Your battery and the gridVerified 17 October 20265 min read

Virtual power plants in summer: what to ask before you join

What a virtual power plant (VPP) does with your battery, and what to ask before you join one.

A hot evening: the operator calls on every battery at once

Each battery sends power to the grid when the operator asks, so less may be left for your own evening.

A drawing of how a virtual power plant (VPP) works. How often the operator uses your battery, and when, is one of the questions to ask before you join.

What this means for you

Joining hands some control of your battery to the operator. Ask when it can use your battery, and how often, before you say yes.

A virtual power plant (VPP) lets a company use your battery in return for a benefit. Hot summer evenings are a time the grid is under strain, and a time a VPP may call on your battery. Here is what to ask before you say yes.

In short

A virtual power plant (VPP) is a group of home batteries run together by a company, in return for a benefit. Hot summer evenings are when the grid is under strain and when a VPP may call on your battery. Ask what you get, how often it uses your battery and how to leave, before you join.

What a VPP is

It is a group of home batteries run together by a retailer or another company. The government's solar guide says the operator controls your battery for some or all of the time, in return for a benefit. Those benefits can include:

  • lower electricity prices, or a zero bill guarantee,
  • a higher feed-in rate,
  • a discount on the battery itself, or
  • a regular payment in place of a bill.
An Australian street of solar homes at dusk, joined by power poles and lines

Why summer matters

The grid is under the most strain on hot evenings, when cooling demand is high. The Australian Energy Market Operator's report for January to March 2026 compared example homes. Those with solar and a battery kept sending power to the grid for longer in the evening peak (4pm to 9pm) than those with solar alone. A VPP is one way a battery can be used in that window.

What to ask before you join

  • What do I get, and how does it show on my bill? Ask whether it is a credit, a lower rate or a payment, and when it appears.
  • How often will you use my battery, and when? More use means more charging and discharging, which can shorten the battery's life.
  • What happens in a blackout? A VPP can leave you with no stored power if the grid goes down. Some programs keep part of your battery back for that. Ask if yours does.
  • Does it affect my warranty? Check with the battery maker as well as the retailer.
  • Does my battery need the internet? Joining needs an ongoing connection.
  • How do I leave? Ask how long the deal lasts and whether there is an exit fee. By law you have 10 business days to cancel a new energy contract without paying exit fees. A VPP agreement can have its own terms, so check how to leave it.

Each VPP has different benefits and different risks, and the government's guide says it can be hard to work out the best deal. Read the details before you sign, and look for reviews from other owners.

How PowerLens treats VPP offers

  1. Step 1

    Upload your bill

    We read what you pay now, exactly, from your own bill.

  2. Step 2

    We price every plan in your area

    Every plan in the government's open plan data, priced on your use.

  3. Step 3

    Stay or Switch

    If staying put is the better plan, that is what the report says.

A bill can't price a VPP offer. Where your power goes hour by hour decides whether a VPP plan suits you, and only detailed meter readings show that. So PowerLens doesn't price VPP plans from a bill alone. Adding your meter data file (NEM12), the detailed usage record from your smart meter, is free. PowerLens then prices the electricity side of those plans against your real half hours and adds an estimate of the VPP benefit, based on VPP terms we check by hand.

PowerLens doesn't sign you up to a VPP or control your battery. Retailers never pay us, and they can't buy a place in your results. No saving is guaranteed.

Next: should you switch plans after a battery, or start with a recent bill.

Where to check the details

Know someone with solar or a battery? Send them this guide.

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Check your own plan

Upload your bill and we price every plan in your area against it.

Upload your bill
  • The check is free. You only pay if we find you a better plan.
  • Retailers never pay us.
  • Your bill file is deleted once we've read it.