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One of the staff of Dulas Ltd arriving at the office by bicycle. Dulas have a large PV solar panel as the roof of their bike shed that generates electricity for the building. Machynlleth, Powys, Wales.

Dulas, based in mid-Wales, is a 25-year-old employee-owned business. Its work includes include micro-hydro (design and installation); wood-fired heating (design, installation and management) and wind (monitoring and environmental impact assessment, as well as installation of small systems). In solar energy, Dulas installs PV systems in the UK and provides wholesale supplies to other installers, and also supplies about three quarters of the world demand for PV-powered vaccine refrigerators, to organisations such as the WHO and UNICEF.