In MA natural gas is the predominant prime mover for smaller article 700 loads.
In June I traveled through CT, NY, RI, NY and NJ connecting Article 700 Gen Sets to off site monitoring and out of the approx 100 sites I visited everyone was Natural gas.
Typically the diesel sets we install are for optional standby loads or very large article 700 loads.
Bob
Bob Badger Construction & Maintenance Electrician Massachusetts