Maura Healey says utility companies operating in Massachusetts have agreed to waive all interest charges on rate deferrals offered as part of her initiative to lower electric and gas bills in February and March. The governor’s office said National Grid, Eversource, Berkshire Gas and Unitil have all agreed to waive all interest charges related to the rate deferrals — following the push from Healey. That’s why I acted to get $180 million off winter electric bills and called on the utilities to help provide immediate relief — including waiving interest charges,” Healey said. “After seeing what they proposed, I again called on the utilities today to waive interest charges and they have agreed. Berkshire Gas says it worked collaboratively with the governor’s office, agreeing to waive the interest charges following Healey’s demands.