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Cost of Gas Adjustment Factor Rates and Information

The gas supply rate, or Cost of Gas Adjustment factor (GAF), and the Local Distribution Adjustment factor (LDAF) are semiannual rates charged by regulated Massachusetts gas companies.

Table of Contents

Gas Supply Rate/GAF Information

The cost of gas adjustment factor, or GAF, is the rate charged by gas companies to recover the cost to buy and transport gas supply to Massachusetts.  

GAF Rate Schedule

Peak period (or winter) rate: November 1 through April 30.

Off-peak period (or summer) rate: May 1 through October 31.

GAF Revisions

A gas company may, at any time, submit an amended GAF filing to the Department of Public Utilities (DPU). The gas company must submit the amended GAF filing 7 business days before the first billing cycle of the month in which the new rate would take effect.  220 CMR 6.12. If the DPU approves the amended GAF, we will post an update to this page and label the gas company's GAFs as REVISED.

LDAF Rate Information

The local distribution adjustment factor, or LDAF, is the rate charged by gas companies to recover costs related to:

For company-specific delivery rate information, including revenue decoupling, go to the DPU's Delivery Rates and Tariffs page.

Historical GAF/LDAF rates and data

For current docket information in the DPU Fileroom, click on the applicable Company listed below.

For GAF and LDAF rates in effect before the 2021 off-peak period, please download the GAF Historical Data Workbook.

Off-Peak 2021 Rates (Effective 5/1/21 through 10/31/21)

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.3647 0.2942
G-41/G-51 $/Therm 0.3647 0.1415
G-42/G-52 $/Therm 0.3647 0.1128
G-43/G-53 $/Therm 0.3647 0.0900
T-54 $/Therm 0.3647 0.0257

 

Eversource Gas Company of Massachusetts (formerly Bay State Gas d/b/a Columbia Gas of Massachusetts)1

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.3894 0.3650
Residential Heating R-3, R-4 $/Therm 0.4293 0.3650
G-40 $/Therm 0.4293 0.2447
G-41 $/Therm 0.4293 0.1604
G-42 $/Therm 0.4293 0.1396
G-43 $/Therm 0.4293 0.1193
G-50 $/Therm 0.3894 0.2447
G-51 $/Therm 0.3894 0.1604
G-52 $/Therm 0.3894 0.1396
G-53 $/Therm 0.3894 0.1193
1On October 7, 2020, the Department approved a Settlement Agreement authorizing the sale of Bay State Gas to Eversource Energy.  Eversource Energy/Bay State Gas Company Merger, D.P.U. 20‑59 (October 7, 2020).  The sale closed on October 9, 2020.  The name for Bay State Gas/Columbia Gas of Massachusetts is now Eversource Gas Company of Massachusetts.

 

Fitchburg Gas d/b/a Unitil

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.3775 0.5320
Residential Heating R-3, R-4 $/Therm 0.3937 0.5320
G-41 $/Therm 0.3937 0.4167
G-42 $/Therm 0.3937 0.2612
G-43 $/Therm 0.3937 0.2074
G-51 $/Therm 0.3775 0.4167
G-52 $/Therm 0.3775 0.2612
G-53 $/Therm 0.3775 0.2074

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)2

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4267 0.3337
Residential Heating R-3, R-4 $/Therm 0.4267 0.3258
G-41, G-42, G-43 $/Therm 0.4267 0.1590
G-51, G-52, G-53 $/Therm 0.4267 0.1191
2On October 13, 2020, the Department approved the acquisition of Blackstone Gas Company by Liberty Utilities.  Petition of Liberty Utilities for approval by the Department of Public Utilities, pursuant to G.L. c. 164, § 96, of the acquisition of Blackstone Gas Company, D.P.U. 20-03, at n.5 (October 13, 2020).  The acquisition closed on December 31, 2020.  The name for Blackstone Gas Company is now Liberty Utilities.

 

Liberty Utilities - North Attleboro/Fall River

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2300 0.4296
G-41, G-42, G-43 $/Therm 0.2300 0.2868
G-51, G-52, G-53 $/Therm 0.2300 0.2191

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.3895 0.3215
G-41B/E, G-51B/E $/Therm 0.3895 0.1679
G-42B/E, G-52B/E $/Therm 0.3895 0.1644
G-43B/E, G-53B/E $/Therm 0.3895 0.1513
G-44B, G-54B $/Therm 0.2720 0.1349
G-44B, G-54B $/MDCQ 1.1883  

National Grid - former Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.3848 0.2740
G-41, G-51 $/Therm 0.3848 0.1181
G-42, G-52 $/Therm 0.3848 0.1089
G-43, G-53 $/Therm 0.3848 0.1043

NSTAR Gas Company d/b/a Eversource Energy

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.3616 0.3174
G-41, G-51 $/Therm 0.3616 0.1470
G-42, G-52 $/Therm 0.3616 0.1292
G-43, G-53, T-1 $/Therm 0.3616 0.0990

