Truthful Production Uncertainty in Electricity Markets: A Two-Stage Mechanism

2026-04-02

AI Summary

This study addresses the inefficiencies in current day-ahead electricity markets, which rely solely on point forecasts of generator output and neglect the inherent uncertainty of renewable generation, thereby failing to internalize balancing costs and leading to higher system-wide expenses and reduced market efficiency. To overcome this limitation, the paper proposes a two-stage market-clearing mechanism: in the day-ahead stage, generators submit probabilistic forecasts of their output, while in the real-time stage, they report actual production. Coupled with an extended Vickrey-Clarke-Groves (VCG) payment rule, this approach uniquely incorporates production uncertainty—represented as full probability distributions—into the day-ahead market design. The mechanism ensures incentive compatibility and individual rationality while substantially enhancing the market’s ability to internalize balancing costs. Case studies demonstrate that the proposed method effectively reduces total system costs, confirming its advantages in both economic efficiency and theoretical soundness.

Abstract

Renewable power sources have low marginal pro-duction costs, but may result in high balancing costs due to the inherent production uncertainty. Current day-ahead markets elicit only point production profiles and neglect the degree of uncertainty associated with each generating asset, preventing the market operator from accounting for balancing costs in day-ahead dispatch and ancillary service procurement. This increases total system costs and undermines market efficiency, especially in renewable-heavy power systems. To address this, we propose a new market clearing paradigm based on a two-stage mechanism, where producers report their production forecast distribution in the day-ahead stage, followed by the realized production in the real-time stage. By extending the Vickery-Clarke-Groves (VCG) payments to the two-stage setting, we show appealing properties in terms of incentive compatibility and individual rationality. An electricity market case study validates the theoretical claims, and illustrates the effectiveness of the proposed mechanism to reduce system costs.

Problem

• production uncertainty
• electricity markets
• balancing costs
• day-ahead markets
• renewable energy

Innovation

• two-stage mechanism
• production uncertainty
• VCG payments
• electricity markets
• incentive compatibility