In the development of any new energy project, alternative schemes that meet overall project goals are usually feasible. Like any others, renewable energy and energy efficiency schemes must be evaluated against a range of criteria in order to select the most appropriate for development. Appraisal of Renewable Energy and Energy Efficient Projects deals with such evaluations, illustrating appraisal against economic and financial measures as well as non-economic measures. The most important technologies are first described, stressing the economic and performance characteristics which influence project performance. A short description of the operation of common energy markets is also included, so that projects can be put into context and cash flows estimated. Key project appraisal concepts are then introduced, approaches to modelling the cash flows in energy projects are described, and the issues of uncertainty and optimisation are fully discussed. All aspects illustrated with a number of current case studies.