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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.

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Gas Supply Rate/GAF Information

The cost of gas adjustment factor, or GAF, is the rate charged (per therm) by gas companies to recover the cost to buy and transport gas supply to Massachusetts. If you don't know which gas company serves your location, visit here.

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

While the approved GAFs are meant to cover an entire 6-month period, they may be revised during that time due to the change in the market price for natural gas or other factors. 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:

energy efficiency,
environmental response,
Attorney General consultants,
residential assistance, and
gas system enhancement replacement program.

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 File room, click on the applicable Company listed below.

For GAF and LDAF rates in effect before the 2024/25 peak period, please download the Historical GAF/LDAF rates and data Workbook.

Peak/Winter 2024-2025 Rates Revision 1 (Effective 1/1/25 through 4/30/25)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.9044	0.2975
G-41/G-51	$/Therm	0.9044	0.1456
G-42/G-52	$/Therm	0.9044	0.1377
G-43/G-53	$/Therm	0.9044	0.1215
T-54	$/Therm	0.9044	0.0103

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

Rate Class	Billing Unit	GAF	LDAF	Revised LDAF¹
Residential Non-Heating R-1, R-2	$/Therm	0.5965	0.6135	0.6100
Residential Heating R-3, R-4	$/Therm	0.7920	0.6135	0.6100
G-40	$/Therm	0.7920	0.2821	0.2822
G-41	$/Therm	0.7920	0.1927	0.1982
G-42	$/Therm	0.7920	0.2357	0.2378
G-43	$/Therm	0.7920	0.1959	0.2008
G-50	$/Therm	0.5965	0.2821	0.2822
G-51	$/Therm	0.5965	0.1927	0.1982
G-52	$/Therm	0.5965	0.2357	0.2378
G-53	$/Therm	0.5965	0.1959	0.2008

1_{Eversource Gas Company submitted a corrected LDAF for all rate classes, effective December 1, 2024.}

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.3727	0.9242
Residential Heating R-3, R-4	$/Therm	0.6916	0.9242
G-41	$/Therm	0.6916	0.6010
G-42	$/Therm	0.6916	0.4276
G-43	$/Therm	0.6916	0.3816
G-51	$/Therm	0.3727	0.6010
G-52	$/Therm	0.3727	0.4276
G-53	$/Therm	0.3727	0.3816

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.5390	0.4851
G-41, G-42, G-43	$/Therm	0.5390	0.2769
G-51, G-52, G-53	$/Therm	0.5390	0.2491

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.6273	0.8230
G-41, G-42, G-43	$/Therm	0.6273	0.4969
G-51, G-52, G-53	$/Therm	0.6273	0.4235

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8467	0.6680
G-41B/E, G-51B/E	$/Therm	0.8467	0.3070
G-42B/E, G-52B/E	$/Therm	0.8467	0.2860
G-43B/E, G-53B/E	$/Therm	0.8467	0.2709
G-44B, G-54B	$/Therm	0.3416	0.2395
G-44B, G-54B	$/MDCQ Therms	8.3768

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8467	0.5714
G-41, G-51	$/Therm	0.8467	0.2037
G-42, G-52	$/Therm	0.8467	0.1991
G-43, G-53	$/Therm	0.8467	0.1659

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	Revised LDAF¹
All Residential	$/Therm	0.7639	0.8768
G-41, G-51	$/Therm	0.7639	0.3168
G-42, G-52	$/Therm	0.7639	0.2874
G-43, G-53, T-1	$/Therm	0.7639	0.2070

1_{The LDAF for all rate classes increased on January 1, 2025, which was approved by the Department in}_{NSTAR Gas Company, D.P.U. 24-183}_{(December 24, 2024).}

Peak/Winter 2024-2025 Rates (Effective 11/1/24 through 12/31/24)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.9044	0.2975
G-41/G-51	$/Therm	0.9044	0.1456
G-42/G-52	$/Therm	0.9044	0.1377
G-43/G-53	$/Therm	0.9044	0.1215
T-54	$/Therm	0.9044	0.0103

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

Rate Class	Billing Unit	GAF	LDAF	Revised LDAF¹
Residential Non-Heating R-1, R-2	$/Therm	0.5965	0.6135	0.6100
Residential Heating R-3, R-4	$/Therm	0.7920	0.6135	0.6100
G-40	$/Therm	0.7920	0.2821	0.2822
G-41	$/Therm	0.7920	0.1927	0.1982
G-42	$/Therm	0.7920	0.2357	0.2378
G-43	$/Therm	0.7920	0.1959	0.2008
G-50	$/Therm	0.5965	0.2821	0.2822
G-51	$/Therm	0.5965	0.1927	0.1982
G-52	$/Therm	0.5965	0.2357	0.2378
G-53	$/Therm	0.5965	0.1959	0.2008

1_{Eversource Gas Company submitted a corrected LDAF for all rate classes, effective December 1, 2024.}

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.3727	0.9242
Residential Heating R-3, R-4	$/Therm	0.6916	0.9242
G-41	$/Therm	0.6916	0.6010
G-42	$/Therm	0.6916	0.4276
G-43	$/Therm	0.6916	0.3816
G-51	$/Therm	0.3727	0.6010
G-52	$/Therm	0.3727	0.4276
G-53	$/Therm	0.3727	0.3816

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.5390	0.4851
G-41, G-42, G-43	$/Therm	0.5390	0.2769
G-51, G-52, G-53	$/Therm	0.5390	0.2491

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.6273	0.8230
G-41, G-42, G-43	$/Therm	0.6273	0.4969
G-51, G-52, G-53	$/Therm	0.6273	0.4235