 

Peak Period 2020-2021 Rates Revision 5 (Effective 4/1/21 through 4/30/21)

Eversource Gas Company of Massachusetts (formerly Bay State Gas d/b/a Columbia Gas of Massachusetts)1

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.3988 0.3265
Residential Heating R-3, R-4 $/Therm 0.5149 0.3265
G-40 $/Therm 0.5149 0.1939
G-41 $/Therm 0.5149 0.1344
G-42 $/Therm 0.5149 0.1194
G-43 $/Therm 0.5149 0.1042
G-50 $/Therm 0.3988 0.1939
G-51 $/Therm 0.3988 0.1344
G-52 $/Therm 0.3988 0.1194
G-53 $/Therm 0.3988 0.1042
1On October 7, 2020, the Department approved a Settlement Agreement authorizing the sale of Bay State Gas to Eversource Energy.  Eversource Energy/Bay State Gas Company Merger, D.P.U. 20‑59 (October 7, 2020).  The sale closed on October 9, 2020.  The name for Bay State Gas/Columbia Gas of Massachusetts is now Eversource Gas Company of Massachusetts.

 

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.6078 0.2778
G-41/G-51 $/Therm 0.6078 0.1272
G-42/G-52 $/Therm 0.6078 0.1016
G-43/G-53 $/Therm 0.6078 0.0809
T-54 $/Therm 0.6078 0.0235

Fitchburg Gas d/b/a Unitil REVISED

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.6946 0.5043
Residential Heating R-3, R-4 $/Therm 0.7432 0.5043
G-41 $/Therm 0.7432 0.3798
G-42 $/Therm 0.7432 0.2425
G-43 $/Therm 0.7432 0.1942
G-51 $/Therm 0.6946 0.3798
G-52 $/Therm 0.6946 0.2425
G-53 $/Therm 0.6946 0.1942

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)2

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4023 0.3337
Residential Heating R-3, R-4 $/Therm 0.4023 0.3258
G-41, G-42, G-43 $/Therm 0.4023 0.1590
G-51, G-52, G-53 $/Therm 0.4023 0.1191
2On October 13, 2020, the Department approved the acquisition of Blackstone Gas Company by Liberty Utilities.  Petition of Liberty Utilities for approval by the Department of Public Utilities, pursuant to G.L. c. 164, § 96, of the acquisition of Blackstone Gas Company, D.P.U. 20-03, at n.5 (October 13, 2020).  The acquisition closed on December 31, 2020.  The name for Blackstone Gas Company is now Liberty Utilities.

 

Liberty Utilities - North Attleboro/Fall River

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.4547 0.3824
G-41, G-42, G-43 $/Therm 0.4547 0.2576
G-51, G-52, G-53 $/Therm 0.4547 0.1930

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5867 0.2991
G-41B/E, G-51B/E $/Therm 0.5867 0.1536
G-42B/E, G-52B/E $/Therm 0.5867 0.1500
G-43B/E, G-53B/E $/Therm 0.5867 0.1380
G-44B, G-54B $/Therm 0.2757 0.1277
G-44B, G-54B $/MDCQ 3.7847  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5826 0.2702
G-41, G-51 $/Therm 0.5826 0.1229
G-42, G-52 $/Therm 0.5826 0.1107
G-43, G-53 $/Therm 0.5826 0.1007

NSTAR Gas Company d/b/a Eversource Energy

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.6946 0.3371
G-41, G-51 $/Therm 0.6946 0.1565
G-42, G-52 $/Therm 0.6946 0.1375
G-43, G-53, T-1 $/Therm 0.6946 0.1056

 

Peak Period 2020-2021 Rates Revision 4 (Effective 3/1/21 through 3/31/21)

Eversource Gas Company of Massachusetts (formerly Bay State Gas d/b/a Columbia Gas of Massachusetts)1

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.3988 0.3265
Residential Heating R-3, R-4 $/Therm 0.5149 0.3265
G-40 $/Therm 0.5149 0.1939
G-41 $/Therm 0.5149 0.1344
G-42 $/Therm 0.5149 0.1194
G-43 $/Therm 0.5149 0.1042
G-50 $/Therm 0.3988 0.1939
G-51 $/Therm 0.3988 0.1344
G-52 $/Therm 0.3988 0.1194
G-53 $/Therm 0.3988 0.1042
1On October 7, 2020, the Department approved a Settlement Agreement authorizing the sale of Bay State Gas to Eversource Energy.  Eversource Energy/Bay State Gas Company Merger, D.P.U. 20‑59 (October 7, 2020).  The sale closed on October 9, 2020.  The name for Bay State Gas/Columbia Gas of Massachusetts is now Eversource Gas Company of Massachusetts.

