Reduced Electricity Consumption

The building is full of energy-efficient lighting. At least 50% of the light comes from ‘eco’ T5 fluorescent lighting, based on the GE(US) Wattmiser technology and with a luminous efficacy of just over 100 lumens per watt. 50% comes from compact fluorescent lamps and light emitting diodes (LEDs). These offer an efficacy of 50-60 lumens/watts (lm/W) averaged over their lifespan.

Soon, LEDs should offer an efficacy of over 100 lm/W and a colour rendering index as good as halogen lamps or full-spectrum fluorescent lamps. We have not quite reached this point yet, though.

Electricity consumption for lighting is cut by 82% compared to a normal house. It will drop by 88% once LEDs improve in energy efficiency and light quality / colour rendering to T5s now.

All donations are very much appreciated. Thank you. This project has been undertaken without UK government or EU funding.

led light

LED 'light bulb'.
Picture © www.topten.ch.

Very energy-efficient domestic appliances are in use. The anticipated result is:

Total electricity consumption for domestic purposes = 900 to 1,000 kWh per year (kWh/y),
costing around £180/year at today's prices;
Electricity generated from a small solar PV system of only 1.2 kW = 1,020 kWh/y
supplies as much electricity as the house consumes.

An example of high energy efficiency is the refrigerator-freezer which will be installed shortly in the house. It consumes 121 kWh/y. A UK refrigerator-freezer bought in the last ten years typically consumed 350 to 500 kWh/year.

Fridge/Freezer

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Reduced Electricity Consumption

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Except where otherwise stated, material on this website is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives4.0 International License.

You may copy and share the material with full attribution but you may not alter it, sell it or use it commercially. If you are in any doubt, please contact the copyright holder first.

Reduced Electricity Consumption

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All material on this website © EAA 2015 onwards.

Except where otherwise stated, material on this website is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives4.0 International License.

You may copy and share the material with full attribution but you may not alter it, sell it or use it commerc­ially. If you are in any doubt, please contact the copyright holder first.

You may copy and share the material with full attribution but you may not alter it, sell it or use it commercially. If you are in any doubt, please contact the copyright holder first.