As competition is introduced across the electric power industry around the
world, market design for the industry is urgently needed to shape its futur
e structure and performance. When generator companies compete with one anot
her in a deregulated market, they may not be willing to share the informati
on needed to perform an economic dispatch of the generation. Using game the
ory, this paper designs a new mechanism that achieves efficiency (economic
dispatch) in spite of this information problem. In this mechanism, when eac
h company acts in the best of its own interest, the outcome is efficient. T
he paper demonstrates the merits of the mechanism by simulations including
the IEEE 14-bus case.