Compare gas and electricity prices in Cardiff (Caerdydd), Wales. Cardiff has approximately 155,800 households across a population of around 373,300, served by CF postcodes. Cardiff's electricity is distributed by National Grid Electricity Distribution (South Wales) and gas is distributed by Wales & West Utilities — the same physical infrastructure regardless of which energy supplier you choose. Switching supplier causes zero interruption to your supply.
Electricity unit rates in the South Wales distribution region (Ofgem TDCV 2,700 kWh/year, Q3 2026 (from 1 July 2026)): Outfox Energy Fix'd 12M — 20.80p/kWh, 57.86p/day standing charge, ~£773/year (elec); E.ON Next Fixed 12M — 21.30p/kWh, 57.86p/day, est. £786/year (elec); Sainsbury's Energy Fix & Save 15M — 22.22p/kWh, 57.86p/day, ~£811/year (elec); Utility Warehouse Fixed Saver — dual-fuel, £50 below the Ofgem Price Cap (£1,663/year). South Wales standing charge at 57.86p/day is below the England & Wales average of approximately 61p/day.
Electricity: National Grid Electricity Distribution (South Wales), formerly Western Power Distribution — manages the distribution network across all CF postcodes (CF1–CF64). Power cut helpline: 105. Gas: Wales & West Utilities — operates over 35,000 km of gas pipes across Wales and the South West of England, serving all CF-postcode areas. Gas emergency: 0800 111 999.
Standard single-rate meters: most common across CF postcodes, all tariffs available. Economy 7 dual-rate meters: common in older Cardiff terraces — Pontcanna, Roath, and Canton — with electric storage heating; cheaper off-peak rate applies 23:00–07:00. Smart meters: increasingly common in Cardiff Bay and new developments — enables time-of-use tariffs. Prepayment meters: pay-as-you-go across all CF areas, separate Ofgem cap applies. Utility Warehouse supports all meter types.