Five days earned 38% of Australia's grid battery revenue in October
Serguey Asael Shinder2 min readAustralia's grid-scale batteries earned an estimated AU$37.62 million in the National Electricity Market in October, according to NEMPulse figures reported by Energy-Storage.news on 2 November. NEMPulse tracks dispatch and revenue from public AEMO data and covers 63 systems across New South Wales, Victoria, Queensland and South Australia. September's total had been AU$33.35 million; measured per megawatt per day, earnings rose 3% to AU$126.
Normalised across 9,595 MW and 22,964 MWh of active capacity, the fleet earned AU$3,921 per MW in the month, about AU$46,000 per MW a year annualised, against roughly AU$38,000 in the third quarter. Energy arbitrage supplied 97% of the total, frequency control ancillary services 2% and estimated frequency performance payments the remaining 1%.
The money was concentrated. Five of October's 31 days produced 38% of the fleet's earnings, compared with 15% for the top five days in the third quarter. The strongest day was 12 October at AU$6.82 million, when a two-hour extreme price event hit New South Wales and spot prices reached the market cap of AU$23,200/MWh. The average daily spread across the five regions, top two hours minus bottom two, rose 62% to AU$189/MWh. The top earners for the month were Eraring (AU$2.63 million), Orana (AU$2.06 million) and Melbourne Renewable Energy Hub A3 (AU$1.86 million). NEMPulse's numbers are gross market estimates and exclude contracts, hedges and network-support payments.
What it means
A battery's year is made on a handful of afternoons. When 38% of a month comes from five days, availability on those days matters more than average efficiency, and a project that misses one event can lose a meaningful share of its income. The figures also show why revenue estimates swing so much from month to month: the spread was wider in October, but it was the scarcity events, not the daily cycle, that set the total.