As long as we have a daily load curve https://www.iso-ne.com/isoexpress/ I think storage has a lot of use. Far better to generate less power using more efficient baseload power plants 24/7 and store for the daytime peaks. Thursday may be record power demand day this week and as the demand goes up, the less efficient generation will go online to meet the peak. Mass has a "clean peak" standard to deal with the peaks using batteries versus cranking up simple cycle peakers (AKA jets). Even with wire to wire efficiency loss power plants run better at night due to lower ambient temps so best run them to charge up the batteries for daytime use which are less affected by ambient temps.
In the fuel mix chart for Aug 1 2022 Renewables it shows 0% for solar.
Are there no solar farms feeding the NE grid at present?