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8467	0.6680
G-41B/E, G-51B/E	$/Therm	0.8467	0.3070
G-42B/E, G-52B/E	$/Therm	0.8467	0.2860
G-43B/E, G-53B/E	$/Therm	0.8467	0.2709
G-44B, G-54B	$/Therm	0.3416	0.2395
G-44B, G-54B	$/MDCQ Therms	8.3768

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8467	0.5714
G-41, G-51	$/Therm	0.8467	0.2037
G-42, G-52	$/Therm	0.8467	0.1991
G-43, G-53	$/Therm	0.8467	0.1659

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF	Revised LDAF¹
All Residential	$/Therm	0.7639	0.8805	0.8755
G-41, G-51	$/Therm	0.7639	0.3157	0.3162
G-42, G-52	$/Therm	0.7639	0.2834	0.2872
G-43, G-53, T-1	$/Therm	0.7639	0.2008	0.2066

1_{NSTAR Gas Company submitted a corrected LDAF for all rate classes, effective December 1, 2024.}

Off-Peak/Summer 2024 Rates Revision 4 (Effective 10/1/24 through 10/31/24)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2147	0.2831
G-41/G-51	$/Therm	0.2147	0.0983
G-42/G-52	$/Therm	0.2147	0.0889
G-43/G-53	$/Therm	0.2147	0.8370
T-54	$/Therm	0.2147	0.0269

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2073	0.4727
Residential Heating R-3, R-4	$/Therm	0.2431	0.4727
G-40	$/Therm	0.2431	0.3073
G-41	$/Therm	0.2431	0.2153
G-42	$/Therm	0.2431	0.2366
G-43	$/Therm	0.2431	0.2072
G-50	$/Therm	0.2073	0.3073
G-51	$/Therm	0.2073	0.2153
G-52	$/Therm	0.2073	0.2366
G-53	$/Therm	0.2073	0.2072

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2420	0.8127
Residential Heating R-3, R-4	$/Therm	0.2648	0.8127
G-41	$/Therm	0.2648	0.5491
G-42	$/Therm	0.2648	0.3695
G-43	$/Therm	0.2648	0.3198
G-51	$/Therm	0.2420	0.5491
G-52	$/Therm	0.2420	0.3695
G-53	$/Therm	0.2420	0.3198

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0844	0.5380
G-41, G-42, G-43	$/Therm	0.0844	0.1954
G-51, G-52, G-53	$/Therm	0.0844	0.2059

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0728	0.8759
G-41, G-42, G-43	$/Therm	0.0728	0.4154
G-51, G-52, G-53	$/Therm	0.0728	0.3803

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3566	0.4861
G-41B/E, G-51B/E	$/Therm	0.3566	0.2789
G-42B/E, G-52B/E	$/Therm	0.3566	0.2582
G-43B/E, G-53B/E	$/Therm	0.3566	0.2442
G-44B, G-54B	$/Therm	0.2208	0.2148
G-44B, G-54B	$/MDCQ Therms	1.3216

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3566	0.3896
G-41, G-51	$/Therm	0.3566	0.1760
G-42, G-52	$/Therm	0.3566	0.1715
G-43, G-53	$/Therm	0.3566	0.1400

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2524	0.5728
G-41, G-51	$/Therm	0.2524	0.3130
G-42, G-52	$/Therm	0.2524	0.2884
G-43, G-53, T-1	$/Therm	0.2524	0.2090

Off-Peak/Summer 2024 Rates Revision 3 (Effective 9/1/24 through 9/30/24)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0881	0.2831
G-41/G-51	$/Therm	0.0881	0.0983
G-42/G-52	$/Therm	0.0881	0.0889
G-43/G-53	$/Therm	0.0881	0.8370
T-54	$/Therm	0.0881	0.0269

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2073	0.4727
Residential Heating R-3, R-4	$/Therm	0.2431	0.4727
G-40	$/Therm	0.2431	0.3073
G-41	$/Therm	0.2431	0.2153
G-42	$/Therm	0.2431	0.2366
G-43	$/Therm	0.2431	0.2072
G-50	$/Therm	0.2073	0.3073
G-51	$/Therm	0.2073	0.2153
G-52	$/Therm	0.2073	0.2366
G-53	$/Therm	0.2073	0.2072

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2420	0.8127
Residential Heating R-3, R-4	$/Therm	0.2648	0.8127
G-41	$/Therm	0.2648	0.5491
G-42	$/Therm	0.2648	0.3695
G-43	$/Therm	0.2648	0.3198
G-51	$/Therm	0.2420	0.5491
G-52	$/Therm	0.2420	0.3695
G-53	$/Therm	0.2420	0.3198

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0844	0.5380
G-41, G-42, G-43	$/Therm	0.0844	0.1954
G-51, G-52, G-53	$/Therm	0.0844	0.2059

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0728	0.8759
G-41, G-42, G-43	$/Therm	0.0728	0.4154
G-51, G-52, G-53	$/Therm	0.0728	0.3803

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3566	0.4861
G-41B/E, G-51B/E	$/Therm	0.3566	0.2789
G-42B/E, G-52B/E	$/Therm	0.3566	0.2582
G-43B/E, G-53B/E	$/Therm	0.3566	0.2442
G-44B, G-54B	$/Therm	0.2208	0.2148
G-44B, G-54B	$/MDCQ Therms	1.3216

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3566	0.3896
G-41, G-51	$/Therm	0.3566	0.1760
G-42, G-52	$/Therm	0.3566	0.1715
G-43, G-53	$/Therm	0.3566	0.1400

