Utility companies with Crystal Marks
Here is a list of utility firms (gas, electricity, phone and water companies) who have Crystal Marks, together with a link to their website where available.
- Bristol Water
- British Gas
- Cambridge Water Company
- Centrica
- Dong Energy Sales (UK) Ltd
- EDF Energy
- Electricity Supply Board (ESB)
- E-On UK
- Essex and Suffolk Water
- firmus energy
- Gazprom
- Hartlepool Water Company
- Mid Kent Water
- National Grid plc
- Northern Gas Networks
- Northern Ireland Electricity
- Northern Powergrid
- Northumbrian Water
- Npower
- Ovo Energy
- Scottish and Southern Energy
- Scottish Power
- Scottish Water and Sewerage Customers' Council
- Scottish Water Authority
- Severn Trent Water Limited
- South Staffordshire Water plc
- South Wales Electric (SWALEC)
- South West Water Services
- Southern Water plc
- SSE (Southern Electric)
- Thames Water
- United Utilities
- Utility Regulator
- Vallenfall Heat UK
- Wales & West Utilities
- Welsh Water
- Wessex Water
- Western Power Distribution
- Yorkshire Water
