Powerwall in Hawaii’s no-export world
In plain English: Hawaiian Electric’s modern solar setup — your system can’t send power to the grid, so every kWh must be used or stored at home.
45¢ retail power and zero credit for exports: every solar kWh you fail to use or store is simply thrown away. Hawaii is self-consumption in its purest form.
The plan at a glance
| Period | Hours | Rate |
|---|---|---|
| All hours | Every day | ~$0.45/kWh |
| Exports | Any hour | $0.00 — no export credit |
Island rates vary; the shape — high retail, no export value — is the strategy driver. Rates come from the published tariff as reflected in SolDial's rate database in mid-2026 — always verify current numbers with your utility.
What this plan means for a Powerwall
With no export credit, the enemy is curtailment: a full battery at noon means your panels are producing 45¢ energy that goes nowhere. The strategy is to make sure the pack always has room when the sun is strong — run the house on battery through the evening and overnight so the morning starts with headroom, and never burn grid power while stored solar sits idle.
At 45¢, the math is enormous by mainland standards: a household self-consuming 15 kWh of solar daily that would otherwise be lost is keeping roughly $200/month off its bill. The battery isn’t an optimizer here; it’s the difference between owning solar and merely hosting it.
The automations worth having
A morning-headroom check (alert if the pack is still nearly full at sunrise); overnight self-powering; storm awareness for outage readiness; and visibility into every wasted kWh — SolDial’s history shows exactly when production had nowhere to go.
Does this apply to my exact situation?
Plans vary by zone, season, and enrollment vintage, and utilities revise rates. SolDial matches your account to the actual published schedule from ~50,000 tariffs and recomputes the strategy — and the honest savings math — from your windows, not a blog’s snapshot. If your plan differs from this page, the app follows your plan.