 

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.6078 0.2778
G-41/G-51 $/Therm 0.6078 0.1272
G-42/G-52 $/Therm 0.6078 0.1016
G-43/G-53 $/Therm 0.6078 0.0809
T-54 $/Therm 0.6078 0.0235

Fitchburg Gas d/b/a Unitil REVISED

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4807 0.5043
Residential Heating R-3, R-4 $/Therm 0.5293 0.5043
G-41 $/Therm 0.5293 0.3798
G-42 $/Therm 0.5293 0.2425
G-43 $/Therm 0.5293 0.1942
G-51 $/Therm 0.4807 0.3798
G-52 $/Therm 0.4807 0.2425
G-53 $/Therm 0.4807 0.1942

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)2

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4023 0.3337
Residential Heating R-3, R-4 $/Therm 0.4023 0.3258
G-41, G-42, G-43 $/Therm 0.4023 0.1590
G-51, G-52, G-53 $/Therm 0.4023 0.1191
2On October 13, 2020, the Department approved the acquisition of Blackstone Gas Company by Liberty Utilities.  Petition of Liberty Utilities for approval by the Department of Public Utilities, pursuant to G.L. c. 164, § 96, of the acquisition of Blackstone Gas Company, D.P.U. 20-03, at n.5 (October 13, 2020).  The acquisition closed on December 31, 2020.  The name for Blackstone Gas Company is now Liberty Utilities.

 

Liberty Utilities - North Attleboro/Fall River

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.4547 0.3824
G-41, G-42, G-43 $/Therm 0.4547 0.2576
G-51, G-52, G-53 $/Therm 0.4547 0.1930

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5867 0.2991
G-41B/E, G-51B/E $/Therm 0.5867 0.1536
G-42B/E, G-52B/E $/Therm 0.5867 0.1500
G-43B/E, G-53B/E $/Therm 0.5867 0.1380
G-44B, G-54B $/Therm 0.2757 0.1277
G-44B, G-54B $/MDCQ 3.7847  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5826 0.2702
G-41, G-51 $/Therm 0.5826 0.1229
G-42, G-52 $/Therm 0.5826 0.1107
G-43, G-53 $/Therm 0.5826 0.1007

NSTAR Gas Company d/b/a Eversource Energy

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.6946 0.3371
G-41, G-51 $/Therm 0.6946 0.1565
G-42, G-52 $/Therm 0.6946 0.1375
G-43, G-53, T-1 $/Therm 0.6946 0.1056

 

Peak Period 2020-2021 Rates Revision 3 (Effective 2/1/21 through 2/28/21)

Eversource Gas Company of Massachusetts (formerly Bay State Gas d/b/a Columbia Gas of Massachusetts)1 REVISED

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.3988 0.3265
Residential Heating R-3, R-4 $/Therm 0.5149 0.3265
G-40 $/Therm 0.5149 0.1939
G-41 $/Therm 0.5149 0.1344
G-42 $/Therm 0.5149 0.1194
G-43 $/Therm 0.5149 0.1042
G-50 $/Therm 0.3988 0.1939
G-51 $/Therm 0.3988 0.1344
G-52 $/Therm 0.3988 0.1194
G-53 $/Therm 0.3988 0.1042
1On October 7, 2020, the Department approved a Settlement Agreement authorizing the sale of Bay State Gas to Eversource Energy.  Eversource Energy/Bay State Gas Company Merger, D.P.U. 20‑59 (October 7, 2020).  The sale closed on October 9, 2020.  The name for Bay State Gas/Columbia Gas of Massachusetts is now Eversource Gas Company of Massachusetts.

 

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.6078 0.2778
G-41/G-51 $/Therm 0.6078 0.1272
G-42/G-52 $/Therm 0.6078 0.1016
G-43/G-53 $/Therm 0.6078 0.0809
T-54 $/Therm 0.6078 0.0235

Fitchburg Gas d/b/a Unitil

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4807 0.4468
Residential Heating R-3, R-4 $/Therm 0.5293 0.4468
G-41 $/Therm 0.5293 0.3239
G-42 $/Therm 0.5293 0.2109
G-43 $/Therm 0.5293 0.1701
G-51 $/Therm 0.4807 0.3239
G-52 $/Therm 0.4807 0.2109
G-53 $/Therm 0.4807 0.1701

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)2 REVISED

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4023 0.3337
Residential Heating R-3, R-4 $/Therm 0.4023 0.3258
G-41, G-42, G-43 $/Therm 0.4023 0.1590
G-51, G-52, G-53 $/Therm 0.4023 0.1191
2On October 13, 2020, the Department approved the acquisition of Blackstone Gas Company by Liberty Utilities.  Petition of Liberty Utilities for approval by the Department of Public Utilities, pursuant to G.L. c. 164, § 96, of the acquisition of Blackstone Gas Company, D.P.U. 20-03, at n.5 (October 13, 2020).  The acquisition closed on December 31, 2020.  The name for Blackstone Gas Company is now Liberty Utilities.

