Stori Traws is about the social as well as the technological impact of one of the largest industrial developments seen in North Wales during the last 50 years. It is an impressive story of innovation and engineering on a grand scale encompassing the three main phases of Trawsfynydd Power Station’s lifetime: construction, power production and decommissioning. Now, as work on site is approaching its final stages, an imaginative programme is underway as part of the Trawsfynydd Heritage Strategy to safeguard this unique aspect of our industrial and social history by preserving documents, photographs, and the taped memories of former workers etc. for the future. Nuclear power production though is only one part of the story of electricity generation in the area. Our timeline starts with the production and use of electric power in local quarries in the Victorian period, early hydro-electric schemes, establishing local supply networks, the National Grid, the advent of nuclear power, pump storage schemes and the recent revival in interest in micro-generation and concludes with a look to what the future might hold. Interwoven with this story of technological revolution is the social and economic impact of such a large development as Trawsfynydd power station and the domestic transformation which followed the coming of power to people’s homes.