A three bedroom house which costs £75,000 to build and will have no gas or electricity bills will be unveiled later today.
The company behind it, Western Solar Ltd, claims the cost of the build will also be recouped as the homes will generate £1,000 worth of excess electricity each year.
The low cost home which has been built in Pembrokeshire will initially only be constructed for Welsh housing associations.
Western Solar, which is based near Cardigan, says there is a long waiting list for the homes but they do plan on building a village of them in the near future.
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Sunny spells during the evening with isolated showers easing away, although it will cool off quite quickly.