 

Liberty Utilities - North Attleboro/Fall River

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.4547 0.3824
G-41, G-42, G-43 $/Therm 0.4547 0.2576
G-51, G-52, G-53 $/Therm 0.4547 0.1930

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5867 0.2991
G-41B/E, G-51B/E $/Therm 0.5867 0.1536
G-42B/E, G-52B/E $/Therm 0.5867 0.1500
G-43B/E, G-53B/E $/Therm 0.5867 0.1380
G-44B, G-54B $/Therm 0.2757 0.1277
G-44B, G-54B $/MDCQ 3.7847  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5826 0.2702
G-41, G-51 $/Therm 0.5826 0.1229
G-42, G-52 $/Therm 0.5826 0.1107
G-43, G-53 $/Therm 0.5826 0.1007

NSTAR Gas Company d/b/a Eversource Energy

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.6946 0.3371
G-41, G-51 $/Therm 0.6946 0.1565
G-42, G-52 $/Therm 0.6946 0.1375
G-43, G-53, T-1 $/Therm 0.6946 0.1056

 

Peak Period 2020-2021 Rates Revision 2 (Effective 1/1/21 through 1/31/21)

Eversource Gas Company of Massachusetts (formerly Bay State Gas d/b/a Columbia Gas of Massachusetts)1

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4855 0.3265
Residential Heating R-3, R-4 $/Therm 0.6016 0.3265
G-40 $/Therm 0.6016 0.1939
G-41 $/Therm 0.6016 0.1344
G-42 $/Therm 0.6016 0.1194
G-43 $/Therm 0.6016 0.1042
G-50 $/Therm 0.4855 0.1939
G-51 $/Therm 0.4855 0.1344
G-52 $/Therm 0.4855 0.1194
G-53 $/Therm 0.4855 0.1042
1On October 7, 2020, the Department approved a Settlement Agreement authorizing the sale of Bay State Gas to Eversource Energy.  Eversource Energy/Bay State Gas Company Merger, D.P.U. 20‑59 (October 7, 2020).  The sale closed on October 9, 2020.  The name for Bay State Gas/Columbia Gas of Massachusetts is now Eversource Gas Company of Massachusetts.

 

Berkshire Gas CompanyREVISED

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.6078 0.2778
G-41/G-51 $/Therm 0.6078 0.1272
G-42/G-52 $/Therm 0.6078 0.1016
G-43/G-53 $/Therm 0.6078 0.0809
T-54 $/Therm 0.6078 0.0235

 

Fitchburg Gas d/b/a Unitil

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4807 0.4468
Residential Heating R-3, R-4 $/Therm 0.5293 0.4468
G-41 $/Therm 0.5293 0.3239
G-42 $/Therm 0.5293 0.2109
G-43 $/Therm 0.5293 0.1701
G-51 $/Therm 0.4807 0.3239
G-52 $/Therm 0.4807 0.2109
G-53 $/Therm 0.4807 0.1701

 

 

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)2 REVISED

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4424 0.3337
Residential Heating R-3, R-4 $/Therm 0.4424 0.3258
G-41, G-42, G-43 $/Therm 0.4424 0.1590
G-51, G-52, G-53 $/Therm 0.4424 0.1191
2On October 13, 2020, the Department approved the acquisition of Blackstone Gas Company by Liberty Utilities.  Petition of Liberty Utilities for approval by the Department of Public Utilities, pursuant to G.L. c. 164, § 96, of the acquisition of Blackstone Gas Company, D.P.U. 20-03, at n.5 (October 13, 2020).  The acquisition closed on December 31, 2020.  The name for Blackstone Gas Company is now Liberty Utilities.

 

Liberty Utilities - North Attleboro/Fall RiverREVISED

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.4547 0.3824
G-41, G-42, G-43 $/Therm 0.4547 0.2576
G-51, G-52, G-53 $/Therm 0.4547 0.1930

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5867 0.2991
G-41B/E, G-51B/E $/Therm 0.5867 0.1536
G-42B/E, G-52B/E $/Therm 0.5867 0.1500
G-43B/E, G-53B/E $/Therm 0.5867 0.1380
G-44B, G-54B $/Therm 0.2757 0.1277
G-44B, G-54B $/MDCQ 3.7847  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5826 0.2702
G-41, G-51 $/Therm 0.5826 0.1229
G-42, G-52 $/Therm 0.5826 0.1107
G-43, G-53 $/Therm 0.5826 0.1007

NSTAR Gas Company d/b/a Eversource EnergyREVISED

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.6946 0.3371
G-41, G-51 $/Therm 0.6946 0.1565
G-42, G-52 $/Therm 0.6946 0.1375
G-43, G-53, T-1 $/Therm 0.6946 0.1056

 

Peak Period 2020-2021 Rates Revision 1 (Effective 12/1/20 through 12/31/20

Eversource Gas Company of Massachusetts (formerly Bay State Gas d/b/a Columbia Gas of Massachusetts)1

