A decade-long surge in home solar installations across the country is not just threatening to up-end the electricity market, but is also producing an unexpected knock-on effect for some major renewable projects.

The estimated 4 million properties that have solar panels on their roofs now inundate energy grids, pushing down the value of that electricity during the daylight hours.

Earlier this month, a solar farm owner in outback Queensland shut down his 16,000 panels, saying it was no longer viable to supply power to an area almost twice the size of Tasmania due to the low cost of energy.

Energy experts say the huge, continued growth of household solar and batteries means private solar farms risk becoming uneconomical.

Solar farm goes under

After eight years of powering homes across th

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