Mid-range PC (RTX 3070) electricity cost — School-age — 1 h after school (weekdays)
Typical school-age child: 1 hour gaming after school on weekdays. A <strong>Mid-range PC (RTX 3070)</strong> draws 350 W total (GPU 220 W + rest of system 130 W). Cost: 45.7p/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).
Mid-range PC (RTX 3070) — School-age — 1 h after school (weekdays): 0.350 kW × 1 h = 0.350 kWh = 9.1p/session. Weekly (5 sessions): 45.7p. Monthly: £1.98. Annual: £23.76. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).
- Per session
- 9.1p
- Per week (5 sessions)
- 45.7p
- Per month
- £1.98
- Per year
- £23.76
Rig specification
- Tier
- mid-range
- GPU
- Nvidia GeForce RTX 3070
- GPU TDP
- 220 W
- Rest of system
- 130 W
- Total system
- 350 W
- Sessions/week
- 5
Nvidia RTX 3070 TDP 220 W (published spec); rest of system ~130 W mid-range build
How the cost is worked out
- System power: 220 W (GPU) + 130 W (CPU + rest) = 350 W total.
- Per session: 350 W ÷ 1000 × 1 h = 0.350 kWh × 26.11p = 9.1p.
- Weekly: 9.1p × 5 sessions = 45.7p.
- Monthly: 45.7p × 52 ÷ 12 = £1.98.
- Annual: 45.7p × 52 = £23.76.
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.