Twenty years of liberalization have transformed the energy sector. The old energy world of long-term contracts and personal contacts has changed beyond recognition into a set of highly competitive markets with instantaneous decision-making much like the financial sector. Decentralised decision-making by multiple actors creates the necessary environment for applying econometric techniques. More importantly, the complexity and volatility of these new markets create strong demand for quantitative analysis and, in particular, econometric techniques. Written jointly by energy economists and econometricians, this books offers an introduction to the state of the art in econometric modelling applied to the most pertinent issues in today's energy markets.