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4855 0.3265
Residential Heating R-3, R-4 $/Therm 0.6016 0.3265
G-40 $/Therm 0.6016 0.1939
G-41 $/Therm 0.6016 0.1344
G-42 $/Therm 0.6016 0.1194
G-43 $/Therm 0.6016 0.1042
G-50 $/Therm 0.4855 0.1939
G-51 $/Therm 0.4855 0.1344
G-52 $/Therm 0.4855 0.1194
G-53 $/Therm 0.4855 0.1042
1On October 7, 2020, the Department approved a Settlement Agreement authorizing the sale of Bay State Gas to Eversource Energy.  Eversource Energy/Bay State Gas Company Merger, D.P.U. 20‑59 (October 7, 2020).  The sale closed on October 9, 2020.  The name for Bay State Gas/Columbia Gas of Massachusetts is now Eversource Gas Company of Massachusetts.

 

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.6552 0.2778
G-41/G-51 $/Therm 0.6552 0.1272
G-42/G-52 $/Therm 0.6552 0.1016
G-43/G-53 $/Therm 0.6552 0.0809
T-54 $/Therm 0.6552 0.0235

Blackstone Gas Company

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Ccf 0.5126 0.2124
Residential Heating R-3, R-4 $/Ccf 0.5126 0.1953
G-1, School Rate $/Ccf 0.5126 0.0635

Fitchburg Gas d/b/a Unitil

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4807 0.4468
Residential Heating R-3, R-4 $/Therm 0.5293 0.4468
G-41 $/Therm 0.5293 0.3239
G-42 $/Therm 0.5293 0.2109
G-43 $/Therm 0.5293 0.1701
G-51 $/Therm 0.4807 0.3239
G-52 $/Therm 0.4807 0.2109
G-53 $/Therm 0.4807 0.1701

Liberty Utilities

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5601 0.3824
G-41, G-42, G-43 $/Therm 0.5601 0.2576
G-51, G-52, G-53 $/Therm 0.5601 0.1930

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5867 0.2991
G-41B/E, G-51B/E $/Therm 0.5867 0.1536
G-42B/E, G-52B/E $/Therm 0.5867 0.1500
G-43B/E, G-53B/E $/Therm 0.5867 0.1380
G-44B, G-54B $/Therm 0.2757 0.1277
G-44B, G-54B $/MDCQ 3.7847  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5826 0.2702
G-41, G-51 $/Therm 0.5826 0.1229
G-42, G-52 $/Therm 0.5826 0.1107
G-43, G-53 $/Therm 0.5826 0.1007

NSTAR Gas Company d/b/a Eversource EnergyREVISED

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.6946 0.3333
G-41, G-51 $/Therm 0.6946 0.1586
G-42, G-52 $/Therm 0.6946 0.1366
G-43, G-53, T-1 $/Therm 0.6946 0.1046

 

Peak Period 2020-2021 Rates (Effective 11/1/20 through 11/30/20)

Eversource Gas Company of Massachusetts (formerly Bay State Gas d/b/a Columbia Gas of Massachusetts)1

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4855 0.3265
Residential Heating R-3, R-4 $/Therm 0.6016 0.3265
G-40 $/Therm 0.6016 0.1939
G-41 $/Therm 0.6016 0.1344
G-42 $/Therm 0.6016 0.1194
G-43 $/Therm 0.6016 0.1042
G-50 $/Therm 0.4855 0.1939
G-51 $/Therm 0.4855 0.1344
G-52 $/Therm 0.4855 0.1194
G-53 $/Therm 0.4855 0.1042
1On October 7, 2020, the Department approved a Settlement Agreement authorizing the sale of Bay State Gas to Eversource Energy.  Eversource Energy/Bay State Gas Company Merger, D.P.U. 20‑59 (October 7, 2020).  The sale closed on October 9, 2020.  The name for Bay State Gas/Columbia Gas of Massachusetts is now Eversource Gas Company of Massachusetts.

 

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.6552 0.2778
G-41/G-51 $/Therm 0.6552 0.1272
G-42/G-52 $/Therm 0.6552 0.1016
G-43/G-53 $/Therm 0.6552 0.0809
T-54 $/Therm 0.6552 0.0235

Blackstone Gas Company

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Ccf 0.5126 0.2124
Residential Heating R-3, R-4 $/Ccf 0.5126 0.1953
G-1, School Rate $/Ccf 0.5126 0.0635

Fitchburg Gas d/b/a Unitil

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.4807 0.4468
Residential Heating R-3, R-4 $/Therm 0.5293 0.4468
G-41 $/Therm 0.5293 0.3239
G-42 $/Therm 0.5293 0.2109
G-43 $/Therm 0.5293 0.1701
G-51 $/Therm 0.4807 0.3239
G-52 $/Therm 0.4807 0.2109
G-53 $/Therm 0.4807 0.1701

Liberty Utilities

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5601 0.3824
G-41, G-42, G-43 $/Therm 0.5601 0.2576
G-51, G-52, G-53 $/Therm 0.5601 0.1930

