Unused stored power is sold back to the grid, and a share of what it earns is credited to your bill.
The battery supports your home through the morning and the evening, keeps enough in reserve for the hours in between, and only sells what is spare.
Roughly seven to eleven in the morning, and five to nine at night, electricity is worth more than at any other time of the day. That is when the battery sells unused stored power back to the grid, twice a day.
The power itself sells at the going rate at the time. On top of that, most lines companies pay a published credit for putting power back into their network while it is busiest. Where your area pays one, it is counted in. The two together are what the battery earns.
Your share is set the day you join and steps up on a published schedule. It arrives as its own line on your bill, separate from what you pay for power, and it is always a credit, never a charge. Where it shows on your bill
| When | Your share | Why it moves |
|---|---|---|
| Years 1–3 | 20% | The first term, while the fleet is being built and the risk sits with us |
| Year 4 | 30% | The fleet has reached scale and earns more per battery |
| Year 5 onward | 40% | For as long as you stay with us, including after the three-year agreement |
For an example Christchurch home, in an average month at today’s prices:
| Your share | Most homes | Smaller homes |
|---|---|---|
| 20% | about $10 a month | about $14 a month |
| 30% | about $16 a month | about $20 a month |
| 40% | about $21 a month | about $27 a month |
The battery sells most in autumn and winter, when power prices are highest, and least in late spring and summer. Smaller homes draw less from the battery themselves, so more of it is spare to sell.
Two things are written into your agreement: your share percentage, and that your share arrives as a credit on your bill. What moves is the dollar amount, because it is a share of what the battery actually earns, and that follows the market and how hard your local network is running that month. It is not a guaranteed amount.
Your power rate · The agreement and fees
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