The home has a built in photovoltaic power supply, which uses sunlight to generate electricity.
The company behind the project says the house produces excess energy that can be fed back into the electricity grid, potentially earning its occupants up to £1,000 a year.
- The windows are triple-glazed. The house is thoroughly insulated through out and features low-power LED lighting.
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Plenty of fine dry weather to come today and prolonged spells of sunshine. A cool easterly breeze will take the edge off the temperatures.
The three-day event in the Welsh capital is expected to attract more than 20,000 visitors.
Steve Ashton's picture of a jacket potato and corned beef served to his 81-year-old mother has been shared 130,000 times on Facebook.