Computer Laboratory

Gates Building Energy Use


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Units and Costs

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Fridge Raw Data

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Units & Costs

We present energy consumption as instantaneous power, in kilowatts (kW). These are actually based on hourly readings; we can in principle go for much finer time granularity. Often electricity consumption is presented in terms of total energy, i.e. kilowatt hours (kW hr), but presenting this as a time series would just get us back to kilowatt hours per hour, that is, kilowatts.

If it helps:

  • A constant consumption of 1 watt over a year is 8.76 kW hr (call it 10 for convenience).
  • In the UK electricity prices range around 10 pence per kilowatt hour.
  • Thus one watt constant for a year is around a pound sterling (and 100 kW constant is £100,000 per year).