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2524	0.5728
G-41, G-51	$/Therm	0.2524	0.3130
G-42, G-52	$/Therm	0.2524	0.2884
G-43, G-53, T-1	$/Therm	0.2524	0.2090

Off-Peak/Summer 2024 Rates Revision 2 (Effective 8/1/24 through 8/31/24)

Berkshire Gas Company^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0881	0.2831
G-41/G-51	$/Therm	0.0881	0.0983
G-42/G-52	$/Therm	0.0881	0.0889
G-43/G-53	$/Therm	0.0881	0.0837
T-54	$/Therm	0.0881	0.0269

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2073	0.4727
Residential Heating R-3, R-4	$/Therm	0.2431	0.4727
G-40	$/Therm	0.2431	0.3073
G-41	$/Therm	0.2431	0.2153
G-42	$/Therm	0.2431	0.2366
G-43	$/Therm	0.2431	0.2072
G-50	$/Therm	0.2073	0.3073
G-51	$/Therm	0.2073	0.2153
G-52	$/Therm	0.2073	0.2366
G-53	$/Therm	0.2073	0.2072

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2420	0.8127
Residential Heating R-3, R-4	$/Therm	0.2648	0.8127
G-41	$/Therm	0.2648	0.5491
G-42	$/Therm	0.2648	0.3695
G-43	$/Therm	0.2648	0.3198
G-51	$/Therm	0.2420	0.5491
G-52	$/Therm	0.2420	0.3695
G-53	$/Therm	0.2420	0.3198

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4210	0.5380
G-41, G-42, G-43	$/Therm	0.4210	0.1954
G-51, G-52, G-53	$/Therm	0.4210	0.2059

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0728	0.8759
G-41, G-42, G-43	$/Therm	0.0728	0.4154
G-51, G-52, G-53	$/Therm	0.0728	0.3803

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3566	0.4861
G-41B/E, G-51B/E	$/Therm	0.3566	0.2789
G-42B/E, G-52B/E	$/Therm	0.3566	0.2582
G-43B/E, G-53B/E	$/Therm	0.3566	0.2442
G-44B, G-54B	$/Therm	0.2208	0.2148
G-44B, G-54B	$/MDCQ Therms	1.3216

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3566	0.3896
G-41, G-51	$/Therm	0.3566	0.1760
G-42, G-52	$/Therm	0.3566	0.1715
G-43, G-53	$/Therm	0.3566	0.1400

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2524	0.5728
G-41, G-51	$/Therm	0.2524	0.3130
G-42, G-52	$/Therm	0.2524	0.2884
G-43, G-53, T-1	$/Therm	0.2524	0.2090

Off-Peak/Summer 2024 Rates Revision 1 (Effective 7/1/24 through 7/31/24)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0339	0.4052
G-41/G-51	$/Therm	0.0339	0.1763
G-42/G-52	$/Therm	0.0339	0.1442
G-43/G-53	$/Therm	0.0339	0.1078
T-54	$/Therm	0.0339	0.0269

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2459	0.4727
Residential Heating R-3, R-4	$/Therm	0.2817	0.4727
G-40	$/Therm	0.2817	0.3073
G-41	$/Therm	0.2817	0.2153
G-42	$/Therm	0.2817	0.2366
G-43	$/Therm	0.2817	0.2072
G-50	$/Therm	0.2459	0.3073
G-51	$/Therm	0.2459	0.2153
G-52	$/Therm	0.2459	0.2366
G-53	$/Therm	0.2459	0.2072

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2420	0.8127
Residential Heating R-3, R-4	$/Therm	0.2648	0.8127
G-41	$/Therm	0.2648	0.5491
G-42	$/Therm	0.2648	0.3695
G-43	$/Therm	0.2648	0.3198
G-51	$/Therm	0.2420	0.5491
G-52	$/Therm	0.2420	0.3695
G-53	$/Therm	0.2420	0.3198

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4210	0.5380
G-41, G-42, G-43	$/Therm	0.4210	0.1954
G-51, G-52, G-53	$/Therm	0.4210	0.2059

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0728	0.8759
G-41, G-42, G-43	$/Therm	0.0728	0.4154
G-51, G-52, G-53	$/Therm	0.0728	0.3803

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3816	0.4861
G-41B/E, G-51B/E	$/Therm	0.3816	0.2789
G-42B/E, G-52B/E	$/Therm	0.3816	0.2582
G-43B/E, G-53B/E	$/Therm	0.3816	0.2442
G-44B, G-54B	$/Therm	0.2448	0.2148
G-44B, G-54B	$/MDCQ Therms	1.3306

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3816	0.3896
G-41, G-51	$/Therm	0.3816	0.1760
G-42, G-52	$/Therm	0.3816	0.1715
G-43, G-53	$/Therm	0.3816	0.1400

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2824	0.5728
G-41, G-51	$/Therm	0.2824	0.3130
G-42, G-52	$/Therm	0.2824	0.2884
G-43, G-53, T-1	$/Therm	0.2824	0.2090

Off-Peak/Summer 2024 Rates (Effective 5/1/24 through 6/30/24)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2922	0.4052
G-41/G-51	$/Therm	0.2922	0.1763
G-42/G-52	$/Therm	0.2922	0.1442
G-43/G-53	$/Therm	0.2922	0.1078
T-54	$/Therm	0.2922	0.0269

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2459	0.4727
Residential Heating R-3, R-4	$/Therm	0.2817	0.4727
G-40	$/Therm	0.2817	0.3073
G-41	$/Therm	0.2817	0.2153
G-42	$/Therm	0.2817	0.2366
G-43	$/Therm	0.2817	0.2072
G-50	$/Therm	0.2459	0.3073
G-51	$/Therm	0.2459	0.2153
G-52	$/Therm	0.2459	0.2366
G-53	$/Therm	0.2459	0.2072

