The fourth round of the Green Energy Auction, prepared through 2025, offers something the first three did not: solar and onshore wind paired with battery storage, contracted as one plant that can shift part of its output into the evening. The department calls the product integrated renewable energy and energy storage. The idea is to buy firm renewable capacity rather than midday energy.
Compiled in September 2026 from the releases of the time, with the revisions the agencies have published since. Nothing here is a forecast.
Why the product changed
After two rounds of solar and wind, the grid had more midday energy than it could always use and no more evening capacity than before. Curtailment had begun to appear on sunny weekends. The third round bought pumped storage for the long term; the fourth buys batteries for the near term, because a battery can be installed in a year and a reservoir cannot.
What a paired plant is
A solar farm with a battery sized to hold a few hours of its output, dispatched so that the contracted capacity is available in the hours the grid nominates. The developer is paid for delivering capacity into the evening, not only for energy at noon. The economics depend on the battery price, which fell sharply through 2024, and on the round's rules for how much of the day the plant must cover.
What it means for the price of renewable power
Firm renewable electricity costs more than midday renewable electricity, and this round is the first to put a public price on the difference. That price is the benchmark a factory's green-option contract will move towards, and the number a site's own generation is measured against in the evening rather than at noon.
Where a site's own plant fits
A residue-fired boiler with a turbine is a firm renewable plant already: it runs at 7 p.m. in May because the fuel is in the yard. The auction is the grid paying for the same property with batteries. A site that has it does not need to buy it.
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