Eight supply types
Every line on a register is one of eight supplies. Each page says which inventory category it lands in, whether it is reportable as imported energy, whether a programme can settle it, and what the regimes attach.
Grid electricity category 2; imported energy; electrical loadGas category 1Solar PV own generation; electrical loadBattery storage own storage; electrical loadEV charging category 2; imported energy; electrical loadDiesel or standby generation category 1District heat or cooling category 2; imported energyCHP category 1