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Rooftop solar panels are becoming such a powerful factor in the energy market that they now can push the price of electricity to negative territory in the sunniest regions of the world. This is possible because powering down fossil fuel energy generators during peak solar power periods would be more expensive than paying customers to use the electricity. The negative energy price barrier was breached in Queensland, Australia, where low demand and high rooftop solar power generation pushed the wholesale electricity price to AUD -$100 per megawatt-hour on Wednesday afternoon, July 2. This is mid-winter in Australia, so daily temperatures are mild. Household appliance usage dips in the early afternoon and peaks in mornings and afternoons, so an early afternoon