The ISO-NE Electric Grid serves six Northeast States including New Hampshire. In the past twenty years, natural gas and nuclear energy have fully replaced, not temporarily displaced, coal and oil with the exception of extreme cold snaps when oil is sparingly used.

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So, emission reductions for the ISO-NE Grid have been a spectacular 73% in a bit less than two decades. ISO-NE says:  "The biggest emission reduction contributor has been the region's shift to lower-emitting natural gas fired generation."

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What role have low capacity-non dispatchable sources like industrial scale wind and utility scale solar played in the ISO's stellar emission reduction?  Very little as we read the ISO-NE and EIA data. Wind supplies 4% of the generation on the ISO grid. Solar supplies even less. 

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During the entire time wind is on the grid, spinning gas turbines must run to account for fluctuations or the loss of wind entirely. {ISO-NE Wind Integration Study (NEWIS)}

Since wind does not ever supply dispatchable baseload power, the more wind the grid has, the more reserve natural gas capacity the grid needs for periods when there is little or no wind output. {ISO-NE Wind Integration Study}. The advent of giant lithium batteries may help, but the complexity to scale to grid levels is quite significant.

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 Further, wind does not correlate well with grid demand and generally requires expensive transmission. {ISO-NEWIS} 

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Any and all statements above come from our careful reading of IS0-NE data and fact-driven research. For more information, please see the ISO-NE web site here