Information on Gas Supply and Delivery Charges

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.

The DPU’s Role in Gas Rates

The DPU’s role in reviewing the gas companies’ requests is limited. When the gas companies submit their winter gas rate adjustments, it is the DPU’s job to ensure that all the information provided by the companies is accurate and that the projected costs the companies request for the gas they purchase do not include any costs other than what they’ve paid for it. The DPU can deny or adjust the costs proposed by the companies only if the information is not accurate or is inconsistent with regulations.  This recovery occurs on a dollar-for-dollar basis, meaning that the gas companies do not make a profit from the sale of the gas purchased. Customers of a gas company pay the exact amount it costs the company to acquire the gas, without any mark-up. 

Gas Supply Rate Information (GAF)

The gas companies purchase natural gas on behalf of their customers and pay the market-based price. The DPU does not regulate the price of gas, as the price is determined by the market since Congress deregulated the price of gas in 1989. The cost of the 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.  Find your gas company.

The cost of gas is composed of the following components:

• The cost of the natural gas purchased at price determined by competitive gas markets;

• Transportation costs to deliver the gas from its source area through pipelines into Massachusetts, which are recovered through rates set by the Federal Regulatory Energy Commission (FERC);

• The cost of storage facilities and the gas that is stored in summer and used in winter;

• The cost of liquefied natural gas (LNG) that is used on cold days to ensure homes and buildings are properly heated; and

• The reconciliation component: If gas companies under-recover in the prior winter (because actual costs are higher than projected costs), they recover those costs with interest. If there is an over-recovery of costs, the companies give it back to customers with interest. 

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. 

Gas Delivery Charges

The local distribution adjustment factor, or LDAF, is a critical component to ensure the gas heating your home is provided safely while meeting legislative regulations, such as the costs for energy efficiency measures offered by your utility, and the costs to provide rate assistance to income eligible customers.  

LDAF Rate Information

The 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.

Part of the LDAF charge supports the funding of discounts for income-eligible households, helping them afford their energy needs without undue financial stress. These programs are also known as Residential Assistance programs. The gas companies offer different programs to help income-eligible families and customers manage their energy bills, save energy, and access additional assistance. This includes a discount rate on gas for qualifying customers and financial assistance to customers enrolled in the Home Energy Assistance Program (HEAP). 

If you think you might be eligible to receive assistance from your gas company, contact your provider here:

• Berkshire Gas
• Eversource
• Liberty Utilities
• National Grid
• Unitil 

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. 

Off-Peak/Summer 2025 Rates (Effective 5/1/25 through 10/31/25)

Berkshire Gas Company

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.6353	0.6513
G-41/G-51	$/Therm	0.6353	0.1706
G-42/G-52	$/Therm	0.6353	0.1881
G-43/G-53	$/Therm	0.6353	0.1598
T-54	$/Therm	0.6353	0.0233

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	0.4156	0.9473
Residential Heating R-3, R-4	$/Therm	0.4984	0.9473
G-40	$/Therm	0.4984	0.3202
G-41	$/Therm	0.4984	0.2130
G-42	$/Therm	0.4984	0.2661
G-43	$/Therm	0.4984	0.2116
G-50	$/Therm	0.4156	0.3202
G-51	$/Therm	0.4156	0.2130
G-52	$/Therm	0.4156	0.2661
G-53	$/Therm	0.4156	0.2116

Fitchburg Gas d/b/a Unitil

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.4333	1.0935
Residential Heating R-3, R-4	$/Therm	0.5046	1.2733
G-41	$/Therm	0.5046	0.4621
G-42	$/Therm	0.5046	0.2961
G-43	$/Therm	0.5046	0.2610
G-51	$/Therm	0.4333	0.4621
G-52	$/Therm	0.4333	0.2961
G-53	$/Therm	0.4333	0.2610

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.6530	0.4119
G-41, G-42, G-43	$/Therm	0.6530	0.3509
G-51, G-52, G-53	$/Therm	0.6530	0.3223

