Voltage control and reactive power: the new value of batteries, renewables and industryAleaSoft Energy Forecasting, August 7, 2026. It also changes the resources the system needs to keep frequency and voltage within safe limits, and with them the value that batteries, renewable energy and industry provide. Active power and reactive power, two distinct functionsThe electricity that flows through the grid includes active power and reactive power. Reactive power contributes to voltage control and is essential for the grid to operate safely. A facility can produce few megawatt hours at a given moment and, at the same time, provide a valuable service by generating or absorbing reactive energy.