|Net metering facility|
|≤ 60 kW||bidirectional meter||bidirectional meter|
|> 60 kW but ≤ 1 MW||dual register interval meter||bidirectional meter|
|> 1 MW but ≤ 2 MW||dual register interval meter||bidirectional meter|
|> 2 MW||dual register interval meter||N/A|
The bidirectional meter (also known as a net meter) reads your "net" usage over the course of a billing period. The electric company may use a dual register non-interval meter in order to separately measure your net usage, and your net export. However, the electric company will sum your net usage and your net export to calculate your net usage. A dual register interval meter separately measures the real-time your net usage and your net export. Since the meter is an interval meter, it measures and records both your net usage and your net export for specific time intervals (e.g. 5-minute intervals) over the course of the billing period. The net usage and net export can never occur at the same time.
Compensation for excess generation
Determining excess generation
- QF: The netting of energy imports and exports happens on an hourly basis. You electric utility will determine the value of your excess generation and send you a check for that amount.
- Net metering facility: The netting of energy imports and exports happens on a monthly basis. Any excess generation appears as a credit on your electric bill.
Qualifying facilities compensation
|< 1 MW||> 1 MW|
|Average monthly clearing price at ISO-NE (energy and capacity)||X|
|Hourly price of electricity at ISO-NE||X|
Net metering compensation
|Class I||Class I renewable||Class II||Class III|
|Average monthly clearing price at ISO-NE (energy)||X|
* Only applies to class III municipalities and governmental entities under the old regime and class III net metering facilities in the new regime.
The following rates are never included in the calculation of compensation for excess generation:
- Fixed customer charges,
- System benefit charges, including both the energy efficiency charge (also known as demand side management) and the renewable energy charge, and
- Demand charges (e.g. $/kW or $/kVa charges).
To see all document filings, please visit the file room and type the case’s filing number using the following format: XX-XX. The first two digits in a filing number represent the year the case was opened. The following digits are assigned sequentially for all cases opened in that year.
Policy investigations and rulemakings
|Case number||Subject of investigation or rulemaking|
|D.P.U. 17-54||Investigation commencing a rulemaking pursuant to Sections 201 and 210 of Title II of the Public Utility Regulatory Policies Act of 1978, G.L. c. 30A, § 2, and 220 CMR 2.00 et seq., to amend 220 CMR 8.00 et seq.|
|D.T.E. 99-38||Investigation into commencing a rulemaking to modify 220 CMR 8.00 et seq.|
|D.T.E. 92-208||Investigation into the Qualifying Facility Power Purchase Rate P Tariff No. 859, filed with the Department on September 15, 1992 to become effective February 1993 by Massachusetts Electric Company|
Petitions to the DPU
|Case number||Subject of petition|
|D.P.U. 11-59||Petition of Allco Renewable Energy Limited for an investigation into Allco's offer to sell generation output from various qualifying facilities within the meaning of 220 CMR 8.02|
|D.P.U. 11-57||Petition of Allco Renewable Energy Limited for amendment by the Department of Public Utilities of the provisions of 220 CMR 8.01 et seq., with respect to sales of electricity by a renewable energy qualifying facility|
|D.T.E. 92-201||Petition of L'Energia Limited Partnership for an expedited investigation and interpretation of certain tariff requirements as set forth in the Massachusetts Electric Company Qualifying Facility Power Purchase Rate P|