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Gaming PC · Ofgem 1 July to 30 September 2026

Ultra PC (RTX 4090) electricity cost — Casual — 1 hour per session

Light casual gaming: one hour a session, three times a week. A <strong>Ultra PC (RTX 4090)</strong> draws 675 W total (GPU 450 W + rest of system 225 W). Cost: 52.9p/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).

Ultra PC (RTX 4090)Casual — 1 hour per session: 0.675 kW × 1 h = 0.675 kWh = 17.6p/session. Weekly (3 sessions): 52.9p. Monthly: £2.29. Annual: £27.49. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).

Per session
17.6p
Per week (3 sessions)
52.9p
Per month
£2.29
Per year
£27.49

Rig specification

Tier
ultra
GPU
Nvidia GeForce RTX 4090
GPU TDP
450 W
Rest of system
225 W
Total system
675 W
Sessions/week
3

Nvidia RTX 4090 TDP 450 W (published Nvidia spec); rest of system ~225 W ultra build with i9-14900K (125 W TDP) + PSU/fans

How the cost is worked out

  1. System power: 450 W (GPU) + 225 W (CPU + rest) = 675 W total.
  2. Per session: 675 W ÷ 1000 × 1 h = 0.675 kWh × 26.11p = 17.6p.
  3. Weekly: 17.6p × 3 sessions = 52.9p.
  4. Monthly: 52.9p × 52 ÷ 12 = £2.29.
  5. Annual: 52.9p × 52 = £27.49.

Same scenario — other gaming rigs

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Updated each time the Ofgem cap changes.

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GPU TDP from Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components. Unit rate 26.11p/kWh from Ofgem — Energy price cap unit rates and standing charges (1 July to 30 September 2026), OGL v3.0. Last updated: 2026-06-20.