A commercial battery earns most obviously by cutting your own bill — arbitrage, peak shaving, self-consumption. But there’s a second customer for its flexibility: the grid itself. Here’s what the grid actually buys, in plain English.
Why the grid pays for batteries
Great Britain’s grid must hold its frequency at 50Hz — continuously balancing generation against demand. As wind and solar replace heavy spinning plant, the system has less mechanical inertia, so it needs fast-responding assets standing by to catch deviations. Nothing responds faster than a battery, which is why batteries have become the principal providers of frequency response in the UK.
The services, in plain English
The National Energy System Operator (NESO) buys several forms of standing-by:
- Dynamic Containment — the post-fault catcher: if a power station or interconnector trips and frequency lurches, contracted batteries inject or absorb power within seconds to arrest the fall.
- Dynamic Moderation — the volatility damper: active when frequency is swinging hard, easing it back before it gets close to the limits.
- Dynamic Regulation — the continuous fine-tuner: constantly correcting small deviations rather than waiting for events.
Together these are NESO’s Dynamic response services. A battery earns from them largely by being available — paid for readiness, not just for energy delivered.
The Balancing Mechanism
Separately, NESO balances supply and demand close to real time through the Balancing Mechanism, accepting bids and offers to turn assets up or down. Batteries participate here too — effectively selling flexibility at the half-hours the system most needs it.
The catch: these markets move
Prices in flexibility markets respond to how much capacity has entered them, and the rules evolve — Ofgem approved changes to the frequency-response markets taking effect from 2026 into 2027. What pays best this quarter may not next. That’s the practical argument for automation: Nova AI re-decides the battery’s best use every 30 minutes — your site’s peaks, cheap charging, or grid revenue — rather than locking into yesterday’s answer.
What this means for a commercial site
You don’t need to become an energy trader. You need a correctly sized battery, a route into the markets, and software that optimises without you. That’s the system Novalux delivers — battery storage run by Nova AI, with the business case shown on your own half-hourly data. Request a Quick Quote to see what your site’s flexibility is worth.