Service Rates
Review our rate descriptions and pricing schedules for commercial and industrial customers. For information on our other rates or detailed information, please view our filed tariff provisions.
Gas Service Rates
Small Commercial Customers
G-41B service is for commercial, industrial, and institutional customers located in the legacy Boston Gas service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy (70) percent of the metered use for the most recent twelve consecutive months of September through August, and whose maximum hourly meter capacity is less than or equal to 500 cubic feet per hour.
G‐41C service is for commercial, industrial, and institutional customers located in the legacy Colonial Gas service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy- two percent (72%) of the metered use for the most recent twelve consecutive months of September through August, and whose metered annual usage is 20,000 Therms (billing units) or less.
G‐41E service is for commercial, industrial, and institutional customers located in the former Essex service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy-three (73) percent of the metered use for the most recent twelve consecutive months of September through August, and whose normal annual use is 22,000 Therms or less.
Delivery Service Rates
(For definitions of these charges, please view the Glossary of terms on your bill. For a complete list of the components of these charges and their values please see the “Current and Historical Delivery Service Rates” section below.)
| Charge | Boston - G-41B | Colonial - G-41C | Essex - G-41E |
|---|---|---|---|
| Customer Charge | $26.00/30 days | $19.00/30 days | $26.00/30 days |
| Gas Delivery Charge* | $0.5687/Therm | $0.6000/Therm | $0.5687/Therm |
| Distribution Adjustment** | $0.4637/Therm | $0.2867/Therm | $0.4637/Therm |
* Also known as the Distribution Charge. Includes the Revenue Decoupling Adjustment Factor (RDAF).
** Also known as the Local Distribution Adjustment Factor (LDAF). The LDAF differs for customers served in National Grid’s legacy Boston Gas service territory and the legacy Colonial Gas service territory.
Rates for Supply Service
View our Supply Costs area for details on our Default Service pricing.
G‐51B service is for commercial, industrial, and institutional customers located in the legacy Boston Gas service territory whose metered use in the most recent peak period of November through April is less than seventy (70) percent of the metered use for the most recent twelve consecutive months of September through August, and whose maximum hourly meter capacity is less than or equal to 500 cubic feet per hour.
G-51C service is for commercial, industrial, and institutional customers located in the legacy Colonial Gas service territory whose metered use in the most recent peak period of November through April is less than seventy-two percent (72%) of the metered use for the most recent twelve consecutive months of September through August, and whose metered annual gas usage is 20,000 Therms (billing units) or less.
G-51E service is for commercial, industrial, and institutional customers located in the former Essex Gas service territory whose metered use in the most recent peak period of November through April is less than seventy-three (73) percent of the metered use for the most recent twelve consecutive months of September through August, and whose normal annual usage is 45,000 Therms or less.
Delivery Service Rates
(For definitions of these charges, please view the Glossary of terms on your bill. For a complete list of the components of these charges and their values please see the “Current and Historical Delivery Service Rates” section below.)
| Charge | Boston - G-51B | Colonial - G-51C | Essex - G-51E |
|---|---|---|---|
| Customer Charge | $26.00/30 days | $19.00/30 days | $26.00/30 days |
| Gas Delivery Charge* | $0.3866/Therm | $0.4087/Therm | $0.3866/Therm |
| Distribution Adjustment** | $0.4637/Therm | $0.2867/Therm | $0.4637/Therm |
* Also known as the Distribution Charge. Includes the Revenue Decoupling Adjustment Factor (RDAF).
** Also known as the Local Distribution Adjustment Factor (LDAF). The LDAF differs for customers served in National Grid’s legacy Boston Gas service territory and the legacy Colonial Gas service territory.
Rates for Supplier Services
View our Supply Costs area for details on our Default Service pricing.
Medium Customers
G-42B service is for commercial, industrial, and institutional customers located in the legacy Boston Gas service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy (70) percent of the metered use for the most recent twelve consecutive months of September through August, and whose maximum hourly meter capacity is between 501 and 1,500 cubic feet per hour.
G-42C service is for commercial, industrial and institutional customers located in the legacy Colonial Gas service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy-two percent (72%) of the metered use for the most recent twelve consecutive months of September through August, and whose metered annual gas usage is greater than or equal to 20,000 and less than or equal to 100,000 Therms (billing units).
G-42E service is for commercial, industrial, and institutional customers located in the former Essex Gas service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy-three (73) percent of the metered use for the most recent twelve consecutive months of September through August, and whose normal annual usage is greater than 22,000 Therms but equal to or less than 100,000 Therms.
