I seen video too, but Gridserve aren’t a electricity supplier as far as I’m aware. Same logic as anyone in here having a power wall and some solar to offset their usage (albeit on a larger scale). Still need a supplier.According to the Fully Charged video posted earlier today they have their own solar farm and so claim to supply themselves, albeit by trading off the Forecourt's usage against what they produce for the grid. They're also using the on-site 6MWh battery for grid storage & balancing, which will itself be netting them a decent secondary revenue stream.
GRIDSERVE PURCHASES CLAYHILL SOLAR FARM TO SUPPLY FIRST ELECTRIC FORECOURT® AND #DELIVER NET ZERO | Gridserve