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2994	0.8923
Residential Heating R-3, R-4	$/Therm	0.3222	0.8923
G-41	$/Therm	0.3222	0.6742
G-42	$/Therm	0.3222	0.4215
G-43	$/Therm	0.3222	0.3576
G-51	$/Therm	0.2994	0.6742
G-52	$/Therm	0.2994	0.4215
G-53	$/Therm	0.2994	0.3576

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4210	0.5380
G-41, G-42, G-43	$/Therm	0.4210	0.1954
G-51, G-52, G-53	$/Therm	0.4210	0.2059

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2612	0.8759
G-41, G-42, G-43	$/Therm	0.2612	0.4154
G-51, G-52, G-53	$/Therm	0.2612	0.3803

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3816	0.4861
G-41B/E, G-51B/E	$/Therm	0.3816	0.2789
G-42B/E, G-52B/E	$/Therm	0.3816	0.2582
G-43B/E, G-53B/E	$/Therm	0.3816	0.2442
G-44B, G-54B	$/Therm	0.2448	0.2148
G-44B, G-54B	$/MDCQ Therms	1.3306

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3816	0.3896
G-41, G-51	$/Therm	0.3816	0.1760
G-42, G-52	$/Therm	0.3816	0.1715
G-43, G-53	$/Therm	0.3816	0.1400

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2824	0.5728
G-41, G-51	$/Therm	0.2824	0.3130
G-42, G-52	$/Therm	0.2824	0.2884
G-43, G-53, T-1	$/Therm	0.2824	0.2090

Peak/Winter 2023-2024 Rates Revision 3 (Effective 4/1/24 through 4/30/24)

Berkshire Gas Company^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8606	0.3595
G-41/G-51	$/Therm	0.8606	0.1611
G-42/G-52	$/Therm	0.8606	0.1098
G-43/G-53	$/Therm	0.8606	0.0871
T-54	$/Therm	0.8606	0.0182

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.5051	0.4339
Residential Heating R-3, R-4	$/Therm	0.6320	0.4339
G-40	$/Therm	0.6320	0.2838
G-41	$/Therm	0.6320	0.2019
G-42	$/Therm	0.6320	0.2032
G-43	$/Therm	0.6320	0.1808
G-50	$/Therm	0.5051	0.2838
G-51	$/Therm	0.5051	0.2019
G-52	$/Therm	0.5051	0.2032
G-53	$/Therm	0.5051	0.1808

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.5889	0.8090
Residential Heating R-3, R-4	$/Therm	0.6276	0.8090
G-41	$/Therm	0.6276	0.5903
G-42	$/Therm	0.6276	0.3870
G-43	$/Therm	0.6276	0.3274
G-51	$/Therm	0.5889	0.5903
G-52	$/Therm	0.5889	0.3870
G-53	$/Therm	0.5889	0.3274

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2125	0.1671
G-41, G-42, G-43	$/Therm	0.2125	0.0859
G-51, G-52, G-53	$/Therm	0.2125	0.0950

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3737	0.4574
G-41, G-42, G-43	$/Therm	0.3737	0.2743
G-51, G-52, G-53	$/Therm	0.3737	0.2307

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8122	0.4420
G-41B/E, G-51B/E	$/Therm	0.8122	0.2310
G-42B/E, G-52B/E	$/Therm	0.8122	0.2162
G-43B/E, G-53B/E	$/Therm	0.8122	0.2073
G-44B, G-54B	$/Therm	0.4452	0.1865
G-44B, G-54B	$/MDCQ Therms	5.7297

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8122	0.3751
G-41, G-51	$/Therm	0.8122	0.1631
G-42, G-52	$/Therm	0.8122	0.1582
G-43, G-53	$/Therm	0.8122	0.1357

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.6712	0.5033
G-41, G-51	$/Therm	0.6712	0.2668
G-42, G-52	$/Therm	0.6712	0.2465
G-43, G-53, T-1	$/Therm	0.6712	0.1803

Peak/Winter 2023-2024 Rates Revision 2 (Effective 2/1/24 through 3/31/24)

Berkshire Gas Company^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.6648	0.3595
G-41/G-51	$/Therm	0.6648	0.1611
G-42/G-52	$/Therm	0.6648	0.1098
G-43/G-53	$/Therm	0.6648	0.0871
T-54	$/Therm	0.6648	0.0182

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.5051	0.4339
Residential Heating R-3, R-4	$/Therm	0.6320	0.4339
G-40	$/Therm	0.6320	0.2838
G-41	$/Therm	0.6320	0.2019
G-42	$/Therm	0.6320	0.2032
G-43	$/Therm	0.6320	0.1808
G-50	$/Therm	0.5051	0.2838
G-51	$/Therm	0.5051	0.2019
G-52	$/Therm	0.5051	0.2032
G-53	$/Therm	0.5051	0.1808

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF	Revised LDAF¹
Residential Non-Heating R-1, R-2	$/Therm	0.5889	0.7994	0.8090
Residential Heating R-3, R-4	$/Therm	0.6276	0.7994	0.8090
G-41	$/Therm	0.6276	0.5813	0.5903
G-42	$/Therm	0.6276	0.3836	0.3870
G-43	$/Therm	0.6276	0.3245	0.3274
G-51	$/Therm	0.5889	0.5813	0.5903
G-52	$/Therm	0.5889	0.3836	0.3870
G-53	$/Therm	0.5889	0.3245	0.3274

