The report examines aspects of the supply and use of energy and the issues which will challenge the engineer over the next 25 years. Conclusions are reached and recommendations are made with particular reference to the United Kingdom while recognizing international implications. Subject matter includes fuel supply and conversion—coal, oil, gas and uranium—and energy usage in the industrial, transport, domestic and commercial sectors. Trends in demand and supply and environmental impact are considered. The report is the product of the Energy Joint Venture Study Group of the UK Engineering Institutions which was formed at the initiative of the Engineering Council. The Institutions contributing are the IMechE, CIBSE, BNES, Institute of Energy, IEE, Institute of Civil Engineers, Institute of Measurement and Control, Institute of Mining Engineers, Institute of Road Transport Engineers, Institute of Materials, IChemE and the Institute of Gas Engineers.