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Aux États-Unis, plusieurs mesures de réglementation viennent limiter les concentrations de mercure, de dioxyde de soufre, d’oxyde nitreux et d’autres polluants émis par les centrales au charbon. Citons les normes nationales américaines sur la qualité de l’air ambiant, le mercure et les toxiques atmosphériques, le mercure dans l’atmosphère (« Clean Air Mercury Rules ») et la dépollution de l’air entre les États (« Clean Air Interstate Rules »).
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On a percentage basis, non-hydro renewables such as wind, solar and biomass have been the fastest growing source of generation in both countries. Government incentives, such as federal tax credits and state-level policies in the U.S. and renewable energy targets and standards in Canada, contributed to this growth. Between 2005 and 2012, wind and solar generation increased sevenfold in the U.S. and generation from all non-hydro renewables almost doubled in Canada. Consequently, the share of generation produced from non-hydro renewable sources in 2012 reached three per cent in Canada and five per cent in the U.S.
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