1_{The LDAF for all rate classes increased on March 1, 2024, which was approved by the Department in}_{Fitchburg Gas and Electric Light Company, D.P.U. 23-156}_{(February 28, 2024).}

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2125	0.1671
G-41, G-42, G-43	$/Therm	0.2125	0.0859
G-51, G-52, G-53	$/Therm	0.2125	0.0950

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3737	0.4574
G-41, G-42, G-43	$/Therm	0.3737	0.2743
G-51, G-52, G-53	$/Therm	0.3737	0.2307

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8122	0.4746
G-41B/E, G-51B/E	$/Therm	0.8122	0.2548
G-42B/E, G-52B/E	$/Therm	0.8122	0.2373
G-43B/E, G-53B/E	$/Therm	0.8122	0.2246
G-44B, G-54B	$/Therm	0.4452	0.2008
G-44B, G-54B	$/MDCQ Therms	5.7297

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8122	0.4077
G-41, G-51	$/Therm	0.8122	0.1869
G-42, G-52	$/Therm	0.8122	0.1793
G-43, G-53	$/Therm	0.8122	0.1530

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.6712	0.5033
G-41, G-51	$/Therm	0.6712	0.2668
G-42, G-52	$/Therm	0.6712	0.2465
G-43, G-53, T-1	$/Therm	0.6712	0.1803

Peak/Winter 2023-2024 Rates Revision 1 (Effective 1/1/24 through 4/30/24)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.7748	0.3595
G-41/G-51	$/Therm	0.7748	0.1611
G-42/G-52	$/Therm	0.7748	0.1098
G-43/G-53	$/Therm	0.7748	0.0871
T-54	$/Therm	0.7748	0.0182

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.5051	0.4339
Residential Heating R-3, R-4	$/Therm	0.6320	0.4339
G-40	$/Therm	0.6320	0.2838
G-41	$/Therm	0.6320	0.2019
G-42	$/Therm	0.6320	0.2032
G-43	$/Therm	0.6320	0.1808
G-50	$/Therm	0.5051	0.2838
G-51	$/Therm	0.5051	0.2019
G-52	$/Therm	0.5051	0.2032
G-53	$/Therm	0.5051	0.1808

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.5889	0.7994
Residential Heating R-3, R-4	$/Therm	0.6276	0.7994
G-41	$/Therm	0.6276	0.5813
G-42	$/Therm	0.6276	0.3836
G-43	$/Therm	0.6276	0.3245
G-51	$/Therm	0.5889	0.5813
G-52	$/Therm	0.5889	0.3836
G-53	$/Therm	0.5889	0.3245

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

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2125	0.1671
G-41, G-42, G-43	$/Therm	0.2125	0.0859
G-51, G-52, G-53	$/Therm	0.2125	0.0950

Liberty Utilities - North Attleboro/Fall River^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3737	0.4574
G-41, G-42, G-43	$/Therm	0.3737	0.2743
G-51, G-52, G-53	$/Therm	0.3737	0.2307

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8122	0.4746
G-41B/E, G-51B/E	$/Therm	0.8122	0.2548
G-42B/E, G-52B/E	$/Therm	0.8122	0.2373
G-43B/E, G-53B/E	$/Therm	0.8122	0.2246
G-44B, G-54B	$/Therm	0.4452	0.2008
G-44B, G-54B	$/MDCQ Therms	5.7297

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8122	0.4077
G-41, G-51	$/Therm	0.8122	0.1869
G-42, G-52	$/Therm	0.8122	0.1793
G-43, G-53	$/Therm	0.8122	0.1530

NSTAR Gas Company d/b/a Eversource Energy^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.6712	0.5033
G-41, G-51	$/Therm	0.6712	0.2668
G-42, G-52	$/Therm	0.6712	0.2465
G-43, G-53, T-1	$/Therm	0.6712	0.1803

Peak/Winter 2023-2024 Rates (Effective 11/1/23 through 12/31/23)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.7748	0.3595
G-41/G-51	$/Therm	0.7748	0.1611
G-42/G-52	$/Therm	0.7748	0.1098
G-43/G-53	$/Therm	0.7748	0.0871
T-54	$/Therm	0.7748	0.0182

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.5850	0.4339
Residential Heating R-3, R-4	$/Therm	0.7119	0.4339
G-40	$/Therm	0.7119	0.2838
G-41	$/Therm	0.7119	0.2019
G-42	$/Therm	0.7119	0.2032
G-43	$/Therm	0.7119	0.1808
G-50	$/Therm	0.5850	0.2838
G-51	$/Therm	0.5850	0.2019
G-52	$/Therm	0.5850	0.2032
G-53	$/Therm	0.5850	0.1808

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.5889	0.7994
Residential Heating R-3, R-4	$/Therm	0.6276	0.7994
G-41	$/Therm	0.6276	0.5813
G-42	$/Therm	0.6276	0.3836
G-43	$/Therm	0.6276	0.3245
G-51	$/Therm	0.5889	0.5813
G-52	$/Therm	0.5889	0.3836
G-53	$/Therm	0.5889	0.3245

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.6258	0.1671
G-41, G-42, G-43	$/Therm	0.6258	0.0859
G-51, G-52, G-53	$/Therm	0.6258	0.0950

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.5457	0.4574
G-41, G-42, G-43	$/Therm	0.5457	0.2743
G-51, G-52, G-53	$/Therm	0.5457	0.2307

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8122	0.4746
G-41B/E, G-51B/E	$/Therm	0.8122	0.2548
G-42B/E, G-52B/E	$/Therm	0.8122	0.2373
G-43B/E, G-53B/E	$/Therm	0.8122	0.2246
G-44B, G-54B	$/Therm	0.4452	0.2008
G-44B, G-54B	$/MDCQ Therms	5.7297

