Before introducing capacity mechanisms, governments should consider their impact on incentives and define common rules on a market-wide basis. They are quite heavy-handed administrative interventions which may ultimately lead to re-regulating many parameters of electricity markets. Their introduction can be motivated by a lack of trust in energy-only markets or poorly designed electricity markets. However, capacity markets involve very technical discussions, still ongoing, about the incentives and their expected effects. Price restrictions or regulatory opportunism: governments anticipate that they will not let electricity prices go high enough during periods of scarcity.