The Three Core Operating States
Charging
When there is too much electricity being generated — perhaps on a very sunny, windy day when demand is low — the BESS draws that excess power from the grid and stores it in its batteries. This prevents grid overload and ensures valuable renewable electricity is not wasted.Discharging
When demand is high or renewable generation suddenly dips, the BESS releases its stored electricity back onto the grid. This fills the supply gap instantly, without waiting for a power plant to ramp up.Standby
When not actively charging or discharging, the BESS remains connected to the grid, constantly monitoring conditions and ready to react within milliseconds when a new command arrives.Why BESS Flexibility Matters
Unlike traditional power plants, which can take minutes or hours to ramp up or down, a BESS can switch between charging and discharging in a fraction of a second.
- Instant response: Millisecond reaction times make BESS ideal for managing sudden grid events.
- Bidirectional flow: A BESS can both absorb and inject electricity, offering a two-way street for energy flow that is essential for balancing the grid.
- Smoothing variability: By absorbing and releasing power rapidly, BESS smooths out the ups and downs caused by intermittent renewables, providing a more consistent and reliable electricity supply.
- Maximising renewables: By storing excess renewable energy that would otherwise be wasted, BESS enables greater use of clean energy and reduces reliance on fossil fuel backup generation.