Important Supplier Documents

• Fee Schedule (PDF)
• New Electric Supplier Startup Milestones (PDF)
• Information for ISO New England Load Asset Registration Form (ARF) (.xls file download)
• 2024 Meter Read and Billing Schedule (PDF)
• 2023 Meter Read and Billing Schedule (PDF)
• Competitive Electric Supplier Service Agreement (PDF)
• Rate Template (.xls file download)
• Supplier Adjustment Sample Input (.xls file download)
• Customer Information Release Form (PDF)

Other information

• Generic Rate ICAP tags for 2024 – 2025 (.xls file download)
• Eastern Massachusetts Hourly Profiles (.xls file download)
• NSTAR Loss Factors (.xls file download)

Supplier Testing Instructions

Eversource is now supporting X12 EDI Version 4010 Standards only in Eastern Massachusetts. All new suppliers should be prepared to test with the 4010 Standards prior to contacting the Eversource Electric Business Supplier Representative.

The following test data is available:

• Test Case Account Numbers (PDF)
• Test Case Service Identifiers (PDF)
• Customer Information (PDF)

With the requirement for Disco’s to test with multiple suppliers, and in the interest of completing the testing procedures as efficiently as possible, Eversource would appreciate your completion of the following tasks before you arrange to test Electronic Data Interchange (EDI) processing with us.

1. Complete your application for state licensing to the Massachusetts Department of Public Utilities (DPU). Final licensing approval is not required to begin the testing process.
2. Attendance at a Supplier Training session, a state licensing requirement, is recommended prior to testing.
3. Obtain the EBT Report and EBT Test Plan from the National Grid website. Develop and test processing of your own customer system to handle both the input and output transactions required.
4. Develop or arrange for EDI translation services for input and output transactions. The EDI implementation guides are also on the National Grid website.
5. Make arrangements for and test with a VAN mailbox and appropriate communications software with the VAN.
6. Obtain a Dun and Bradstreet number for your company. This will be your "Supplier ID."
7. Determine Rate Codes and Pricing Structure Codes for Complete Billing options, as well as the actual pricing for each.
8. Check the Supplier section on the NSTAR Electric website for specific information to help you prepare for our test.
9. Review the Differences from Massachusetts State Testing Plan on the Eversource website. This will assist you in determining if your system will require changes before you can successfully process our data.

Differences from Massachusetts State Testing Plan

We have attempted to stay as close as possible to the EBT Test Plan developed for Disco/Supplier testing in Massachusetts. Our customer information system has certain differences and/or constraints that will make some minor changes to the original plan necessary. The changes are outlined below.

• Disco account numbers, meter numbers and an outline of customer test data to be used in pre-enrollment testing with Eversource is available on the company website.
• The four position name field is a requirement for residential account identification in our system. The four position name field is not a requirement for commercial or industrial accounts.
• We will not return an "Address Line 2."
• The street address sent to you will be the same used to print our bills, which has been processed to appear on a single line.
• At this time there will be no foreign country information on mailing addresses. Since there are so few of them, we process the mailing of these bills manually. If you receive an address with the state missing, please call for further information.
• We will require the "Sales Tax Indicator" to be present (Y or N) when you are enrolling a customer for, or changing a customer to 'Complete Billing'. This indicator will be used as received for supplier bill calculation, even if it does not match our records. Suppliers will be responsible for maintaining tax/tax exemption status for their customers.
• The 'Disco Rate Number' is an optional field on the returned administrative records. At this time we do not plan to return our rate numbers, since our system carries them internally with very different codes. Should you require this information, the decoded rate name is printed on the Disco customer bill, and filed rate tariff information is available on the Eversource website.
• Test plan Disco accounts D0000000000003 and D000000000003A will not include a standard electric service and an unmetered service, since we do not mix metered and unmetered services on the same account. Instead, these accounts will include a standard electric service (Service Type Indicator = "E") and a controlled hot water service (Service Type Indicator = "H").
• Test plan Disco account D0000000000017 will not include two (2) Time of Use meters (Service Type Indicator = "T"). Our system bills only one TOU meter per account (although in some cases use from more than one meter is combined for billing), and does not mix TOU meters with any other service type. Therefore, Test plan meter M000000032 will not be used on our test.
• Test plan Disco account D0000000000019 is an unmetered lights account (Service Type Indicator = "L"). The service ID for unmetered services (both "L" and "N") appear decoded on the Disco customer bill. Look elsewhere on this website for the four position unmetered device ID's that would be required for enrollments, etc. The appropriate "Service Type Indicator" for each device ID is listed there also, along with instructions for using the information provided.
• Test Case A-003 uses an intentionally bad Disco account number to produce a sample of an error response record. Replace D999999999999 with 99999999999 in the enrollment record sent.
• Peak/Total kW , Peak kVa, and Billing Demand fields on the billing and usage records sent to you will drop the decimal indicated on the test plan. We do not carry decimals on this data.
• Either Peak/Total kW or Peak kVa demand will be sent on the billing and usage records, but never both. Our billing system bills and stores only the appropriate value for the rate being billed.
• On Time of Use meters, we never bill or store off-peak or shoulder kW or kVa demand.

Load Estimation Methodology

We are streamlining the method of selecting the load profiles for scheduling and settlement. Previously, the rate class was returned in the EDI and used for selecting the correct load profiles and loss voltage.

As of June 4, 2024, we will no longer send the rate class in the EDI but instead send the distinct load profile/tariff name (i.e. R1, G1, G2, EV2 etc.) in the LDC Rate Class field which will match the appropriate load shape and voltage type for determining distribution losses.

There may be multiple load profiles assigned to each Eversource Company. For scheduling and load settlement, we will use the ISO assigned metering domain from the load asset when scheduling and settling customer load in conjunction with the load profile name.

For example:

Supplier hourly load determination

The daily load determination process results in estimated hourly loads for each supplier for the previous day using interval data and customer billing information. These loads are reported to ISO-NE within 37 business hours from the day of dispatch.

On a monthly basis, the estimates are refined by incorporating actual usage data obtained from customer meter readings as well as additional interval readings that may now be available. There are several components in the daily load determination process:

• Select load shapes: Load profiles are generated for each customer within our service territory. Actual hourly load data is used for customers that have interval recorders installed. For all other customers, daily class profiles are estimated utilizing representative historical load research data developed from samples designed to meet regulatory standards.
• Aggregate usage information:  A "usage factor" is calculated for each customer. This usage factor reflects the relationship of each customer’s actual meter read cycle usage to the average usage of customers in their respective class developed from the sample data over the same period.
• Develop preliminary estimates of hourly loads:  A preliminary estimate of each supplier’s hourly loads is produced by scaling the appropriate class profiles, relative to the associated usage factors, and including any telemetered data. Each supplier’s loads will then be aggregated across the classes for a supplier’s daily profile.
• Reconcile to system loads: The suppliers' preliminary hourly loads are compared to the company’s actual hourly metered loads (as metered at the PTF boundary or interconnection point with the distribution company network). The difference, or residual, is allocated to suppliers proportionally to the estimated portion of the suppliers’ loads.

Monthly reconciliation process

The monthly reconciliation process utilizes the same methodology as the daily load determination process and incorporates the most recent customer usage, which is available after monthly meter readings have been processed.

This process also includes hourly demand information from the non-telemetered interval recorders processed after the initial estimate.

Revised supplier values for the calendar month are reconciled to the revised system values for the same time period. Any residual is allocated proportionally to the estimated portion of the supplier's loads. The resulting energy values are reported to ISO-NE within 90 days from the end of the calendar month.