Delivery Service Rates
(For definitions of these charges, please view the Glossary of terms on your bill. For a complete list of the components of these charges and their values please see the “Current and Historical Delivery Service Rates” section below.)
| Charge | Boston - G-42B | Colonial - G-42C | Essex - G-42E |
|---|---|---|---|
| Customer Charge | $48.00/30 days | $48.00/30 days | $48.00/30 days |
| Gas Delivery Charge* | $0.5749/Therm | $0.5749/Therm | $0.5749/Therm |
| Distribution Adjustment** | $0.4170/Therm | $0.2814/Therm | $0.4170/Therm |
* Also known as the Distribution Charge. Includes the Revenue Decoupling Adjustment Factor (RDAF).
** Also known as the Local Distribution Adjustment Factor (LDAF). The LDAF differs for customers served in National Grid’s legacy Boston Gas service territory and the legacy Colonial Gas service territory.
Rates for Supplier Services
View our Supply Costs area for details on our Default Service pricing.
G-52B service is for commercial, industrial, and institutional customers located in the legacy Boston Gas service territory whose metered use in the most recent peak period of November through April is less than seventy (70) percent of the metered use for the most recent twelve consecutive months of September through August, and whose maximum hourly meter capacity is between 501 and 1,500 cubic feet per hour.
G-52C service is for commercial, industrial, and institutional customers located in the legacy Colonial Gas service territory whose metered use in the most recent peak period of November through April is less than seventy- two percent (72%) of the metered use for the most recent twelve consecutive months of September through August, and whose metered annual gas usage is greater than 20,000 and less than or equal to 100,000 Therms (billing units).
G-52E service is for commercial, industrial, and institutional customers located in the former Essex Gas service territory whose metered use in the most recent peak period of November through April is less than seventy-three (73) percent of the metered use for the most recent twelve consecutive months of September through August, and whose normal annual usage is greater than 45,000 Therms and less than or equal to 180,000 Therms.
Delivery Service Rates
(For definitions of these charges, please view the Glossary of terms on your bill. For a complete list of the components of these charges and their values please see the “Current and Historical Delivery Service Rates” section below.)
| Charge | Boston - G-52B | Colonial - G-52C | Essex - G-52E |
|---|---|---|---|
| Customer Charge | $48.00/30 days | $48.00/30 days | $48.00/30 days |
| Gas Delivery Charge* | $0.3671/Therm | $0.3671/Therm | $0.3671/Therm |
| Distribution Adjustment** | $0.4170/Therm | $0.2814/Therm | $0.4170/Therm |
* Also known as the Distribution Charge. Includes the Revenue Decoupling Adjustment Factor (RDAF).
** Also known as the Local Distribution Adjustment Factor (LDAF). The LDAF differs for customers served in National Grid’s legacy Boston Gas service territory and the legacy Colonial Gas service territory.
Rates for Supplier Services
View our Supply Costs area for details on our Default Service pricing.
Large Customers
G-43B service is for commercial, industrial, and institutional customers located in the legacy Boston Gas service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy (70) percent of the metered use for the most recent twelve consecutive months of September through August, and whose maximum hourly meter capacity is between 1,501 and 12,000 cubic feet per hour.
G-43C service is for commercial, industrial, and institutional customers located in the legacy Colonial Gas service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy- two percent (72%) of the metered use for the most recent twelve consecutive months of September through August, and whose metered annual gas usage is greater than 100,000 Therms (billing units).
G-43E service is for commercial, industrial, and institutional customers located in the former Essex Gas service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy-three (73) percent of the metered use for the most recent twelve consecutive months of September through August, and-whose normal annual usage is greater than 100,000 Therms.
Delivery Service Rates
(For definitions of these charges, please view the Glossary of terms on your bill. For a complete list of the components of these charges and their values please see the “Current and Historical Delivery Service Rates” section below.)
| Charge | Boston - G-43B | Colonial - G-43C | Essex - G-43E |
|---|---|---|---|
| Customer Charge | $125.00/30 days | $125.00/30 days | $125.00/30 days |
| Gas Delivery Charge* | $0.5377/Therm | $0.5377/Therm | $0.5377/Therm |
| Distribution Adjustment** | $0.4046/Therm | $0.2357/Therm | $0.4046/Therm |
* Also known as the Distribution Charge. Includes the Revenue Decoupling Adjustment Factor (RDAF).
** Also known as the Local Distribution Adjustment Factor (LDAF). The LDAF differs for customers served in National Grid’s legacy Boston Gas service territory and the legacy Colonial Gas service territory.
Rates for Supplier Services
View our Supply Costs area for details on our Default Service pricing.
G-53B service is for commercial, industrial, and institutional customers located in the legacy Boston Gas service territory whose metered use in the most recent peak period of November through April is less than seventy (70) percent of the metered use for the most recent twelve consecutive months of September through August, and whose maximum hourly meter capacity is between 1,501 and 12,000 cubic feet per hour.
