000 or more in lifetime bill reductions. *Data sources: U.S. Energy Information Administration (EIA) Electric Power Monthly, February 2026; NREL (National Renewable Energy Laboratory) residential battery storage data via Lawrence Berkeley National Laboratory Tracking the Sun report; EnergySage Hawaii solar market data, March 2026; Hawaii Department of Taxation RETITC program guidelines (HRS §235-12.5); Hawaii State Energy Office incentive database.*"

SAVE

$0+

Over 25 Years

$12,600 Cost after ITC

4.6 yrs Payback

6.0 kW Typical system

Most homeowners need:

13–17 panels typical
6.0 kW average system
$12,600 after tax credits
4.6 year payback

✓ Updated monthly ✓ NREL data ✓ Reviewed by solar experts ✓ IRS tax credit included

Updated June 9, 2026 · 9 min read ·By Mark Sullivan ·Reviewed by Green Energy Calculators Editorial Team

Calculate My Savings View Hawaii Solar Data

Without solar vs with solar

25-year cost comparison for a $300/month US electric bill.

Without solar

25-year utility cost

$115,100

Rates rise ~3% per year (EIA avg.)

With solar

Net system cost

$12,600

After 30% federal ITC

Your savings

Difference

+$102,500

Estimated lifetime advantage

Author Mark Sullivan

Reviewed by Green Energy Calculators Editorial Team

Last updated Jun 9, 2026

Sizing formula kW = Annual kWh ÷ (Peak Sun Hours × 365 × 0.82)

Hawaii homeowners pay the highest residential electricity rates in the United States — around $0.40 per kWh as of early 2026, according to the U.S. Energy Information Administration (EIA), compared to a national average of roughly $0.18. That single fact drives most of the solar math in the Aloha State. Every kilowatt-hour your panels generate is worth more than twice what it saves a homeowner in a mainland state, which is why solar payback periods in Hawaii are among the shortest in the country.

The typical Hawaii homeowner installing solar in 2026 is looking at a gross system cost between $15,000 and $28,000 before incentives, depending on island, system size, and roof complexity. After applying the state’s Renewable Energy Technologies Income Tax Credit (RETITC), that net figure falls meaningfully — and for homeowners who pair their panels with battery storage, the financial case gets even stronger. The state’s grid export program no longer pays retail rates for surplus power, which shifts the smart strategy toward self-consumption rather than selling back to Hawaiian Electric.

This guide covers everything Hawaii homeowners need to make an informed decision: what solar actually costs on each island, which incentives are still available in 2026, how the current net billing rules affect your savings, and what a realistic payback period looks like for your household.

What Solar Panels Actually Cost in Hawaii in 2026

Installation costs in Hawaii vary more by island than in almost any other state. On Oahu, EnergySage data from early 2026 puts the average system price at around $3.11 per watt, with a typical 9.3 kW system running roughly $28,900 before incentives. The Big Island tends to come in slightly higher per watt at around $3.66/W, while statewide averages cluster around $3.00–$3.30/W depending on the data source.

System size is the biggest lever on total cost, and Hawaii is unusual in that residents use far less electricity than the national average. According to the EIA, the average Hawaiian household consumes around 509 kWh per month — less than 60% of the 863 kWh national average. That relatively low consumption means most households need a system in the 5–8 kW range, which keeps total installation costs lower than you might expect from the per-watt price alone. A 5 kW system in Honolulu typically runs around $15,500 before incentives; an 8 kW system lands closer to $25,000.

Bar chart comparing Hawaii solar system costs by size in 2026, from 5 kW to 9.3 kW — **Hawaii Solar Panel Cost by System Size (2026)** A 5 kW system costs roughly $15,500 before incentives, while a 9.3 kW system on Oahu averages $28,900. Source: EnergySage Hawaii market data, March 2026.

The cost breakdown follows a familiar pattern: panels and inverters account for roughly 25–50% of the total, with labor, permitting, and interconnection fees making up the rest. Island-specific permitting requirements, the salt-air environment near coastlines, and Hawaii’s strict building codes can add cost compared to mainland states. Roof type matters too — flat or low-pitch roofs common on older homes sometimes require additional racking hardware that pushes the final price upward.