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8122	0.4077
G-41, G-51	$/Therm	0.8122	0.1869
G-42, G-52	$/Therm	0.8122	0.1793
G-43, G-53	$/Therm	0.8122	0.1530

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.7680	0.5033
G-41, G-51	$/Therm	0.7680	0.2668
G-42, G-52	$/Therm	0.7680	0.2465
G-43, G-53, T-1	$/Therm	0.7680	0.1803

Off-Peak/Summer 2023 Rates Revision 4 (Effective 9/1/23 through 10/31/23)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.1489	0.4419
G-41/G-51	$/Therm	0.1489	0.2242
G-42/G-52	$/Therm	0.1489	0.1417
G-43/G-53	$/Therm	0.1489	0.0860
T-54	$/Therm	0.1489	0.0178

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2303	0.4745
Residential Heating R-3, R-4	$/Therm	0.2535	0.4745
G-40	$/Therm	0.2535	0.2913
G-41	$/Therm	0.2535	0.2123
G-42	$/Therm	0.2535	0.1986
G-43	$/Therm	0.2535	0.1801
G-50	$/Therm	0.2303	0.2913
G-51	$/Therm	0.2303	0.2123
G-52	$/Therm	0.2303	0.1986
G-53	$/Therm	0.2303	0.1801

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.3354	0.7165
Residential Heating R-3, R-4	$/Therm	0.3624	0.7165
G-41	$/Therm	0.3624	0.4943
G-42	$/Therm	0.3624	0.2999
G-43	$/Therm	0.3624	0.2369
G-51	$/Therm	0.3354	0.4943
G-52	$/Therm	0.3354	0.2999
G-53	$/Therm	0.3354	0.2369

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4343	0.3985
G-41, G-42, G-43	$/Therm	0.4343	0.1896
G-51, G-52, G-53	$/Therm	0.4343	0.1209

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0636	0.6888
G-41, G-42, G-43	$/Therm	0.0636	0.3780
G-51, G-52, G-53	$/Therm	0.0636	0.2566

National Grid - Boston Gas^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.1746	0.4796
G-41B/E, G-51B/E	$/Therm	0.1746	0.2737
G-42B/E, G-52B/E	$/Therm	0.1746	0.2526
G-43B/E, G-53B/E	$/Therm	0.1746	0.2391
G-44B, G-54B	$/Therm	0.0808	0.2111
G-44B, G-54B	$/MDCQ Therms	1.0903

National Grid - former Colonial Gas^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.1746	0.3886
G-41, G-51	$/Therm	0.1746	0.1840
G-42, G-52	$/Therm	0.1746	0.1752
G-43, G-53	$/Therm	0.1746	0.1500

NSTAR Gas Company d/b/a Eversource Energy^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0233	0.5033
G-41, G-51	$/Therm	0.0233	0.2971
G-42, G-52	$/Therm	0.0233	0.2720
G-43, G-53, T-1	$/Therm	0.0233	0.2019

Off-Peak/Summer 2023 Rates Revision 3 (Effective 8/1/23 through 8/31/23)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.1489	0.4419
G-41/G-51	$/Therm	0.1489	0.2242
G-42/G-52	$/Therm	0.1489	0.1417
G-43/G-53	$/Therm	0.1489	0.0860
T-54	$/Therm	0.1489	0.0178

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2303	0.4745
Residential Heating R-3, R-4	$/Therm	0.2535	0.4745
G-40	$/Therm	0.2535	0.2913
G-41	$/Therm	0.2535	0.2123
G-42	$/Therm	0.2535	0.1986
G-43	$/Therm	0.2535	0.1801
G-50	$/Therm	0.2303	0.2913
G-51	$/Therm	0.2303	0.2123
G-52	$/Therm	0.2303	0.1986
G-53	$/Therm	0.2303	0.1801

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.3354	0.7165
Residential Heating R-3, R-4	$/Therm	0.3624	0.7165
G-41	$/Therm	0.3624	0.4943
G-42	$/Therm	0.3624	0.2999
G-43	$/Therm	0.3624	0.2369
G-51	$/Therm	0.3354	0.4943
G-52	$/Therm	0.3354	0.2999
G-53	$/Therm	0.3354	0.2369

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4343	0.3985
G-41, G-42, G-43	$/Therm	0.4343	0.1896
G-51, G-52, G-53	$/Therm	0.4343	0.1209

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0636	0.6888
G-41, G-42, G-43	$/Therm	0.0636	0.3780
G-51, G-52, G-53	$/Therm	0.0636	0.2566

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2273	0.4796
G-41B/E, G-51B/E	$/Therm	0.2273	0.2737
G-42B/E, G-52B/E	$/Therm	0.2273	0.2526
G-43B/E, G-53B/E	$/Therm	0.2273	0.2391
G-44B, G-54B	$/Therm	0.1254	0.2111
G-44B, G-54B	$/MDCQ Therms	1.1319

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2273	0.3886
G-41, G-51	$/Therm	0.2273	0.1840
G-42, G-52	$/Therm	0.2273	0.1752
G-43, G-53	$/Therm	0.2273	0.1500

NSTAR Gas Company d/b/a Eversource Energy^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0889	0.5033
G-41, G-51	$/Therm	0.0889	0.2971
G-42, G-52	$/Therm	0.0889	0.2720
G-43, G-53, T-1	$/Therm	0.0889	0.2019

Off-Peak/Summer 2023 Rates Revision 2 (Effective 7/1/23 through 7/31/23)

