This study examines the hypothesis that changes to high-powered incentive regulations have a positive efficiency and productivity growth effects in a regulated electricity distribution industry. We estimate an input distance function using the stochastic frontier analysis method to compute technical efficiency scores for 121 Norwegian utilities over the period 2004-2012. We explore sources of productivity growth by parametrically decomposing the Malmquist productivity index into efficiency change, technical change, and scale change. Unlike previous studies, we examine the difference in performance across two regulatory regimes: yardstick competition (2007-2012) and RPI-X incentive regulation (2004)(2005)(2006). Results show significant efficiency and productivity growth improvements with embodied technical change as the main driver.

This paper surveys theory and practice on how a larger and integrated energy market can propel electricity trading through economies of scale. We make a systematic presentation of theories and methods used by various scholars to generate knowledge on integrated electricity markets. We discuss paradigms, concepts, and practices emanating from the complex topic of a unified electricity market with an intent to identify gaps. We conclude that electricity trading in EMI has a propensity to drive both economic integration and sustainable energy access; that crafting ways and means for integrating cross-border systems without sacrificing the local economy could make the idea of EMI more palatable to partner countries; and that adoption of ex ante studies that are non-data oriented could improve the design of upcoming regional electricity markets.

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