Getting at least three quotes from licensed Hawaii installers is strongly advisable — pricing variation across companies can exceed 20% for equivalent equipment. Use the solar system size calculator to estimate what size system your household needs based on actual monthly usage before collecting installer quotes.

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Hawaii Solar Incentives Still Available in 2026

The landscape of solar incentives shifted materially at the end of 2025. The federal 30% Investment Tax Credit (ITC), which had been available under the Inflation Reduction Act, was eliminated for new residential installations beginning January 1, 2026. For anyone who completed their installation in 2025 or earlier, the credit still applies when they file their taxes — but new installations in 2026 do not qualify. On a $20,000 system, that federal credit had been worth $6,000, so its absence is a meaningful change in the math. To apply this credit correctly, start with a firm figure from our guide to How Much Do Solar Panels Cost in 2026? Complete US.

Hawaii’s RETITC (Renewable Energy Technologies Income Tax Credit) remains in place and is genuinely valuable. The credit covers 35% of the total installed cost of a solar PV system, up to a maximum of $5,000 per system. For a typical 5.5 kW system costing around $16,500, that means a $5,000 state tax credit — the maximum available. Unused credit can be carried forward for up to five years if your state tax liability doesn’t cover it in year one.

Beyond the RETITC, Hawaii homeowners benefit from several additional financial protections. There is no general statewide sales tax on solar equipment, which reduces upfront costs compared to states like California or Arizona where sales tax applies to solar purchases. Most counties — including the City and County of Honolulu — provide a property tax exemption for solar energy improvements, meaning your annual property tax bill won’t rise even as your home’s value increases. Honolulu’s exemption lasts 25 years.

For lower-income households, the Green Energy Money Saver (GEMS) program provides on-bill financing at around 5.5% interest for up to 20 years, with no large upfront payment required. You can model your potential state tax savings before committing using the solar tax credit calculator to project different net costs under Hawaii’s current incentive structure.

How Hawaii’s Net Billing Rules Affect Your Solar Savings

Traditional net metering — where excess solar sent to the grid earns a full retail-rate credit — ended in Hawaii years ago. What exists now is a net billing system that credits exported power at rates well below what you pay to buy electricity. Under Hawaiian Electric’s current Customer Grid-Supply Plus (CGS+) program, export credits range from roughly $0.10 to $0.18 per kWh, depending on the island and time of day. The retail rate you pay to buy power back sits at $0.40 or higher — meaning exported energy earns less than half what it costs to replace.

That gap fundamentally changes how a Hawaii solar system should be designed and operated. Exporting power to the grid and buying it back later is an economically poor trade. The winning strategy is maximizing self-consumption — using your solar power directly as it’s generated, shifting energy-intensive tasks like laundry and dishwashers to daylight hours, and storing excess generation in a battery for evening use rather than exporting it.

Some homeowners on newer plans are enrolled in a self-supply program that doesn’t allow grid exports at all. Those systems are sized to match — but not exceed — the home’s daily consumption, so nothing goes to waste in an unfavorable export transaction. Hawaii locks export credit rates in place for seven years from the installation date, which provides some financial predictability even if the rates are lower than retail.

For comparison, states like Oregon and Washington still offer far more generous net metering policies with full retail-rate credits. Hawaii’s solar economics remain strong despite the weaker export terms — but only when the system is properly sized for self-consumption from the start. The solar net metering calculator can model how different export credit rates affect your long-term savings under Hawaii’s current billing structure.

Why Battery Storage Makes Strong Financial Sense in Hawaii

No state in the country has a higher residential battery storage attachment rate than Hawaii, according to Lawrence Berkeley National Laboratory research cited by NREL. The economics push strongly toward pairing panels with storage, and the resilience case — grid outages, storm vulnerability, island energy independence — makes battery backup particularly compelling here compared to mainland states.

Without a battery, a solar-only system exports a significant portion of its afternoon generation to the grid at $0.10–$0.18 per kWh. With a battery, that surplus stays in the home and powers the evening hours when panels are no longer generating, avoiding grid purchases at $0.40/kWh. The difference adds up to hundreds of dollars annually in avoided electricity costs.

