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Mass. to lower cap on emissions by power plants

Massachusetts and eight other Northeast states are slashing by nearly half the amount of carbon dioxide power plants are allowed to emit — a dramatic reduction that is expected to bring in hundreds of millions of dollars to the state for energy efficiency programs while combating global warming.

In announcing the decision Thursday, the states said consumers and businesses should, on balance, see a negligible impact on their electricity bills when the new limits go into effect next year. The biggest impact will be reductions in greenhouse gases — and residents will get financial help making their homes weathertight.

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