AvantiGas Ltd

BP Gas

Calor Gas Ltd

Cofely UK

Corona Energy Ltd

E.ON UK plc

EDF Energy

EDF Energy

EDF Energy

Energy 4

Energy Quote

ENGIE

Five-Quarter Energy Holdings Ltd

Gazprom Energy

Gazprom Marketing & Trading

Gleaner Oils Ltd

Good Energy Ltd

Infinis

Minesto UK Ltd

npower

npower Direct Ltd

Renewables Direct Ltd

RWE npower

Scottish & Southern Energy

Scottish & Southern Energy plc

Scottish Power plc

Scottish Water

Severn Trent Water Ltd