Revisiting the Merit-Order Effect of Renewable Energy Sources

TL;DR

This paper examines the impact of renewable energy sources on energy markets, arguing that market distortions, not the renewable feed-in itself, threaten market stability, and suggests regulatory adjustments to maintain market functionality.

Contribution

It demonstrates that market distortions over-amplify the merit-order effect of RES and proposes regulatory reforms to ensure market stability with high RES integration.

Findings

Market distortions over-amplify RES merit-order effect

Regulatory adjustments can maintain market stability

High RES feed-in does not inherently cause market failure

Abstract

An on-going debate in the energy economics and power market community has raised the question if energy-only power markets are increasingly failing due to growing feed-in shares from subsidized renewable energy sources (RES). The short answer to this is: No, they are not failing. Energy-based power markets are, however, facing several market distortions, namely from the gap between the electricity volume traded at day-ahead markets versus the overall electricity consumption as well as the (wrong) regulatory assumption that variable RES generation, i.e., wind and photovoltaic (PV), truly have zero marginal operation costs. In this paper we show that both effects over-amplify the well-known merit-order effect of RES power feed-in beyond a level that is explainable by underlying physical realities, i.e., thermal power plants being willing to accept negative electricity prices to be able to stay online due to considerations of wear & tear and start-stop constraints. We analyze the impacts of wind and PV power feed-in on the day-ahead market for a region that is already today experiencing significant feed-in tariff (FIT)-subsidized RES power feed-in, the EPEX German-Austrian market zone ($\approx\,$20% FIT share). Our analysis shows that, if the necessary regulatory adaptations are taken, i.e., increasing the day-ahead market's share of overall load demand and using the true marginal costs of RES units in the merit-order, energy-based power markets can remain functional despite high RES power feed-in.