In most liberalised electricity retail markets, incumbent firms still hold the majority of residential
consumers. This situation focused the attention of regulatory institutions and energy economists on the
determinants of consumers switching decisions. Fewer studies have, however, been devoted to measuring
switching costs. In the present paper we calculate these costs in the Great Britain electricity retail market
by revisiting the model suggested in Shy, O. (2002), A quick-and-easy method for estimating switching
costs, International Journal of Industrial Organization, 20, pp. 71–87. The average net cost of switching regional
incumbents is €385 while the net cost of switching back to them is negative for customers on standard
credit or direct debit plans but positive for prepayment customers
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