Redispatch index for assessing bidding zone delineation
Résumé
This paper addresses the problem of assessing to which extent a bidding zone delineation
requires redispatching actions after the clearing of energy markets. Such issue arises in particular
when policy makers review the organisation of electricity markets and question the design of
uniform price zones. To avoid relying on arbitrarily-defined sensitive parameters, we propose a
metrics based on information that is sufficient to perform nodal pricing for the whole region under
consideration. The metrics is illustrated with a realistic model of the West-European power
system considering two application cases, namely i) selecting a clustering technique to define candidate
bidding zones, and ii) selecting candidate splitting and merging options for pre-existing
bidding zones. Results show that the proposed index provides a consistent order of magnitude of
the redispatching needs subsequent to market clearing, although it requires no specific user-defined
parameters.