The Commonwealth of Massachusetts recently passed a climate bill that sets a target of net-zero emissions for the state by the year 2050. The bill is one of several successful legislative efforts in Northeastern states to reduce greenhouse gas emissions by as much as 80 to 100 percent by mid-century. To achieve these ambitious targets — which align with the Paris Agreement’s long-term goal of keeping global warming well below 2 degrees Celsius to avoid the worst impacts of climate change — will require a significant ramp-up of zero-carbon, intermittent,…