Virtual Power Plant

The basic idea

A single 10 kWh home battery can’t do much for a grid that operates at gigawatt scale. But 10,000 of them, coordinated in real time, represent 100 MWh of storage - enough to meaningfully support network stability during peak demand events or provide fast-frequency response services.

A VPP operator signs up households with compatible batteries, installs the necessary communications hardware (or uses the battery’s built-in API), and then dispatches the fleet as though it were a single large asset. When the grid needs power - a hot afternoon in South Australia when gas peakers are running flat out - the VPP operator can discharge the fleet simultaneously and sell that power into the wholesale market.

What participants get

Returns vary considerably by operator and scheme structure:

Bill credits: The most common arrangement. AGL’s VPP, for example, offers a credit per kWh dispatched. SA Power Networks’ VPP trial provided bill discounts to participants.

Upfront hardware subsidies: Some schemes offered reduced battery purchase prices in exchange for VPP participation. The South Australian government’s Home Battery Scheme (now ended) offered subsidies conditional on VPP enrolment.

Export tariff access: Some VPP operators negotiate wholesale-linked export rates that beat standard feed-in tariffs - participants get more per kWh exported during peak periods.

Reported annual returns for active participants range from around $200 to $800 per year, depending on scheme and dispatch frequency. These figures come from ARENA’s 2022 VPP review and various operator claims, which have not always been independently verified at scale.

What participants give up

The VPP operator can dispatch your battery - draw it down or charge it up - within agreed parameters. Most schemes protect a minimum backup reserve (so your battery isn’t flattened before an evening storm), but you lose some control over when the battery charges and discharges.

For households with high evening self-consumption, this trade-off matters. If the VPP dispatches your battery at 3 pm on a hot day to support the grid, it may not be full when you need it at 7 pm. Check the scheme’s dispatch rules and reserve guarantees carefully before signing up.

Compatibility

Not all batteries are VPP-compatible. Participation requires the battery system to accept remote dispatch commands, which needs compatible communications hardware and inverter firmware. Tesla Powerwall, Sungrow, BYD, and Alpha ESS batteries are generally compatible with one or more Australian VPP programs. Confirm with the specific operator.