The short version
- Solar → battery → export later is explicitly encouraged under SDG&E's Solar Billing Plan.
- A battery in a virtual power plant or approved aggregation can already discharge to the grid for compensation.
- A standalone home battery used as an unrestricted merchant plant — charge cheap, sell high, daily — has no general residential tariff.
- SDG&E runs a dynamic export pilot built for exactly that trade. It is business-only.
- The CPUC has concluded standalone storage is not an eligible renewable generator for export compensation under the customer-generation tariffs.
- This is a market-access restriction, not a physics or metering one. The hardware already does it.
The short answer
Yes, but only in specific approved structures. A residential battery in SDG&E territory can legally discharge energy to the grid and be compensated in a number of circumstances. What you generally cannot do today is run a standalone home battery as an unrestricted merchant power plant — charging whenever power is cheap and selling whenever it is dear, on your own schedule, as a routine business.
| Residential setup | Legal to export and be paid? |
|---|---|
| Solar → battery → later export to the utility | Yes |
| Solar + battery participating in a virtual power plant or grid event | Yes |
| Battery participating through an approved aggregator | Yes, subject to program and interconnection rules |
| Buy grid power cheap → battery → routinely sell it back high under the ordinary residential plan | Generally no, not as unrestricted arbitrage |
| Standalone battery → post an ask and sell to the utility whenever you like | No general residential tariff for this |
| Battery → sell directly to your neighbour at your own price | No open residential peer-to-peer retail market |
What is actively encouraged
If your battery is paired with solar, exporting is not a grey area — it is the design intent. SDG&E's guidance on its Solar Billing Plan encourages solar paired with battery storage precisely so customers can store electricity and export it back to the grid later, during the hours when it is worth most (SDG&E).
That is not generosity. Under an hourly export structure, midday exports are worth very little because midday is exactly when the grid is saturated with solar, and evening exports are worth multiples more. Shifting your export from noon to 7pm is where the value is — which is the whole argument for adding storage. Our guide on whether a battery is worth it works those numbers, and net metering and its successors covers the mechanics.
The aggregator and VPP routes already work
There are live programs where a residential battery discharges to the grid and gets paid, and they are worth knowing about because they are the legal version of the thing people assume is banned outright.
- Emergency load reductionSDG&E's Emergency Load Reduction Program can compensate a customer for battery exports where the resource has the required Rule 21 export capability and an export agreement in place (program FAQ).
- Virtual power plantsTesla's program page for its SDG&E virtual power plant states that participating residential Powerwalls discharge during grid events and receive $2 per kWh for qualifying additional energy delivered during an event (Tesla).
- Wholesale aggregationSeparately from any retail tariff, distributed resources can be pooled and bid into the wholesale market through the aggregator role — a different regulatory framework entirely, and an open one.
So a home battery exporting to the grid for money is not hypothetical. It happens every time one of these programs dispatches.
The weird part
Now take the solar away. Suppose you have a battery and no panels at all.
At 2am, grid power is cheap, and the battery charges 50 kWh. At 7pm, power is worth many times more, and the battery exports 45 kWh. You would like to be paid the high evening price for it.
That is a completely ordinary energy trade. It is also, more or less exactly, the business SDG&E's Dynamic Export Rate Pilot is built around — the utility describes it in terms of buying electricity when prices are low and selling it back when prices are high (SDG&E).
The pilot is for business customers. There is no generally available residential equivalent today.
The statutory wrinkle
There is a specific legal reason the residential side is harder than it looks. In its tariff proceedings the CPUC has concluded that standalone storage is not an eligible renewable generator for export compensation under the customer-generation tariffs established under Public Utilities Code §2827.1 (CPUC).
That matters because those customer-generation tariffs are the framework the residential export world is built on. If standalone storage is not eligible under them, a battery with no generation attached cannot simply slot into the compensation structure that a solar-paired battery uses.
It does not mean a standalone residential battery can never export. Rule 21 has pathways for storage and generation facilities with approved export capability (SDG&E), and wholesale participation is a separate framework with its own door. The constraint is narrower and stranger than a ban: it is about which market or tariff the battery is allowed to participate through.
Why this is the interesting one
Most regulatory gaps in energy exist because something is genuinely hard — metering that does not exist, settlement that cannot be verified, a consumer-protection problem nobody has solved. This one is not like that.
The hardware ships today. The battery already knows its state of charge, already responds to price signals, and already exports during VPP events. The meter already records interval data. The utility already runs a dynamic export tariff — for other customers. Every technical component of residential battery arbitrage is installed and working in California right now.
What is missing is a tariff a household is allowed to use. That makes it, to our eyes, one of the cleanest examples of a market that is closed by category rather than by capability — and the closest neighbour to the residential Direct Access question, which is the same shape of problem one step further out.
What we are asking for
These are our positions, not pending legislation.
- A residential dynamic export tariffExtend something like the business dynamic export pilot to households, on an opt-in basis, with the same metering and interconnection requirements. The pilot structure already exists; the question is who is allowed into it.
- Fix the standalone-storage eligibility gapAddress the exclusion of standalone storage from customer-generation export compensation directly, rather than leaving batteries to qualify only by having panels bolted to them.
- Keep the interconnection barNone of this should mean skipping Rule 21 export review. Approved export capability is the right requirement and should stay.
- Make VPP participation portableA household should not have to pick a battery brand to get access to grid-event compensation.