Berkshire Gas Company^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.1489	0.4419
G-41/G-51	$/Therm	0.1489	0.2242
G-42/G-52	$/Therm	0.1489	0.1417
G-43/G-53	$/Therm	0.1489	0.0860
T-54	$/Therm	0.1489	0.0178

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2303	0.4745
Residential Heating R-3, R-4	$/Therm	0.2535	0.4745
G-40	$/Therm	0.2535	0.2913
G-41	$/Therm	0.2535	0.2123
G-42	$/Therm	0.2535	0.1986
G-43	$/Therm	0.2535	0.1801
G-50	$/Therm	0.2303	0.2913
G-51	$/Therm	0.2303	0.2123
G-52	$/Therm	0.2303	0.1986
G-53	$/Therm	0.2303	0.1801

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.3354	0.7165
Residential Heating R-3, R-4	$/Therm	0.3624	0.7165
G-41	$/Therm	0.3624	0.4943
G-42	$/Therm	0.3624	0.2999
G-43	$/Therm	0.3624	0.2369
G-51	$/Therm	0.3354	0.4943
G-52	$/Therm	0.3354	0.2999
G-53	$/Therm	0.3354	0.2369

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4343	0.3985
G-41, G-42, G-43	$/Therm	0.4343	0.1896
G-51, G-52, G-53	$/Therm	0.4343	0.1209

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0636	0.6888
G-41, G-42, G-43	$/Therm	0.0636	0.3780
G-51, G-52, G-53	$/Therm	0.0636	0.2566

National Grid - Boston Gas^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2273	0.4796
G-41B/E, G-51B/E	$/Therm	0.2273	0.2737
G-42B/E, G-52B/E	$/Therm	0.2273	0.2526
G-43B/E, G-53B/E	$/Therm	0.2273	0.2391
G-44B, G-54B	$/Therm	0.1254	0.2111
G-44B, G-54B	$/MDCQ Therms	1.1319

National Grid - former Colonial Gas^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2273	0.3886
G-41, G-51	$/Therm	0.2273	0.1840
G-42, G-52	$/Therm	0.2273	0.1752
G-43, G-53	$/Therm	0.2273	0.1500

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.1474	0.5033
G-41, G-51	$/Therm	0.1474	0.2971
G-42, G-52	$/Therm	0.1474	0.2720
G-43, G-53, T-1	$/Therm	0.1474	0.2019

Off-Peak/Summer 2023 Rates Revision 1 (Effective 6/1/23 through 6/30/23)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3614	0.4419
G-41/G-51	$/Therm	0.3614	0.2242
G-42/G-52	$/Therm	0.3614	0.1417
G-43/G-53	$/Therm	0.3614	0.0860
T-54	$/Therm	0.3614	0.0178

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2303	0.4745
Residential Heating R-3, R-4	$/Therm	0.2535	0.4745
G-40	$/Therm	0.2535	0.2913
G-41	$/Therm	0.2535	0.2123
G-42	$/Therm	0.2535	0.1986
G-43	$/Therm	0.2535	0.1801
G-50	$/Therm	0.2303	0.2913
G-51	$/Therm	0.2303	0.2123
G-52	$/Therm	0.2303	0.1986
G-53	$/Therm	0.2303	0.1801

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.3354	0.7165
Residential Heating R-3, R-4	$/Therm	0.3624	0.7165
G-41	$/Therm	0.3624	0.4943
G-42	$/Therm	0.3624	0.2999
G-43	$/Therm	0.3624	0.2369
G-51	$/Therm	0.3354	0.4943
G-52	$/Therm	0.3354	0.2999
G-53	$/Therm	0.3354	0.2369

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4343	0.3985
G-41, G-42, G-43	$/Therm	0.4343	0.1896
G-51, G-52, G-53	$/Therm	0.4343	0.1209

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0636	0.6888
G-41, G-42, G-43	$/Therm	0.0636	0.3780
G-51, G-52, G-53	$/Therm	0.0636	0.2566

National Grid - Boston Gas^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2839	0.4796
G-41B/E, G-51B/E	$/Therm	0.2839	0.2737
G-42B/E, G-52B/E	$/Therm	0.2839	0.2526
G-43B/E, G-53B/E	$/Therm	0.2839	0.2391
G-44B, G-54B	$/Therm	0.1759	0.2111
G-44B, G-54B	$/MDCQ Therms	1.1557

National Grid - former Colonial Gas^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2839	0.3886
G-41, G-51	$/Therm	0.2839	0.1840
G-42, G-52	$/Therm	0.2839	0.1752
G-43, G-53	$/Therm	0.2839	0.1500

NSTAR Gas Company d/b/a Eversource Energy^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.1474	0.5033
G-41, G-51	$/Therm	0.1474	0.2971
G-42, G-52	$/Therm	0.1474	0.2720
G-43, G-53, T-1	$/Therm	0.1474	0.2019

Off-Peak/Summer 2023 Rates (Effective 5/1/23 through 5/31/23)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3614	0.4419
G-41/G-51	$/Therm	0.3614	0.2242
G-42/G-52	$/Therm	0.3614	0.1417
G-43/G-53	$/Therm	0.3614	0.0860
T-54	$/Therm	0.3614	0.0178

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

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.2492	0.4760
Residential Heating R-3, R-4	$/Therm	0.2725	0.4760
G-40	$/Therm	0.2725	0.2932
G-41	$/Therm	0.2725	0.2134
G-42	$/Therm	0.2725	0.1995
G-43	$/Therm	0.2725	0.1808
G-50	$/Therm	0.2492	0.2932
G-51	$/Therm	0.2492	0.2134
G-52	$/Therm	0.2492	0.1995
G-53	$/Therm	0.2492	0.1808

