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Vertical Integration and Market Power in Electricity Markets

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dc.contributor.author Hogan, Seamus
dc.contributor.author Meade, Richard
dc.date.accessioned 2015-02-11T21:39:01Z
dc.date.accessioned 2022-07-06T22:45:01Z
dc.date.available 2015-02-11T21:39:01Z
dc.date.available 2022-07-06T22:45:01Z
dc.date.copyright 18/02/2007
dc.date.issued 2007
dc.identifier.uri https://ir.wgtn.ac.nz/handle/123456789/19052
dc.description.abstract Vertical separation of generation from electricity retailing has often been required as a condition of electricity market liberalisation. A well-developed and liquid contracts market is similarly suggested as necessary to manage the resulting wholesale market risks which risks are further exacerbated by competition. Such contracts markets are rare however and increasingly evidence is emerging that vertical integration is associated not just with improved wholesale market risk management but also reduced wholesale market power. This paper develops a theoretical model showing that non-vertically integrated generators will over-report their inverse supply curves with the incentive to over-report increasing with the firm's share of generating capacity. Conversely in a vertically integrated industry no over-reporting occurs when integrated firms have balanced shares in wholesale and retail markets. In general firms whose share of generating capacity is higher (lower) than their retail market share will over-report (under-report) their inverse supply functions. Integration is found to affect retail electricity prices only via its effect on retail marginal costs. We find that retail prices are higher with vertical separation than with either balanced integration or full integration without a wholesale market. These results suggest a re-evaluation of the importance of generator wholesale market power in vertically integrated electricity industries and of measures to improve retail market competitiveness under either vertical integration or separation. en_NZ
dc.format pdf en_NZ
dc.language.iso en_NZ
dc.publisher Te Herenga Waka—Victoria University of Wellington en_NZ
dc.rights Permission to publish research outputs of the New Zealand Institute for the Study of Competition and Regulation has been granted to the Victoria University of Wellington Library. Refer to the permission letter in record: https://ir.wgtn.ac.nz/handle/123456789/18870 en_NZ
dc.title Vertical Integration and Market Power in Electricity Markets en_NZ
dc.type Text en_NZ
vuwschema.contributor.unit New Zealand Institute for the Study of Competition and Regulation en_NZ
vuwschema.contributor.unit Victoria Business School: Orauariki en_NZ
vuwschema.subject.anzsrcfor 149999 Economics not elsewhere classified en_NZ
vuwschema.type.vuw Working or Occasional Paper en_NZ
vuwschema.subject.anzsrcforV2 389999 Other economics not elsewhere classified en_NZ

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