A Tesla Powerwall 3 or comparable 13–15 kWh battery runs roughly $10,000–$14,000 installed in Hawaii in 2026. That’s a real upfront cost, but the self-consumption savings meaningfully reduce the net burden over time. Hawaiian Electric’s Battery Bonus Program — which paid $850 per kW of storage capacity — closed to new applicants in mid-2024. However, batteries installed alongside solar still qualify for the Hawaii RETITC state tax credit, though the combined credit for panels and storage together is capped at $5,000 total.

Batteries also provide resilience value that’s hard to price but easy to appreciate. Hawaii’s island grids are more vulnerable to extended outages than most mainland utilities, and a battery-backed solar system keeps critical loads — refrigerator, medical equipment, lighting — running through disruptions without a gas generator. The strong combination of $0.40/kWh retail rates, weak export credits, and genuine outage risk makes Hawaii the most compelling battery market in the country.

Solar Payback Period and Long-Term Savings in Hawaii

With the federal tax credit removed from the equation for 2026 installations, payback periods have lengthened compared to 2024–2025. A typical scenario looks like this: a 5.5 kW system installed for $16,500, with the $5,000 RETITC applied, nets to an out-of-pocket cost of about $11,500. At Hawaii’s average electricity rate and assuming the system covers 80–90% of household consumption, annual electricity bill savings run roughly $1,500–$2,100. That implies a payback period of 6 to 8 years for most homeowners, with the system warrantied for 25 years.

After payback, those savings continue accumulating. Over a full 25-year panel lifespan, EIA data suggests Hawaii homeowners with solar can save $40,000 or more on electricity costs, depending on system size and how rates evolve. Hawaii’s electricity prices have risen roughly 50% over the past decade, and there is little structural reason to expect that trend to reverse given the state’s continued reliance on imported petroleum for backup power generation.

For comparison, states with similar sunshine hours but far lower electricity rates — like Florida or New Mexico — typically see payback periods of 10–14 years, which illustrates how much Hawaii’s high utility rates compress the solar breakeven timeline. Solar also consistently increases home resale value. A properly installed system with favorable export terms locked in at installation is a quantifiable asset that buyers recognize and will pay a premium for. If you’re planning to sell within the next 5–10 years, that added home value partially compensates for the longer payback period in a pre-sale scenario.

Run a full projection tailored to your household using the solar savings calculator before making a final decision on system size, battery pairing, or installer selection.

Solar vs utility company · 25-year comparison

Total cost of staying on the grid vs owning solar for a $300/month bill (national average assumptions).

Total utility payments

$115,100

Total solar cost (after ITC)

$12,600

Net savings

+$102,500

Avg. monthly difference

+$228/mo

See my savings →

Frequently asked questions

Direct answers for US homeowners in Hawaii.

How much do solar panels cost in Hawaii in 2026?

The average installed cost runs between $3.00 and $3.30 per watt in 2026. For a typical 5.5 kW system, that's roughly $16,500–$18,000 before incentives. After applying Hawaii's RETITC state tax credit of up to $5,000, most homeowners net out between $11,500 and $13,000. Larger systems of 8–9 kW on Oahu can cost $25,000–$29,000 before the credit is applied.

Is the federal solar tax credit still available in Hawaii in 2026?

What is Hawaii's RETITC solar tax credit?

Does Hawaii still have net metering?

How long does it take for solar panels to pay for themselves in Hawaii?

Hawaii solar by electric bill

See system size and payback for common monthly bills in Hawaii.

$200 $200/month electric bill Panels · cost · payback → $300 $300/month electric bill Panels · cost · payback →

View Hawaii solar data & incentives →

Popular utility companies

Solar rules and net metering vary by utility — not just by state.

Hawaiian Electric Oahu Maui Electric Maui County Hawaii Electric Light Big Island Kauai Island Utility Kauai HECO CGS+ / Self-Supply Net billing programs GEMS on-bill financing State program

Methodology & data sources

Calculation method: System size uses NREL PVWatts derate factor (0.82). Costs based on SEIA 2026 installed cost ($2.75–$3.20/W). Payback uses net cost after 30% federal ITC (IRC Section 25D). Savings assume full-retail net metering unless noted.

Official sources: EIA state electricity rates · NREL PVWatts · Energy.gov ITC guide · DSIRE incentives · SEIA market data · IRS Publication 5695.

All figures are estimates for educational purposes — not tax, legal, or investment advice. Consult a licensed installer and CPA for your situation.