Peer-to-peer energy trading, explained for Tasmania

“Peer-to-peer energy trading” gets used to mean at least three different things, and the confusion costs people money — usually by raising expectations that the technology cannot meet.

This article separates them out.

What peer-to-peer actually means

In a conventional retail arrangement, you buy electricity from a retailer at a rate they set, and you sell your surplus solar back to that same retailer at a feed-in tariff they also set. You have one counterparty and no say in the price.

A peer-to-peer marketplace changes the counterparty. Instead of buying from and selling to a single retailer, participants place buy and sell orders in a marketplace and are matched with other participants. Someone with surplus solar can sell it to someone who wants to buy it, at a price the two sides’ orders agree on, rather than at a feed-in tariff handed down to them.

LocalVolts operates a marketplace of this kind in Australia, and is available to grid-connected customers in Tasmania, as well as the ACT, New South Wales, Queensland and South Australia. Participants can choose preferred counterparties, set their own order prices, and access wholesale spot prices. Orders can be set to renew automatically so you configure your preferences once rather than trading manually.

The physics has not changed

Here is the part that gets lost. Peer-to-peer trading is a commercial arrangement, not a physical one.

The electrons from your neighbour’s roof do not travel to your house along a private wire. Everything still flows through the same poles and wires, operated by the same network business, subject to the same physics. What changes is the accounting: who is credited for the energy, and at what price.

This has a practical consequence people often miss. You still pay network charges. Buying from a peer rather than a retailer does not avoid the poles-and-wires cost of delivering it, and on a Tasmanian bill during a peak period, that network charge is typically the largest single component — often more than double the energy itself. We’ve broken that down in what you actually pay on a spot plan.

So peer-to-peer can improve the price of the energy line. It does not make the rest of the bill disappear.

Three things that are not the same

These get conflated constantly:

Peer-to-peer trading is about who you transact with. A marketplace matches your orders with other participants.

Spot pricing is about how the price is set. Your rate follows the wholesale market and changes every five minutes, rather than being fixed for the year. You can have spot pricing without ever placing a peer-to-peer order.

A virtual power plant is a different thing again: an operator aggregates lots of home batteries and dispatches them centrally, usually paying the householder for the right to control their battery at certain times. No vendor or retail VPP program operates in Tasmania. If someone quotes you VPP income on a Tasmanian home, that is a red flag worth asking hard questions about.

Most of the practical value available to a Tasmanian household today comes from the second one — price exposure — combined with something at home that can respond to it.

What we do, and what we don’t

We think it’s worth being precise about our own role here, because “peer-to-peer” can imply things we do not do.

We are an official LocalVolts data partner. With a customer’s explicit authorisation, given inside their own LocalVolts account, we can read that customer’s live prices and meter data through the partner API, and run our battery management against their real prices rather than an estimate.

The boundaries are firm:

The partner API we hold is read-only. It has no trading functions at all.
We do not place orders or trades on the LocalVolts market on anyone’s behalf. Not on our customers’ accounts, and not on our own.
Customers keep their own account and their own retailer relationship. Nothing about that changes.
The only thing acting on prices is the customer’s own battery, in their own home — charging, holding and discharging.

So when we talk about automation, we mean automating a battery against a price signal. We do not mean trading on a market. Those are genuinely different activities, and we’d rather draw the line clearly than let the word “trading” do work it shouldn’t.

Does peer-to-peer make sense for a Tasmanian household?

It depends almost entirely on what you have at home.

If you have solar and a battery: price exposure is worth something, because you have a way to respond to it. You can store energy when it’s cheap and avoid buying when it’s expensive. The marketplace element is a bonus on top of that; the battery is what does the work.

If you have solar but no battery: your exports happen when the sun shines, which across the whole state is exactly when surplus solar is most plentiful and prices are lowest. A marketplace may improve what you receive compared to a flat feed-in tariff, but it cannot change the fact that you are selling at the time of day everyone else is also selling.

If you have neither: there is very little to trade, and you carry price exposure on your consumption with no way to shift it. This is the case where a market plan can genuinely cost you more than a flat rate.

That ordering is not a sales argument, it’s just how the arithmetic falls out. The value of a flexible price is proportional to your ability to be flexible.

The questions worth asking

If you’re evaluating any peer-to-peer or spot-priced offer, these cut through most of the marketing:

What happens during the evening peak? That’s when power costs the most on every plan. An offer that only talks about cheap midday power is telling you half the story.
Are network charges included in the quoted rates, or added on top? A very attractive-looking energy rate can become an ordinary bill once the network charge and GST are applied.
What exactly can the operator control? Read-only data access and remote control of your battery are very different propositions. Both can be reasonable — but you should know which one you’re agreeing to.
What is the exit arrangement? Market plans move. Knowing how you leave is as important as knowing how you join.

The honest summary

Peer-to-peer energy trading is a real and genuinely interesting change to how electricity is bought and sold, and Tasmania is one of the places you can actually participate in it.

It is not a way to escape network charges, it is not a virtual power plant, and it is not a source of income for a house with nothing to offer the market. For a household with solar and a battery it is a useful improvement on a fixed feed-in tariff. For a household without either, it mostly just adds exposure.

Knowing which of those describes your house is the whole decision.

This guide was written by the Tasmanian solar team at Solar Generation Tasmania.

#solargentas #solargen #solargenerationtasmania

Published by Solar Generation Tasmania. General information current as at publication — rebates, tariffs and prices change, so confirm current figures before deciding.