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5867 0.2991
G-41B/E, G-51B/E $/Therm 0.5867 0.1536
G-42B/E, G-52B/E $/Therm 0.5867 0.1500
G-43B/E, G-53B/E $/Therm 0.5867 0.1380
G-44B, G-54B $/Therm 0.2757 0.1277
G-44B, G-54B $/MDCQ 3.7847  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.5826 0.2702
G-41, G-51 $/Therm 0.5826 0.1229
G-42, G-52 $/Therm 0.5826 0.1107
G-43, G-53 $/Therm 0.5826 0.1007

NSTAR Gas Company d/b/a Eversource Energy

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.6946 0.3622
G-41, G-51 $/Therm 0.6946 0.1738
G-42, G-52 $/Therm 0.6946 0.1293
G-43, G-53, T-1 $/Therm 0.6946 0.1191

 

Off-Peak 2020 Rates Revision 4 (Effective 10/1/20 through 10/31/20)

Bay State Gas d/b/a Columbia Gas of Massachusetts

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.2270 0.2748
Residential Heating R-3, R-4 $/Therm 0.2675 0.2748
G-40 $/Therm 0.2675 0.1769
G-41 $/Therm 0.2675 0.1280
G-42 $/Therm 0.2675 0.1154
G-43 $/Therm 0.2675 0.1020
G-50 $/Therm 0.2270 0.1769
G-51 $/Therm 0.2270 0.1280
G-52 $/Therm 0.2270 0.1154
G-53 $/Therm 0.2270 0.1020

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.2159 0.2947
G-41/G-51 $/Therm 0.2159 0.1585
G-42/G-52 $/Therm 0.2159 0.1257
G-43/G-53 $/Therm 0.2159 0.0958
T-54 $/Therm 0.2159 0.0275

Blackstone Gas Company

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Ccf 0.4049 0.1619
Residential Heating R-3, R-4 $/Ccf 0.4049 0.1473
G-1, School Rate $/Ccf 0.4049 0.0868

Fitchburg Gas d/b/a Unitil

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.1740 0.3871
Residential Heating R-3, R-4 $/Therm 0.1970 0.3871
G-41 $/Therm 0.1970 0.2731
G-42 $/Therm 0.1970 0.1898
G-43 $/Therm 0.1970 0.1653
G-51 $/Therm 0.1740 0.2731
G-52 $/Therm 0.1740 0.1898
G-53 $/Therm 0.1740 0.1653

Liberty Utilities

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.1523 0.3902
G-41, G-42, G-43 $/Therm 0.1523 0.2103
G-51, G-52, G-53 $/Therm 0.1523 0.1614

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2842 0.2504
G-41B/E, G-51B/E $/Therm 0.2842 0.1578
G-42B/E, G-52B/E $/Therm 0.2842 0.1551
G-43B/E, G-53B/E $/Therm 0.2842 0.1454
G-44B, G-54B $/Therm 0.1492 0.1372
G-44B, G-54B $/MDCQ 1.3958  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2764 0.2190
G-41, G-51 $/Therm 0.2764 0.1266
G-42, G-52 $/Therm 0.2764 0.1162
G-43, G-53 $/Therm 0.2764 0.1069

NSTAR Gas Company d/b/a Eversource EnergyREVISED

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.0109 0.3362
G-41, G-51 $/Therm 0.0109 0.2071
G-42, G-52 $/Therm 0.0109 0.1612
G-43, G-53, T-1 $/Therm 0.0109 0.1502

 

Off-Peak 2020 Rates Revision 3 (Effective 9/1/20 through 9/30/20)

Bay State Gas d/b/a Columbia Gas of Massachusetts

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.2270 0.2748
Residential Heating R-3, R-4 $/Therm 0.2675 0.2748
G-40 $/Therm 0.2675 0.1769
G-41 $/Therm 0.2675 0.1280
G-42 $/Therm 0.2675 0.1154
G-43 $/Therm 0.2675 0.1020
G-50 $/Therm 0.2270 0.1769
G-51 $/Therm 0.2270 0.1280
G-52 $/Therm 0.2270 0.1154
G-53 $/Therm 0.2270 0.1020

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.2159 0.2947
G-41/G-51 $/Therm 0.2159 0.1585
G-42/G-52 $/Therm 0.2159 0.1257
G-43/G-53 $/Therm 0.2159 0.0958
T-54 $/Therm 0.2159 0.0275

Blackstone Gas CompanyREVISED

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Ccf 0.4049 0.1619
Residential Heating R-3, R-4 $/Ccf 0.4049 0.1473
G-1, School Rate $/Ccf 0.4049 0.0868

Fitchburg Gas d/b/a Unitil

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.1740 0.3871
Residential Heating R-3, R-4 $/Therm 0.1970 0.3871
G-41 $/Therm 0.1970 0.2731
G-42 $/Therm 0.1970 0.1898
G-43 $/Therm 0.1970 0.1653
G-51 $/Therm 0.1740 0.2731
G-52 $/Therm 0.1740 0.1898
G-53 $/Therm 0.1740 0.1653

