A VPP is a way of treating many small batteries as one large resource. To do that the operator needs the ability to send instructions to each battery, which is why the federal program asks for batteries to be VPP capable.
How control works
Your battery or inverter is connected to the internet, and the operator’s platform communicates with it, directly or through the manufacturer’s cloud. Typical instructions include:
- Charge during cheap or oversupplied periods, such as midday when solar is strong.
- Discharge during peak demand or high-price periods, sending energy to the home or the grid.
- Hold the battery at a level, for example to keep reserve ahead of a storm warning.
The operator works within limits in your agreement. These usually include a minimum state of charge you keep for backup, a cap on how many events are called, and rules for how your own use takes priority.
What you can usually control
Look for these features before joining:
| Feature | What to ask |
|---|---|
| Backup reserve | What minimum charge is always left? |
| Opt-out | Can I skip an event, and how many times? |
| Visibility | Can I see events and payments in an app? |
| Own use | Does my home take priority over exports? |
Does a VPP affect the warranty?
Battery warranties are written by manufacturers. Many state a throughput or cycle limit, for example a total energy or number of cycles over a period, and VPP participation can increase cycling. Some manufacturers explicitly support VPP use with approved operators, and others limit the cover. The honest answer is that it depends on the battery brand and the operator, so ask the manufacturer or installer for something in writing.
Points to check:
- Does the warranty allow third-party control, and with which operators?
- Is there an annual throughput limit, and does the VPP count towards it?
- Who deals with a fault if the operator’s software was in control?
What this means for homeowners
Join only with an operator the battery’s maker supports, and keep the paperwork. Remember the federal discount does not require you to join, so a warranty doubt is a good reason to wait. The pillar page summarises the program rules.
What this means for installers
Know which operators your preferred brands are approved with, and say so plainly. Installers are often the first person a customer calls when a battery behaves unexpectedly. For the certificate side, include the model and serials accurately: see the battery submission guide, the rate on /pricing/, and our guide to the 2026 program.