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.2954	0.7896
G-41, G-42, G-43	$/Therm	0.2954	0.5992
G-51, G-52, G-53	$/Therm	0.2954	0.5199

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.5148	1.0309
G-41B/E, G-51B/E	$/Therm	0.5148	0.3803
G-42B/E, G-52B/E	$/Therm	0.5148	0.3469
G-43B/E, G-53B/E	$/Therm	0.5148	0.3226
G-44B, G-54B	$/Therm	0.3743	0.2774
G-44B, G-54B	$/MDCQ Therms	1.4661

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.5148	0.8960
G-41, G-51	$/Therm	0.5148	0.2352
G-42, G-52	$/Therm	0.5148	0.2288
G-43, G-53	$/Therm	0.5148	0.1839

NSTAR Gas Company d/b/a Eversource Energy

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.4242	1.2059
Residential Heating R-3, R-4	$/Therm	0.4242	1.2059
G-41, G-51	$/Therm	0.4242	0.3588
G-42, G-52	$/Therm	0.4242	0.3180
G-43, G-53, T-1	$/Therm	0.4242	0.2310

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

Berkshire Gas Company^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.3714	(0.0120)
G-41/G-51	$/Therm	0.3714	0.1456
G-42/G-52	$/Therm	0.3714	0.1377
G-43/G-53	$/Therm	0.3714	0.1215
T-54	$/Therm	0.3714	0.0103

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	0.7437	0.2556
Residential Heating R-3, R-4	$/Therm	0.9392	0.3367
G-40	$/Therm	0.9392	0.2639
G-41	$/Therm	0.9392	0.1876
G-42	$/Therm	0.9392	0.2248
G-43	$/Therm	0.9392	0.1905
G-50	$/Therm	0.7437	0.2639
G-51	$/Therm	0.7437	0.1876
G-52	$/Therm	0.7437	0.2248
G-53	$/Therm	0.7437	0.1905

Fitchburg Gas d/b/a Unitil 

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.4846	0.5356
Residential Heating R-3, R-4	$/Therm	0.8035	0.5692
G-41	$/Therm	0.8035	0.5624
G-42	$/Therm	0.8035	0.4066
G-43	$/Therm	0.8035	0.3659
G-51	$/Therm	0.4846	0.5624
G-52	$/Therm	0.4846	0.4066
G-53	$/Therm	0.4846	0.3659

Liberty Utilities - Blackstone (formerly Blackstone Gas Company)

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.7579	0.1314
G-41, G-42, G-43	$/Therm	0.7579	(0.0397)
G-51, G-52, G-53	$/Therm	0.7579	(0.0678)

Liberty Utilities - North Attleboro/Fall River

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8272	0.4693
G-41, G-42, G-43	$/Therm	0.8272	0.1803
G-51, G-52, G-53	$/Therm	0.8272	0.1066

National Grid - Boston Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8467	0.3219
G-41B/E, G-51B/E	$/Therm	0.8467	0.3266
G-42B/E, G-52B/E	$/Therm	0.8467	0.3034
G-43B/E, G-53B/E	$/Therm	0.8467	0.2852
G-44B, G-54B	$/Therm	0.3416	0.2513
G-44B, G-54B	$/MDCQ Therms	8.3768

National Grid - former Colonial Gas

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8467	0.2253
G-41, G-51	$/Therm	0.8467	0.2233
G-42, G-52	$/Therm	0.8467	0.2165
G-43, G-53	$/Therm	0.8467	0.1802

NSTAR Gas Company d/b/a Eversource Energy 

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.9260	0.4849
Residential Heating R-3, R-4	$/Therm	0.9260	0.6068
G-41, G-51	$/Therm	0.9260	0.3168
G-42, G-52	$/Therm	0.9260	0.2874
G-43, G-53, T-1	$/Therm	0.9260	0.2070

Peak/Winter 2024-2025 Rates Revision 3 (Effective 3/1/25 through 4/30/25)

Berkshire Gas Company^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.9044	(0.0120)
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)^REVISED

