Environment Canada has issued new regulations aimed at controlling carbon dioxide (CO2) emissions from coal-fired electricity plants. The final standard establishes an annual average limit of 420 tons of CO2 per gigawatt generated, allowing more CO2 emissions than a proposed 375 tons per gigawatt limit that raised questions among industry stakeholders about whether compliance would be possible. The standard applies immediately to new generating facilities, while existing generators have 34 months to achieve compliance. The rule also extends the allowable useful life of coal-fired plants from 45 to 50 years.