In a study done by the Environmental Defense Fund, they found that Eversource and Avangrid allegedly colluding with gas companies to create mock shortages and rip off the rate payers.
The utility companies "reserved more natural gas than they needed, especially during the cold winter months, and then dumped the gas too late in the day for power plants to buy it up.
The artificial fuel scarcity drove up energy prices to the tune of $3.6 billion for natural gas and electricity customers over three years, including during the polar vortex in 2013 and 2014, the study finds."
Attorney General Maura Healey is the study which is linkied to a $3.8 Billion scheme. You can read more from the Boston Herald here.