Lights on in daylight cost money and nobody reports them.
Learning Track · Module 4: Energy and carbon · Step 24 of 101
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- A photocell that is dirty, broken, or failed “on”.
- A controller clock with the wrong time, time zone, or location.
- A contactor stuck closed.
- A manual bypass switch left on.
2.0 kW × 3.5 h extra × 365 days = 2,555 kWh per year
Europe: 2,555 kWh × €0.20 ≈ €510 per year Middle East: 2,555 kWh × AED 0.40 ≈ AED 1,020 per year South Asia: 2,555 kWh × ₹8 ≈ ₹20,400 per year USA: 2,555 kWh × $0.13 ≈ $330 per year
Europe: 2,555 kWh × €0.20 ≈ €510 per year Middle East: 2,555 kWh × AED 0.40 ≈ AED 1,020 per year South Asia: 2,555 kWh × ₹8 ≈ ₹20,400 per year USA: 2,555 kWh × $0.13 ≈ $330 per year
Compare the switch-off time of each circuit with sunrise every day, and switch-on with sunset.
Sources
- EN 13201-5 Energy performance indicators
- IPMVP (Efficiency Valuation Organization)
- GHG Protocol Scope 2 Guidance
Changes: 30 October 2026: First publication: guides for Europe, the Middle East, South Asia, and the USA; failure library; tender clause library; comparisons; tools; downloads. See the changelog. Found a mistake? Report it.