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.7437	0.2556
Residential Heating R-3, R-4	$/Therm	0.9392	0.3367
G-40	$/Therm	0.9392	0.2639
G-41	$/Therm	0.9392	0.1876
G-42	$/Therm	0.9392	0.2248
G-43	$/Therm	0.9392	0.1905
G-50	$/Therm	0.7437	0.2639
G-51	$/Therm	0.7437	0.1876
G-52	$/Therm	0.7437	0.2248
G-53	$/Therm	0.7437	0.1905

Fitchburg Gas d/b/a Unitil ^REVISED

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.4846	0.5356
Residential Heating R-3, R-4	$/Therm	0.8035	0.5692
G-41	$/Therm	0.8035	0.5624
G-42	$/Therm	0.8035	0.4066
G-43	$/Therm	0.8035	0.3659
G-51	$/Therm	0.4846	0.5624
G-52	$/Therm	0.4846	0.4066
G-53	$/Therm	0.4846	0.3659

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

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.7579	0.1314
G-41, G-42, G-43	$/Therm	0.7579	(0.0397)
G-51, G-52, G-53	$/Therm	0.7579	(0.0678)

Liberty Utilities - North Attleboro/Fall River^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8272	0.4693
G-41, G-42, G-43	$/Therm	0.8272	0.1803
G-51, G-52, G-53	$/Therm	0.8272	0.1066

National Grid - Boston Gas^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8467	0.2951
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^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.8467	0.1985
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 ^REVISED

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.9260	0.4849
Residential Heating R-3, R-4	$/Therm	0.9260	0.6068
G-41, G-51	$/Therm	0.9260	0.3168
G-42, G-52	$/Therm	0.9260	0.2874
G-43, G-53, T-1	$/Therm	0.9260	0.2070

Peak/Winter 2024-2025 Rates Revision 2 (Effective 2/1/25 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)^REVISED

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.7437	0.5904
Residential Heating R-3, R-4	$/Therm	0.9392	0.5904
G-40	$/Therm	0.9392	0.2639
G-41	$/Therm	0.9392	0.1876
G-42	$/Therm	0.9392	0.2248
G-43	$/Therm	0.9392	0.1905
G-50	$/Therm	0.7437	0.2639
G-51	$/Therm	0.7437	0.1876
G-52	$/Therm	0.7437	0.2248
G-53	$/Therm	0.7437	0.1905

Fitchburg Gas d/b/a Unitil ^REVISED

Rate Class	Billing Unit	GAF	LDAF
Residential Non-Heating R-1, R-2	$/Therm	0.4846	0.9242
Residential Heating R-3, R-4	$/Therm	0.8035	0.9242
G-41	$/Therm	0.8035	0.6010
G-42	$/Therm	0.8035	0.4276
G-43	$/Therm	0.8035	0.3816
G-51	$/Therm	0.4846	0.6010
G-52	$/Therm	0.4846	0.4276
G-53	$/Therm	0.4846	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 ^REVISED

Rate Class	Billing Unit	GAF	LDAF
All Residential	$/Therm	0.9260	0.8768
G-41, G-51	$/Therm	0.9260	0.3168
G-42, G-52	$/Therm	0.9260	0.2874
G-43, G-53, T-1	$/Therm	0.9260	0.2070

Peak/Winter 2024-2025 Rates Revision 1 (Effective 1/1/25 through 2/1/25)

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	0.5904
Residential Heating R-3, R-4	$/Therm	0.7920	0.6135	0.5904
G-40	$/Therm	0.7920	0.2821	0.2639
G-41	$/Therm	0.7920	0.1927	0.1876
G-42	$/Therm	0.7920	0.2357	0.2248
G-43	$/Therm	0.7920	0.1959	0.1905
G-50	$/Therm	0.5965	0.2821	0.2639
G-51	$/Therm	0.5965	0.1927	0.1876
G-52	$/Therm	0.5965	0.2357	0.2248
G-53	$/Therm	0.5965	0.1959	0.1905

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

Last updated:	February 3, 2025