How much does energy consumption cost?
Continuing the discussion from Electricity base load:
We can use this to estimate the cost of the Queens baseload
The Queens building uses 80kW of electricity 24 hours a day, 365 days a year. Non-stop. All the time. In fact, currently it looks like were closer to 100kW.
The cost of each kW of baseload can be calculated as follows
day rate = 9.417 * 1.1865 + 0.86 = 12.03p/kWh
night rate = 6.384 * 1.1865 + 0.86 = 8.43p/kWh
daily cost per kW = 7h @ 8.43p/kWh + 17h @ 12.03p/kWh = £2.64/kW
That's a daily cost per kW of about £2.64 (a little higher than the 10p average price per unit I estimated).
Every kW of baseload costs £2.64 * 365 = £962.17 per year
In Queens the baseload is about 80kW running 24 hours a day, 365 days a year.
total cost of baseload in Queens = 80kW * 365 days * £2.64/day = £76,973.51 per year
If we stick at 100kW then this increases to £96,216.89 per year
There are many cases (for example this) where massive savings can be made on overnight consumption. Most of this will probably be unavoidable but if we knew what it was we might be able to save something like 15% of it that would save £10,000 per year on Queens baseload alone.
The calculation is simplified by assuming an annual cost of £1000 per kW of baseload.
The five DMU buildings each have very similar baseload consumption.
- Hugh Aston - 100kW - ~£100,000
- Queens - 80kW - ~£80,000
- John Whitehead - 80kW (includes server rooms) - ~£80,000
- Campus Centre - 90kW - ~£90,000
- Kimberlin Library - 25kW overall baseline (but higher in the week) - ~£50,000
Total cost of baseload in five buildings: ~£400,000 per annum
This is a huge opportunity.