A range of major risks associated with a rapidly changing United Kingdom (UK) electricity sector have been identified and quantified with the aid of various stakeholder groups (academic researchers, civil servants, electricity companies, green groups, power system engineers, and various others), who completed an online internet questionnaire. Each stakeholder ranked potential risks according to the perceived severity of impact and likelihood of occurrence using a three-point scale. The data were then used to perform a ranking of the risks by multiplying scores for impact and occurrence. There was some variation between the different stakeholder groups, but similar risks were ranked highly by each group. The main risks were identified as being energy security issues (the highest score), lack of investment in new infrastructure, the closure ofold coal and nuclear plants leading to reduced network capacity, severe weather events, and inadequate spare capacity margins generally. The trial illustrates the potential of using risk assessment techniques to evaluate developing risks to the UK power landscape. Clearly such an exercise would need to be carried out periodically if it were to maintain its value to the industry, its stakeholders, and to policy makers.