Synergy, Western Australia's state-owned electricity retailer and generator, has been fined $1.2 million by the state's Economic Regulation Authority (ERA) over its Kwinana Battery Energy Storage System (KBESS1), a 100MW/200MWh grid battery. Some coverage framed this as a battery operator caught deliberately gouging the market. The ERA's own findings tell a more specific story.

What actually happened: across 83 dispatch intervals between late 2023 and mid-2024, Synergy's trading algorithm charged the battery during expensive periods (around $250/MWh) instead of cheaper windows, and submitted bids the ERA found formed "profit-maximising price offers", conduct that distorted prices in WA's Wholesale Electricity Market. The ERA estimates this added roughly $9.5 million to wholesale energy costs over eight months, while Synergy itself pocketed around $850,000 extra.

The part often left out: Synergy attributed the breaches to a software error in its trading algorithm, and the ERA's own determination accepted this, noting the conduct was unintentional and crediting Synergy's cooperation in fixing it. A coding fault that happened to produce profit-maximising behaviour is a different story to a trading desk deliberately gaming the market, even though the market impact was the same either way.

The bottom line: the fine, the dollar figures and the market distortion are all confirmed by the regulator. The "caught rigging prices" framing overstates intent the ERA itself didn't find, this is a cautionary tale about battery trading software, not proof grid batteries are being run as a rort.