Hawaii Home Battery Payback Calculator (2026)
Priced on Hawaiian Electric (Oʻahu) Schedule R (tiered flat; TOU-RI closed) rates and below-retail export rules. No federal tax credit is assumed — Section 25D ended 2025-12-31.
Why Hawaii is different
Hawaii is the extreme case in both directions. HECO's Schedule R residential rate runs about 47 cents/kWh — roughly 2.5x the US average and the highest of any state — so every self-consumed kWh is precious. But Hawaii ended traditional net metering in 2015: new systems export under Smart Export or the Customer Grid Supply programs, with reported export credits spanning $0.10-0.28/kWh (sources disagree; we treat the exact rate as verify-pending and flag it rather than pick a number). Battery-plus-solar is standard practice on Oahu and Maui for a reason, and island grids face storm outages with no neighboring state to import power from. State incentives are tax-based (RETITC) and their storage eligibility needs confirmation — check tax.hawaii.gov and DSIRE.
Rate structure
| Rate | Value | Notes |
|---|---|---|
| Peak rate (discharge window) | $0.47/kWh · tiered flat — same price every hour (TOU-RI closed to new enrollment 2022-10-31) | |
| Off-peak rate (charging) | $0.47/kWh | |
| Export credit | $0.20/kWh · Smart Export / CGS (below retail) | |
| Average residential retail | $0.470/kWh · HECO Oʻahu Schedule R tiered prices (2026-10): 0.4581 / 0.4721 / 0.4948, with a 500 kWh blend near 46.8¢ plus a $15.30 monthly fixed charge; the EIA statewide average of 48.0¢ (2026-07) is shown for comparison |
Verification status: Sourced. Schedule R is a tiered flat rate, represented all-in by the 47¢ blend; the voluntary TOU-RI is closed to new customers, so there is no official all-in TOU table to check
Export mechanism: below-retail export
Hawaii credits new solar exports below retail (Smart Export / CGS (below retail)). Energy you store and use yourself avoids the peak purchase but gives up the export credit, so its value is peak minus export — about $0.27/kWh. That gap is what a battery monetises.
Incentives and VPP
| Program | Status | What it means for a battery |
|---|---|---|
| RETITC (state tax credit) | Verify | Hawaii's RETITC covers solar (whether storage qualifies is unclear) and there is no cash battery rebate — check tax.hawaii.gov and DSIRE |
| Virtual power plant (VPP) | verify | program status changes frequently — verify current availability |
Outage context
Island grids face storm-related outages; backup value is high across HECO territory
Typical payback in Hawaii
Precomputed with the same model as the calculator, at the Hawaii rates above and the reference installed cost of $14,000 (13.5 kWh usable, pre-incentive). Your numbers move with your bill, your quote and your rate plan.
| Scenario | Year-1 savings | Simple payback | 10-year net |
|---|---|---|---|
| Have solar · $200/mo bill · 13.5 kWh · $14,000 installed | $372 | 37.6 years | −$9,752 |
| Have solar · larger bill · $600/mo bill · 13.5 kWh · $14,000 installed | $1,117 | 12.5 years | −$1,256 |
| Battery only · $200/mo bill · 13.5 kWh · $14,000 installed | $0 | — | −$14,000 |
Estimates only — not financial, tax, or installation advice. Backup value and program payments are shown separately and never folded into the payback ratio.
State data pack
| Field | Value |
|---|---|
| Default utility | Hawaiian Electric (Oʻahu) |
| Rate plan modelled | Schedule R (tiered flat; TOU-RI closed) |
| Average residential retail | $0.470/kWh |
| Verification status | Sourced |
| Data as of | 2026-10-18 |
| Official sources | HECO Oʻahu Schedule R effective rate summary, October 2026 (rate tracker citing HECO filing) (2026-10-18) · HECO Smart DER export rate range $0.15–0.28/kWh (2026-10-18) · Hawaii net metering history & CGS/Smart Export overview (2026-10-18) · EIA Electric Power Monthly Table 5.6.A (HI residential average) (2026-10-18) · Database of State Incentives for Renewables & Efficiency (Hawaii) (2026-10-18) |
Frequently asked questions
How much can a battery actually save on my Hawaii bill?
At the rates above, each self-consumed kWh is worth the peak rate minus the export credit ($0.47 − $0.20 = $0.27). The model caps discharge at how much of your usage actually falls in the evening peak, so the reference scenarios above are the honest range — your bill, your quote and your rate plan move them.
Does Hawaii pay for home batteries?
Hawaii's RETITC covers solar (whether storage qualifies is unclear) and there is no cash battery rebate — check tax.hawaii.gov and DSIRE Program terms change mid-cycle — verify on the program's own page before counting on any rebate.
Is a battery worth it in Hawaii without the federal tax credit?
Section 25D ended 2025-12-31, so every result on this site assumes no federal credit. That makes the break-even installed price the most useful number on the results screen: it is the price at which the ten-year arithmetic stops working at your assumptions. Compare every quote against it, and read the outage context above — backup is real value, just not a cash flow.
Keep reading
| All state guides — ten states, ten different answers | Directory |
| Data & method — every constant with its source and verification date | Data |
| Full guide — how to read a payback number and the mistakes that inflate it | Article |
| How the model works — included, excluded, and a worked example | Method |
This page is educational. It is not financial, tax, or installation advice. Data as of 2026-10-18.