SolarStack: The Collingwood startup turning Melbourne's rooftops into a virtual power plant

Deep in the laneway offices of Collingwood, a three-year-old startup called SolarStack is pulling off something most energy retailers have struggled with for years: making distributed solar generation actually profitable for householders while stabilising the grid.

The company's software orchestrates thousands of rooftop solar systems across greater Melbourne—currently around 12,000 installations, from Williamstown to Belgrave—bundling their output into aggregated blocks that trade on Australia's wholesale energy market. For homeowners with panels, it's a way to earn revenue beyond their standard feed-in tariffs, which currently average 15 cents per kilowatt-hour across Victoria. SolarStack users report supplementary earnings of $800 to $1,200 annually, a figure that catches attention on Mumsnet forums and local Facebook groups.

What makes this month particularly significant is SolarStack's partnership expansion with three major Victorian councils, including Moreland and Yarra, to retrofit council buildings and community centres with smart-enabled solar systems. The Abbotsford Community House and several Fitzroy primary schools are now pilot sites. It's a validation moment for a company that started in a coworking space on Gertrude Street and now operates from a proper office overlooking the Collingwood Football Club's training ground.

The broader context matters. Victoria's renewable energy penetration has hit 45 per cent this year, up from 28 per cent in 2020, but the grid operator frequently grapples with sudden supply swings when cloud cover drops solar output dramatically. Traditional demand-response programs struggle because residential users aren't coordinated. SolarStack's algorithm does the coordinating, essentially treating Melbourne's rooftops as a single, intelligent power station.

The startup has raised $18 million in Series A funding, with backing from several European climate-tech investors who recognise Australia's unique opportunity: high solar penetration, deregulated wholesale markets, and favorable climate policy settings under the new Commonwealth framework.

For ordinary Melburnians, the significance is straightforward. As energy costs remain volatile and grid reliability questions persist, having a local company cracking the code on real solar profitability and stability matters. It's the kind of unsexy infrastructure innovation that rarely dominates tech headlines but quietly underpins the city's energy future.

SolarStack plans to expand to 50,000 rooftop installations by 2028. If they pull it off, Melbourne becomes a genuine global model for distributed renewable integration.

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