Liberty Utilities

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.1523 0.3902
G-41, G-42, G-43 $/Therm 0.1523 0.2103
G-51, G-52, G-53 $/Therm 0.1523 0.1614

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2842 0.2504
G-41B/E, G-51B/E $/Therm 0.2842 0.1578
G-42B/E, G-52B/E $/Therm 0.2842 0.1551
G-43B/E, G-53B/E $/Therm 0.2842 0.1454
G-44B, G-54B $/Therm 0.1492 0.1372
G-44B, G-54B $/MDCQ 1.3958  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2764 0.2190
G-41, G-51 $/Therm 0.2764 0.1266
G-42, G-52 $/Therm 0.2764 0.1162
G-43, G-53 $/Therm 0.2764 0.1069

NSTAR Gas Company d/b/a Eversource Energy

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.1547 0.3362
G-41, G-51 $/Therm 0.1547 0.2071
G-42, G-52 $/Therm 0.1547 0.1612
G-43, G-53, T-1 $/Therm 0.1547 0.1502

 

Off-Peak 2020 Rates Revision 2 (Effective 8/1/20 through 8/31/20)

Bay State Gas d/b/a Columbia Gas of Massachusetts

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.2270 0.2748
Residential Heating R-3, R-4 $/Therm 0.2675 0.2748
G-40 $/Therm 0.2675 0.1769
G-41 $/Therm 0.2675 0.1280
G-42 $/Therm 0.2675 0.1154
G-43 $/Therm 0.2675 0.1020
G-50 $/Therm 0.2270 0.1769
G-51 $/Therm 0.2270 0.1280
G-52 $/Therm 0.2270 0.1154
G-53 $/Therm 0.2270 0.1020

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.2159 0.2947
G-41/G-51 $/Therm 0.2159 0.1585
G-42/G-52 $/Therm 0.2159 0.1257
G-43/G-53 $/Therm 0.2159 0.0958
T-54 $/Therm 0.2159 0.0275

Blackstone Gas Company

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Ccf 0.3418 0.1619
Residential Heating R-3, R-4 $/Ccf 0.3418 0.1473
G-1, School Rate $/Ccf 0.3418 0.0868

Fitchburg Gas d/b/a Unitil

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.1740 0.3871
Residential Heating R-3, R-4 $/Therm 0.1970 0.3871
G-41 $/Therm 0.1970 0.2731
G-42 $/Therm 0.1970 0.1898
G-43 $/Therm 0.1970 0.1653
G-51 $/Therm 0.1740 0.2731
G-52 $/Therm 0.1740 0.1898
G-53 $/Therm 0.1740 0.1653

Liberty Utilities

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.1523 0.3902
G-41, G-42, G-43 $/Therm 0.1523 0.2103
G-51, G-52, G-53 $/Therm 0.1523 0.1614

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2842 0.2504
G-41B/E, G-51B/E $/Therm 0.2842 0.1578
G-42B/E, G-52B/E $/Therm 0.2842 0.1551
G-43B/E, G-53B/E $/Therm 0.2842 0.1454
G-44B, G-54B $/Therm 0.1492 0.1372
G-44B, G-54B $/MDCQ 1.3958  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2764 0.2190
G-41, G-51 $/Therm 0.2764 0.1266
G-42, G-52 $/Therm 0.2764 0.1162
G-43, G-53 $/Therm 0.2764 0.1069

NSTAR Gas Company d/b/a Eversource EnergyREVISED

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.1547 0.3362
G-41, G-51 $/Therm 0.1547 0.2071
G-42, G-52 $/Therm 0.1547 0.1612
G-43, G-53, T-1 $/Therm 0.1547 0.1502

 

Off-Peak 2020 Rates Revision 1 (Effective 7/1/20 through 7/31/20)

Bay State Gas d/b/a Columbia Gas of MassachusettsREVISED

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.2270 0.2748
Residential Heating R-3, R-4 $/Therm 0.2675 0.2748
G-40 $/Therm 0.2675 0.1769
G-41 $/Therm 0.2675 0.1280
G-42 $/Therm 0.2675 0.1154
G-43 $/Therm 0.2675 0.1020
G-50 $/Therm 0.2270 0.1769
G-51 $/Therm 0.2270 0.1280
G-52 $/Therm 0.2270 0.1154
G-53 $/Therm 0.2270 0.1020

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.2159 0.2947
G-41/G-51 $/Therm 0.2159 0.1585
G-42/G-52 $/Therm 0.2159 0.1257
G-43/G-53 $/Therm 0.2159 0.0958
T-54 $/Therm 0.2159 0.0275

Blackstone Gas CompanyREVISED

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Ccf 0.3418 0.1619
Residential Heating R-3, R-4 $/Ccf 0.3418 0.1473
G-1, School Rate $/Ccf 0.3418 0.0868