G-53C service is for commercial, industrial, and institutional customers located in the legacy Colonial Gas service territory whose metered use in the most recent peak period of November through April is less than seventy-two percent (72%) of the metered use for the most recent twelve consecutive months of September through August, and whose metered annual gas usage is greater than 100,000 Therms (billing units).
G-53E service is for commercial, industrial, and institutional customers located in the former Essex Gas service territory whose metered use in the most recent peak period of November through April is less than seventy-three (73) percent of the metered use for the most recent twelve consecutive months of September through August, and whose normal annual usage is greater than 180,000 Therms.
Delivery Service Rates
(For definitions of these charges, please view the Glossary of terms on your bill. For a complete list of the components of these charges and their values please see the “Current and Historical Delivery Service Rates” section below.)
| Charge | Boston - G-53B | Colonial - G-53C | Essex - G-53E |
|---|---|---|---|
| Customer Charge | $125.00/30 days | $125.00/30 days | $553.00/30 days |
| Gas Delivery Charge* | $0.2620/Therm | $0.2620/Therm | $2.2626/MDCQ |
| Distribution Adjustment** | $0.4046/Therm | $0.2357/Therm | $0.4046/Therm |
* Also known as the Distribution Charge. Includes the Revenue Decoupling Adjustment Factor (RDAF).
** Also known as the Local Distribution Adjustment Factor (LDAF). The LDAF differs for customers served in National Grid’s legacy Boston Gas service territory and the legacy Colonial Gas service territory.
Rates for Supplier Services
View our Supply Costs area for details on our Default Service pricing.
Extra-Large Customers
G-44B service is for commercial, industrial, and institutional customers located in the legacy Boston Gas service territory whose metered use in the most recent peak period of November through April is greater than or equal to seventy (70) percent of the metered use for the most recent twelve consecutive months of September through August, and whose maximum hourly meter capacity is greater than 12,000 cubic feet per hour.
G-54B service is for commercial, industrial, and institutional customers located in the legacy Boston Gas service territory whose metered use in the most recent peak period of November through April is less than seventy (70) percent of the metered use for the most recent twelve consecutive months of September through August, and whose maximum hourly meter capacity is greater than 12,000 cubic feet per hour.
Delivery Service Rates
(For definitions of these charges, please view the Glossary of terms on your bill. For a complete list of the components of these charges and their values please see the “Current and Historical Delivery Service Rates” section below.)
Charge | Load Factors | |
|---|---|---|
| G-44B | G-54B |
| Customer Charge | $553.00/30 days | $553.00/30 days |
| Gas Delivery Charge* | $2.5742/MDCQ | $2.2626/MDCQ |
| Distribution Adjustment** | $0.3496/Therm | $0.3496/Therm |
* Also known as the Distribution Charge. Includes the Revenue Decoupling Adjustment Factor (RDAF).
** Also known as the Local Distribution Adjustment Factor (LDAF).
Rates for Supplier Services
View our Supply Costs area for details on our Default Service pricing.
Gas Lighting
Available to any customer located in the legacy Boston Gas service territory for gas used for the purpose of street lighting.
Service Rates (G-7B)
| Charge | Service Rate |
|---|---|
| Monthly Customer Charge per Lamp | $1.63/30 Days |
| Volumetric / Hourly Conversion | $0.0424 therms/ hour |
| Monthly CGA + LDAF Charge per Lamp (with clock) | $14.39 |
| Monthly CGA + LDAF Charge per Lamp (without clock) | $30.81 |
*Includes the Local Distribution Adjustment Factor (LDAF) and the Gas Adjustment Factor (GAF).
Available for outdoor gas lighting where a standard gas light is attached to the Company’s existing distribution system and when it is not feasible to meter gas for such lighting along with other gas used on the premises and bill the same under the rate in effect for all other services. All such installations shall be on private property.
Service Rates (G-17B, G-17C)
Charge | Service Rate | |
|---|---|---|
| Boston - G-17B | Colonial - G-17C |
| Monthly Customer Charge per Lamp | $3.33/30 Days | $3.33/30 Days |
| Monthly CGA + LDAF Charge per Lamp* | $32.57 | $28.75 |
*Includes the Local Distribution Adjustment Factor (LDAF) and the Gas Adjustment Factor (GAF).
Current and Historical Delivery Service Rates
The tables below contain historical National Grid Gas Delivery Service Rates as approved by the Massachusetts Department of Public Utilities. The Boston Gas Company summaries include rates for customers receiving service on the former Colonial Gas Company rate classes as of November 1, 2021, and the former Essex Gas Company as of November 1, 2016.
| Boston Gas |
|---|
| May 1, 2026 |
| November 1, 2025 |
| October 1, 2025 |
| May 1, 2025 |
| April 1, 2025 |
| March 1, 2025 |
| November 1, 2024 |
| October 1, 2024 |