Who supplies the HA postcode area?
Electricity distributor, gas network and water wholesaler for HA — the fixed infrastructure companies for this postcode area, and how they differ from the supplier on your bill.
Electricity distributor
The HA postcode area is served by Scottish & Southern Electricity Networks (Southern England), MPAN distributor ID 20. 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.The HA (Harrow) postcode area, in outer west London, is generally SSEN Southern England territory rather than UK Power Networks London — confirm from your MPAN.
Gas network
HA is served by Cadent Gas (North London). 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
HA sits on a boundary covered by Thames Water and Affinity Water. Water wholesaler boundaries frequently don't align with postcode-area boundaries; the exact company depends on the full postcode, not just the area letters. Household customers cannot choose between them regardless — the wholesaler is fixed by address.
Price cap for Southern England, 1 October – 31 December 2026
HA falls in Ofgem's Southern England price-cap region. The Direct Debit single-rate cap here:
| Fuel | Unit rate | Standing charge |
|---|---|---|
| Electricity | 26.47p/kWh | 47.81p/day |
| Gas | 8.17p/kWh | 29.16p/day |
Great Britain average electricity unit rate for comparison: 26.32p/kWh. On Ofgem's typical consumption values (2,500 kWh), that is roughly £836/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.
- Scottish & Southern Electricity Networks — the MPAN distributor ID is 20. The HA (Harrow) postcode area, in outer west London, is generally SSEN Southern England territory rather than UK Power Networks London — confirm from your MPAN.
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.