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If a salesperson tells you this month that a particular battery is the one that gets you into a virtual power plant in Western Australia, they are ahead of the paperwork. Synergy opened applications on 24 August 2026 for organisations wanting to join something called the Aggregator Panel. The round runs four weeks. Nobody on that panel has a contract yet, and no household in the South West Interconnected System can be enrolled in anything as a result of it.
That is the short answer. The longer one is worth having, because the framework underneath it explains why virtual power plants have been slower to arrive in Perth than in Sydney or Adelaide, and what has to happen before one turns up on your street.
Synergy's retail and aggregator roles
In New South Wales or South Australia, an aggregator who wants to use your battery signs you up directly. You pick a retailer, they pick you, and the orchestration deal rides along on top. Western Australia does not work that way, and the reason has nothing to do with technology.
If your home or small business consumes 50MWh a year or less, you are what the market calls a non-contestable customer. That covers effectively every house in Perth and most small businesses on the network. A non-contestable customer cannot buy electricity from anyone other than Synergy. There is no second retailer to switch to.
So an aggregator who wants to orchestrate the batteries sitting on 40,000 Perth roofs has a structural problem: the retail relationship they need is one they are not allowed to hold. The Third Party Aggregation Framework is the answer to that. Synergy is required to act as what the framework calls the Parent Aggregator, publishing and maintaining the rules by which a third party can reach those customers through Synergy rather than around it. The framework, a model contract and a handbook all took effect by 1 July 2026, and Synergy undertook to open the first panel round within two months of that date. It did, with a week to spare.
Panel membership and service contracts
This is the part that gets overstated, so it is worth being exact about it. Aggregator Panel membership makes an organisation eligible to provide market services to AEMO or Western Power using the distributed energy resources of non-contestable customers. Synergy says in its own notice that membership does not guarantee a services contract. A panel member still has to bid into future service opportunities and be selected.
Count the steps between today and an offer landing in your inbox. An organisation applies during this four-week window. It executes the TPA Model Contract with Synergy and joins the panel. A service opportunity is put to market by AEMO or Western Power. The panel member bids, and wins. Only then does anyone have a product to sell you.
Four steps, and the first one closes around 21 September. Anyone describing a WA virtual power plant as something you can join this spring is describing step four while step one is still open.
Battery sizing without assumed VPP income
Nothing, and that is the useful advice here rather than a dodge.
We size batteries to the load in the house, because that is the part of the arithmetic that is knowable. A 10kWh battery in a Baldivis three-bedder with a $520 quarterly bill either pays for itself on self-consumption and DEBS or it does not, and a hypothetical orchestration payment three or four steps down a procurement process does not change that sum. If the system does not stack up on its own numbers, an aggregator contract that may not exist is not the thing that rescues it.
The specific trap is a premium quoted today for hardware described as ready for a program nobody has been awarded. We have seen this pattern before with flexible exports, where the compliance requirement was real and the timeline in the sales pitch ran about a year ahead of the network. If you are being asked to pay more for a particular inverter or battery on virtual power plant grounds, ask which panel member the seller has a contract with. Right now the honest answer is none, because there are none.
What is worth doing is unglamorous. Keep the system standards-compliant and remotely manageable, which for a grid-connected battery in this state means AS/NZS 4777.2 inverter compliance and a communications path that is not dependent on a proprietary hub nobody supports in five years. That is the same advice we would give if this framework did not exist, which is a decent sign it is the right advice.
Future VPP terms
Assume the panel forms in October, a service opportunity runs, and someone wins it in 2027. At that point the questions get real and they are worth knowing in advance.
We will read the model contract when the panel is populated and write about what it obliges a member to do, because that document sets the floor under every offer that follows. For now the sensible position is that a battery bought on its own merits will be eligible for whatever eventually arrives, and a battery bought on the promise of it is a bet on a procurement process.
If you want the system sized on the load rather than the speculation, get a quote and we will show you the arithmetic.