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Plug-in solar in Hawaii

Not yet — Hawaii's bill stalled in 2026

  • A plug-in solar bill was introduced in 2026 but stalled
  • Reintroduction expected in the 2027 session

Last verified

Status
Bill stalled
Bill
—
Signed
—
Effective
—
Size cap
—
Avg. electricity rate
48.00¢/kWh (+162% vs US)

800 W kit · typical year

$530saved

Payback ≈ 1.7 yrs · ranks #1 of 51 for savings

Hawaii lawmakers introduced plug-in solar legislation in 2026, but it stalled before final passage. Bill trackers expect it to be reintroduced in 2027.

Until a law passes, plugging a generating device into home wiring isn't covered by a specific legal framework in Hawaii, and your utility may treat it as an unauthorized interconnection.

What plug-in solar is worth in Hawaii

Hawaii households pay an average of 48.00¢ per kWh, 162% above the US average of 18.31¢. With roughly 5.5 peak sun hours a day, here is what a well-placed system produces and saves. We assume panels facing south at about 30°, 86% system efficiency and 80% of output used on-site.

800 W kit (2 panels)

Saved per year
$530
Payback ($900 kit)
1.7 yr
Energy used
1,105 kWh/yr
25-year net
$12,359

1,200 W kit (max)

Saved per year
$796
Payback ($1,300 kit)
1.6 yr
Energy used
1,657 kWh/yr
25-year net
$18,589

Run your own numbers

Change the orientation, mounting and size to match your balcony.

800 W
80%

Plug-in systems aren't net-metered: surplus sent to the grid earns nothing. ~80% is typical without a battery; 95%+ with one.

Estimated savings · Hawaii

$530/ year

≈ $44.20 per month

Payback
1.7 yrs
Energy used
1,105 kWh/yr
25-year net
$12,359
CO₂ avoided
895 lb/yr

Monthly savings profile

Estimates only. Rate: EIA July 2026 state average; sun hours: long-term averages. See our methodology.

What to do now

  1. 1Don't connect a grid-tied plug-in system yet — without a law, it may breach your utility agreement.
  2. 2Consider an off-grid setup in the meantime: a panel charging a portable power station is legal everywhere.
  3. 3Cut your bill today with no-cost measures — see our guide to lowering your electric bill.
  4. 4Contact your Hawaii state legislators: constituent support is what moved the 2026 bills.

Hawaii plug-in solar FAQ

Is plug-in solar legal in Hawaii?

Not yet. A bill was introduced but stalled this session. Expect it back. Without a law, connecting a grid-tied plug-in system may violate your utility's interconnection rules. Off-grid setups (a panel charging a portable power station) are allowed everywhere.

How much can balcony solar save in Hawaii?

At Hawaii's average residential rate of 48.00¢/kWh (EIA, July 2026) and about 5.5 peak sun hours a day, a south-facing, tilted 800 W kit saves roughly $530 a year, paying back a $900 kit in about 1.7 years. Vertical railing mounts produce about 30% less.

What is the maximum plug-in solar size in Hawaii?

There is no Hawaii-specific cap yet. Most state laws settle on 1,200 W, the practical limit for a standard 15-amp, 120 V circuit.

Sources

Not legal advice. Laws and effective dates can change; confirm with official Hawaii sources and your utility.