The Three Benefits of a Commercial Battery Under the Flexible Trading Arrangements Rule

FTA Benefit #1: Earning Through Spot Price Arbitrage

FTA Benefit #2: Managing Network Demand Charges

This is where the FTA rule does more than most people expect. Part of what a commercial site pays on its electricity bill is network charges, which are based partly on the highest demand the site reaches. A battery dispatched purely on spot pricing, without regard for network demand thresholds, can easily push those demand charges up. Charging hard at the wrong moment, precisely when site demand is already climbing, works directly against the site’s network position even while it captures value on the spot market.

Under the 1 November FTA rule, only the main meter is measured for network charges. That creates a second benefit. By linking the main meter to the battery through a smart controller (a VPP controller), the battery can be optimised to step in whenever site demand climbs toward the level that would trigger a higher network charge, and hold it below that line. It can go further, discharging at the right moments to bring that demand level lower still. The same battery earning through spot price arbitrage is now also managing the site’s network charges in the background.

FTA Benefit #3: Preserving What the Site Already Has

The third benefit isn’t something the battery adds, it’s what the FTA setup protects. Because the rest of the site’s load remains on the main meter, shielded from the spot market, nothing the site already depends on is disturbed.

Existing solar continues to reduce usage and demand on the main meter exactly as it does today. Any demand flexibility already in place, whether through HVAC control, heat pumps, or similar measures, retains its full value and continues operating alongside the battery. The energy or building management system running those loads can be connected to the same VPP controller, so the battery charges and discharges in line with the site’s existing strategy rather than working against it.

Co-optimising the Three Benefits

These benefits don’t simply add up. Spot price arbitrage and network demand management draw on the same battery at the same moments, so the two are co-optimised, dispatched to capture the most value across both rather than maximising one at the expense of the other.

The third benefit sits apart from that balancing act: the site’s existing solar and flexibility measures stay on the main meter, shielded from the spot market, and continue reducing costs as they have been tasked. Understanding where each benefit originates is what allows the battery to be co-optimised across the two active streams while the third keeps delivering in the background.

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