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.3354	0.7165
Residential Heating R-3, R-4	$/Therm	0.3624	0.7165
G-41	$/Therm	0.3624	0.4943
G-42	$/Therm	0.3624	0.2999
G-43	$/Therm	0.3624	0.2369
G-51	$/Therm	0.3354	0.4943
G-52	$/Therm	0.3354	0.2999
G-53	$/Therm	0.3354	0.2369

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4343	0.3985
G-41, G-42, G-43	$/Therm	0.4343	0.1896
G-51, G-52, G-53	$/Therm	0.4343	0.1209

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.0636	0.6888
G-41, G-42, G-43	$/Therm	0.0636	0.3780
G-51, G-52, G-53	$/Therm	0.0636	0.2566

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4217	0.4796
G-41B/E, G-51B/E	$/Therm	0.4217	0.2737
G-42B/E, G-52B/E	$/Therm	0.4217	0.2526
G-43B/E, G-53B/E	$/Therm	0.4217	0.2391
G-44B, G-54B	$/Therm	0.2905	0.2111
G-44B, G-54B	$/MDCQ Therms	1.2451

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.4217	0.3886
G-41, G-51	$/Therm	0.4217	0.1840
G-42, G-52	$/Therm	0.4217	0.1752
G-43, G-53	$/Therm	0.4217	0.1500

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.1831	0.5033
G-41, G-51	$/Therm	0.1831	0.2971
G-42, G-52	$/Therm	0.1831	0.2720
G-43, G-53, T-1	$/Therm	0.1831	0.2019

Contact for Cost of Gas Adjustment Factor Rates and Information

Online

For questions related to your gas bill, visit the DPU Consumer Division page

For non-billing gas inquiries Email DPU Gas Division at Non-BillingGas.Inquiries@mass.gov

Phone

Call DPU Gas Division at (617) 305-3545

Open M-F 9am- 5pm

Address

Department of Public Utilities

One South Station, 3rd Floor, Boston, MA 02110

Directions

Last updated:	June 30, 2023

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Cost of Gas Adjustment Factor Rates and Information

Table of Contents

Gas Supply Rate/GAF Information

GAF Rate Schedule

GAF Revisions

LDAF Rate Information

Historical GAF/LDAF rates and data

Peak/Winter 2024-2025 Rates Revision 1 (Effective 1/1/25 through 4/30/25)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Peak/Winter 2024-2025 Rates (Effective 11/1/24 through 12/31/24)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Off-Peak/Summer 2024 Rates Revision 4 (Effective 10/1/24 through 10/31/24)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Off-Peak/Summer 2024 Rates Revision 3 (Effective 9/1/24 through 9/30/24)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Off-Peak/Summer 2024 Rates Revision 2 (Effective 8/1/24 through 8/31/24)

Berkshire Gas CompanyREVISED

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Off-Peak/Summer 2024 Rates Revision 1 (Effective 7/1/24 through 7/31/24)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Off-Peak/Summer 2024 Rates (Effective 5/1/24 through 6/30/24)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Peak/Winter 2023-2024 Rates Revision 3 (Effective 4/1/24 through 4/30/24)

Berkshire Gas CompanyREVISED

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Peak/Winter 2023-2024 Rates Revision 2 (Effective 2/1/24 through 3/31/24)

Berkshire Gas CompanyREVISED

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Peak/Winter 2023-2024 Rates Revision 1 (Effective 1/1/24 through 4/30/24)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)REVISED

Liberty Utilities - North Attleboro/Fall RiverREVISED

NSTAR Gas Company d/b/a Eversource EnergyREVISED

Peak/Winter 2023-2024 Rates (Effective 11/1/23 through 12/31/23)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Off-Peak/Summer 2023 Rates Revision 4 (Effective 9/1/23 through 10/31/23)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

National Grid - Boston GasREVISED

National Grid - former Colonial GasREVISED

NSTAR Gas Company d/b/a Eversource EnergyREVISED

Off-Peak/Summer 2023 Rates Revision 3 (Effective 8/1/23 through 8/31/23)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

NSTAR Gas Company d/b/a Eversource EnergyREVISED

Off-Peak/Summer 2023 Rates Revision 2 (Effective 7/1/23 through 7/31/23)

Berkshire Gas CompanyREVISED

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

National Grid - Boston GasREVISED

National Grid - former Colonial GasREVISED

Off-Peak/Summer 2023 Rates Revision 1 (Effective 6/1/23 through 6/30/23)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

National Grid - Boston GasREVISED

National Grid - former Colonial GasREVISED

NSTAR Gas Company d/b/a Eversource EnergyREVISED

Off-Peak/Summer 2023 Rates (Effective 5/1/23 through 5/31/23)

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

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Berkshire Gas Company^REVISED

Berkshire Gas Company^REVISED

Berkshire Gas Company^REVISED

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

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

Liberty Utilities - North Attleboro/Fall River^REVISED

NSTAR Gas Company d/b/a Eversource Energy^REVISED

National Grid - Boston Gas^REVISED

National Grid - former Colonial Gas^REVISED

NSTAR Gas Company d/b/a Eversource Energy^REVISED

NSTAR Gas Company d/b/a Eversource Energy^REVISED

Berkshire Gas Company^REVISED

National Grid - Boston Gas^REVISED

National Grid - former Colonial Gas^REVISED

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

National Grid - Boston Gas^REVISED

National Grid - former Colonial Gas^REVISED

NSTAR Gas Company d/b/a Eversource Energy^REVISED