Who supplies the LD postcode area?
Electricity distributor, gas network and water wholesaler for LD — the fixed infrastructure companies for this postcode area, and how they differ from the supplier on your bill.
Electricity distributor
The LD postcode area is served by National Grid Electricity Distribution (Southern Wales), MPAN distributor ID 21. This is the company that owns the wires and substations here and responds to power cuts — call 105, free, from any phone. It is not who you pay for electricity.
Gas network
LD is served by Wales & West Utilities (Wales & South West England). If you smell gas, leave the property and call 0800 111 999, the National Gas Emergency Service, free and staffed 24 hours a day, the same number regardless of which network covers your address.
Water wholesaler
Welsh Water (Dŵr Cymru) is the water and wastewater wholesaler for LD. Household customers cannot switch wholesaler; non-household (business) customers can switch retailer under the Open Water market while Welsh Water (Dŵr Cymru) remains the fixed network operator underneath. Leak line: 0800 281 432. Emergency: 0800 281 432.
Price cap for Southern Wales, 1 October – 31 December 2026
LD falls in Ofgem's Southern Wales price-cap region. The Direct Debit single-rate cap here:
| Fuel | Unit rate | Standing charge |
|---|---|---|
| Electricity | 26.55p/kWh | 55.41p/day |
| Gas | 8.09p/kWh | 29.96p/day |
Great Britain average electricity unit rate for comparison: 26.32p/kWh. On Ofgem's typical consumption values (2,500 kWh), that is roughly £866/year for electricity alone. Full payment-method breakdown on the energy price cap page.
Distributor is not supplier
Everything above is your fixed network infrastructure — it cannot be switched and has no billing relationship with you. Your energy supplier is the separate, competitive company you actually pay, and you can switch it at any time using Ofgem's find my supplier guidance if you've lost track of who that is. On the gas side, registrations are held centrally by the Meter Point Administration Service — your supplier can look this up for you using your MPRN.
- National Grid Electricity Distribution — the MPAN distributor ID is 21. This is the Distribution Network Operator that owns the wires in LD, not necessarily who you pay for electricity.
Send us one bill. We'll send back every overcharge — and the cheapest legitimate replacement.
Whether you run a Mayfair restaurant group or rent a flat in Salford, the audit is the same and the fee is the same: nothing, unless we save you money.