High-end PC (RTX 4070) electricity cost — Overnight download + idle (8 h)
PC left on overnight for game downloads and background tasks — drawing ~80 W idle draw. Note: this scenario uses idle power, not full TDP. In this idle/download scenario, the PC draws approximately 80 W (not full GPU load). Cost: £1.17/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).
High-end PC (RTX 4070) — Overnight download + idle (8 h): 80 W idle × 8 h = 0.640 kWh = 16.7p/session. Weekly (7 sessions): £1.17. Monthly: £5.07. Annual: £60.83. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).
- Per session
- 16.7p
- Per week (7 sessions)
- £1.17
- Per month
- £5.07
- Per year
- £60.83
Rig specification
- Tier
- high-end
- GPU
- Nvidia GeForce RTX 4070
- GPU TDP
- 200 W
- Rest of system
- 155 W
- Total system
- 355 W
- Sessions/week
- 7
Nvidia RTX 4070 TDP 200 W (published spec); rest of system ~155 W high-end build
How the cost is worked out
- Idle power: PC in idle/download draws approximately 80 W (GPU throttled, fans low).
- Per session: 80 W ÷ 1000 × 8 h = 0.640 kWh × 26.11p = 16.7p.
- Weekly: 16.7p × 7 nights = £1.17.
- Annual: £1.17 × 52 = £60.83.
Same scenario — other gaming rigs
Track gaming PC running costs
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.