Book excerpt: Capacity remuneration mechanisms (or simply capacity mechanisms) have become a fact of life in member states' energy markets and are one of the hottest topics in the wider European regulatory debate. Concerned about the security of electricity supply, national governments are implementing subsidy schemes to encourage investment in conventional power generation capacity, alongside already heavily subsidized renewable energy sources. With the increasingly connected European electricity markets, the introduction of a capacity mechanism in one country not only tends to distort its national market but may also have unforeseeable consequences for neighbouring electricity markets. As these mechanisms are adopted by member states with limited supra-national coordination as well as consideration for the cross-border impact, they tend to cause serious market distortions and put the future of the European internal electricity market at risk. This second edition will take stock of how capacity mechanisms have actually worked so far and consider the consequences they have for the European internal electricity market. It will include a detailed overview of national capacity mechanisms, their implications for the EU internal market, and will outline the nature of market failures which are likely to occur in the European electricity markets. This edition is intended to serve as a point of reference for regulators and policy-makers on how to design optimal capacity mechanisms in Europe. It will be an invaluable resource for anyone interested in energy market design, regulation, and competition issues.