Construction, design, installation, maintenance and repair of electrical power systems for residential or commercial buildings, alternative power systems for residential or commercial buildings including solar power systems, thermal and wind powered systems, and machinery or electrical systems relating to power systems installed in residential or commercial buildings; project preparation relating to installation of electrical power systems including solar power systems in residential or commercial buildings; construction, design, installation, maintenance and repair of residential solar power systems including for very low energy use homes or buildings; provision of solar powered energy installations for residential or commercial buildings; provision of information or advisory and consultancy service on any of the foregoing; and none of the foregoing relating to power plants, treatment of materials or geo-sequestration