In <a href="https://www.eia.gov/todayinenergy/detail.php?id=66164" target="_blank">EIA</a>'s <a href="https://www.eia.gov/electricity/data/eia860/" target="_blank">annual survey of power plant activity</a>, EIA asks operators of utility-scale batteries how they are using their systems, and one use case is increasingly prevalent: price arbitrage. Arbitrage involves buying electricity when prices are relatively low and selling that electricity when prices are high.