People who heat their homes with natural gas in Massachusetts could be paying less this winter than last.

Berkshire Gas customers could be paying about $22 a month less while Columbia Gas users are in line for about a $30 drop from last winter. While both companies point to an increase of supply as a factor for lower rates, Columbia Gas also points to corrections from last year’s bills. All rate changes still must be approved by state regulators.

Despite the supply projections, both utility companies still have moratoriums on new gas service in effect for some Pioneer Valley communities. A Berkshire Gas spokesperson says his company’s freeze on new service is a separate issue, tied to pipeline capacity