Fitchburg Gas d/b/a UnitilREVISED

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.1740 0.3871
Residential Heating R-3, R-4 $/Therm 0.1970 0.3871
G-41 $/Therm 0.1970 0.2731
G-42 $/Therm 0.1970 0.1898
G-43 $/Therm 0.1970 0.1653
G-51 $/Therm 0.1740 0.2731
G-52 $/Therm 0.1740 0.1898
G-53 $/Therm 0.1740 0.1653

Liberty Utilities

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.1523 0.3902
G-41, G-42, G-43 $/Therm 0.1523 0.2103
G-51, G-52, G-53 $/Therm 0.1523 0.1614

National Grid - Boston GasREVISED

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2842 0.2504
G-41B/E, G-51B/E $/Therm 0.2842 0.1578
G-42B/E, G-52B/E $/Therm 0.2842 0.1551
G-43B/E, G-53B/E $/Therm 0.2842 0.1454
G-44B, G-54B $/Therm 0.1492 0.1372
G-44B, G-54B $/MDCQ 1.3958  

National Grid - Colonial GasREVISED

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2764 0.2190
G-41, G-51 $/Therm 0.2764 0.1266
G-42, G-52 $/Therm 0.2764 0.1162
G-43, G-53 $/Therm 0.2764 0.1069

NSTAR Gas Company d/b/a Eversource EnergyREVISED

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.1881 0.3362
G-41, G-51 $/Therm 0.1881 0.2071
G-42, G-52 $/Therm 0.1881 0.1612
G-43, G-53, T-1 $/Therm 0.1881 0.1502

 

Off-Peak 2020 Rates (Effective 5/1/20 through 6/30/20)

Bay State Gas d/b/a Columbia Gas of Massachusetts

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.2805 0.2748
Residential Heating R-3, R-4 $/Therm 0.3210 0.2748
G-40 $/Therm 0.3210 0.1769
G-41 $/Therm 0.3210 0.1280
G-42 $/Therm 0.3210 0.1154
G-43 $/Therm 0.3210 0.1020
G-50 $/Therm 0.2805 0.1769
G-51 $/Therm 0.2805 0.1280
G-52 $/Therm 0.2805 0.1154
G-53 $/Therm 0.2805 0.1020

Berkshire Gas Company

Rate Class Billing Unit GAF LDAF
All Residential  $/Therm 0.2159 0.2947
G-41/G-51 $/Therm 0.2159 0.1585
G-42/G-52 $/Therm 0.2159 0.1257
G-43/G-53 $/Therm 0.2159 0.0958
T-54 $/Therm 0.2159 0.0275

Blackstone Gas Company

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Ccf 0.3166 0.1619
Residential Heating R-3, R-4 $/Ccf 0.3166 0.1473
G-1, School Rate $/Ccf 0.3166 0.0868

Fitchburg Gas d/b/a Unitil

Rate Class Billing Unit GAF LDAF
Residential Non-Heating R-1, R-2 $/Therm 0.2772 0.3871
Residential Heating R-3, R-4 $/Therm 0.3002 0.3871
G-41 $/Therm 0.3002 0.2731
G-42 $/Therm 0.3002 0.1898
G-43 $/Therm 0.3002 0.1653
G-51 $/Therm 0.2772 0.2731
G-52 $/Therm 0.2772 0.1898
G-53 $/Therm 0.2772 0.1653

Liberty Utilities

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.1523 0.3902
G-41, G-42, G-43 $/Therm 0.1523 0.2103
G-51, G-52, G-53 $/Therm 0.1523 0.1614

National Grid - Boston Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.3510 0.2504
G-41B/E, G-51B/E $/Therm 0.3510 0.1578
G-42B/E, G-52B/E $/Therm 0.3510 0.1551
G-43B/E, G-53B/E $/Therm 0.3510 0.1454
G-44B, G-54B $/Therm 0.2008 0.1372
G-44B, G-54B $/MDCQ 1.5532  

National Grid - Colonial Gas

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.3432 0.2190
G-41, G-51 $/Therm 0.3432 0.1266
G-42, G-52 $/Therm 0.3432 0.1162
G-43, G-53 $/Therm 0.3432 0.1069

NSTAR Gas Company d/b/a Eversource Energy

Rate Class Billing Unit GAF LDAF
All Residential $/Therm 0.2246 0.3362
G-41, G-51 $/Therm 0.2246 0.2071
G-42, G-52 $/Therm 0.2246 0.1612
G-43, G-53, T-1 $/Therm 0.2246 0.1502

 

Contact

Phone

Open M-F 9am- 5pm

Online

For questions related to your gas bill, visit the DPU Consumer Division page 
For non-billing gas inquiries Non-BillingGas.Inquiries@mass.gov

Address

Department of Public Utilities
One South Station
5th Floor
Boston, MA 02110
Last updated: May 3, 2021
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