Recent market convulsions in the energy industry have generated a plethora of post-mortem analyses on a wide range of issues, including accounting rules, corporate governance, commodity markets, and energy policy. While most of these analyses have focused on business practices related to wholesale energy trading, there has been limited analysis of retail energy services, particularly energy efficiency projects. We suggest that there were several business concepts and strategies in the energy efficiency arena whose inherent value may have been masked by the larger failure of companies such as Enron. In this paper, we describe one such concept, namely, actuarial pricing of energy efficiency projects, which leverages a portfolio-based approach to risk management. First, we discuss the business drivers, contrasting this approach with conventional industry practice. We then describe the implementation of this approach, including an actuarial database, pricing curves, and a pricing process compatible with commodity pricing. We conclude with a discussion of the prospects and barriers for the further development of transparent and quantifiable risk management products for energy efficiency, a prerequisite for developing energy efficiency as a tradeable commodity. We address these issues from an experiential standpoint, drawing mostly on our experience in developing and implementing such strategies at Enron. (c) 2004 Elsevier Ltd. All rights reserved.