TNUoS exposure for BESS depends on connection type and direction of flow

Grid connection Import (demand) Export (generation)
Distribution
under 100 MW
Fixed cost: £0 If declared as Non-Final Demand
Flexible (Triad) cost: avoidable T-Demand locational (Triad import tariff), set by metered demand at Triad periods
Fixed credit: £0
Flexible (Triad) credit: available Embedded Export Tariff (EET), varies by region. £0 in Scotland, Northern, North West and Yorkshire
Transmission or distribution ≥ 100 MW
Fixed cost: £0 If declared as Non-Final Demand
Flexible (Triad) cost: avoidable T-Demand locational (Triad import tariff), set by metered demand at Triad periods
Fixed cost: £+/− Wider generation tariffs scaled by ALF. Cost or credit by zone
Flexible (Triad) cost: £0