“They can trade it [the electricity], sell it to the wholesale market, or gift it to family and friends,” he said.
RedEarth’s technology links a series of personal power plants into either a community network or a virtual power plant.
“The internet of energy is how we turn thousands of individual homes with solar panels and batteries into a network that optimises the generation, transmission and utilisation of electricity,” Mr Walker said.
“It transforms the existing [electricity] grid into a new version ready for the 21st century that can use and distribute 100 per cent renewable electricity generated directly from the Australian sunshine.”
Ellen Roberts, national director of Solar Citizens, said both community batteries and virtual power plants – solar energy collected from connected rooftops – were exciting developments.
Ms Roberts believed RedEarth’s virtual power plant would be the first to operate in Queensland, although the state government-owned Yurika Energy is exploring a small-scale community battery in Townsville.
“I think it is a very good way of co-ordinating solar power,” Ms Roberts said.
“At the moment we just have a very simple system, where people export power to the grid in a one-way direction.
“Virtual power plants allow that to be much more sophisticated and to maximise the benefits to other energy users, who can access the cheap energy.”
People who join virtual power plants are paid an annual fee by the plant operator to use the electricity in their batteries.
In 2020 and early 2021, RedEarth partnered with Byron Bay-based Enova Community Energy for a successful trial of 40 homes in Byron Bay.
Customers can generate and sell, trade or gift their stored electricity to other users on RedEarth’s platform, giving them an ongoing income stream.
RedEarth redirected its renewable energy efforts after raising $8 million from investors, including the Queensland government’s Business Development Fund.
“The whole solution is that if you have solar on your roof and a battery in your basement, you can make enough power for yourself,” Mr Walker said, “you don’t need to buy it from the line [grid].”
However, a household renewable energy battery from RedEarth costs between $6000 and $20,000 – a significant sum that’s in addition to a household solar energy system from $4000 to $9000.
RedEarth co-founder Chris Winter says battery costs are decreasing by 20 per cent a year, while south-east Queensland’s electricity prices are expected to fall slightly over the next three years.
Mr Winter sees RedEarth’s system as a subtle shift in emphasis.
“In its most basic form, [solar] is a way to use and store your own power,” he said. “However, if you’ve invested in a battery system, the personal power plant just magnifies the value of that to you.
“In a more complex way, it is basically a way of monetising your own electricity.”
The pair compare what is happening in the electricity industry with the shift to mobile phones when fixed-line telephones were phased out.
“The old technology is the coal-fired power station, with hundreds of kilometres to bring the power to you,” Mr Winter said.
“Half of your electricity bill comes from maintaining those poles and wires, not from making the electricity.
“Now, with solar panels and batteries, we can produce the electricity at home.”
Tony Moore is a senior reporter at the Brisbane Times