Federal Energy Regulatory Commission (“FERC”) Overview of Qualifying Facilities


Department of Public Utilities Regulations

220 CMR 8.00 et seq. pdf format of 220 CMR 8.00


Net Metering versus Qualifying Facilities

Meter Comparison:

 220 C.M.R. 8.00 et seq. (QFs)220 C.M..R. 18.00 et seq. (Net Metering)
≤ 60 kWBidirectional MeterBidirectional Meter
> 60 kW but ≤ 1 MWDual Register Interval MeterBidirectional Meter
> 1 MW, but ≤ 2 MWDual Register Interval MeterBidirectional Meter
> 2 MWDual Register Interval MeterN/A

Bidirectional Meter: also known as a net meter. This meter reads the "net" usage of a customer over the course of a billing period (approximately one month).  Please note that a distribution company may use a dual register non-interval meter in order to separately measure (1) the net usage of the customer, and (2) the net export of the customer.  However, the sum of both (1) and (2) will be tallied for a billing period in order to calculate the net usage of the customer.
Dual Register Interval Meter: separately measures the real-time: (1) net usage of the customer; and (2) the net export of the customer.  Since the meter is an interval meter, it measures and records both (1) and (2) for specific time intervals (e.g. five-minute intervals) over the course of the billing period.  Please note that net usage and net export can never occur at the same time.


Excess Generation Comparison:

 Units220 C.M.R. 8.00 et seq.
220 C.M.R. 18.00 et seq.
(Net Metering)
< 1 MW≥ 1 MWClass 1Class I- Solar, Wind, & AGClass IIClass III
DeliveryDistribution Charge¢/kWh   XX*
Transmission Charge¢/kWh   XXX
Transition Charge¢/kWh   XXX
SupplyBasic Service¢/kWh   XXX
GenerationAverage Monthly Clearing Price at the ISO-NE (Energy)¢/kWh  X   
Average Monthly Clearing Price at the ISO-NE (Energy & Capacity)¢/kWh & ¢/kW per monthX     
Hourly Price of Electricity at ISO-NE¢/kWh X    
 * Only applies to class III municipalities and governmental entities

Please note that 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 (a.k.a. demand side management “DSM”) and the renewable energy charge; and
  • Demand charges (e.g. $/kW or $/kVa charges).


Open and Closed Qualifying Facility and On-Site Generation Facilities Dockets

To see all document filings, please visit the file room and type the case’s docket number using the following format: XX-XX
The first two digits in a docket number represent the year the case was opened.  The following digits are assigned sequentially for all cases opened in that year.

Policy Investigations

D.T.E. 99-38Investigation into commencing a rulemaking to modify 220 C.M.R. §§ 8.00 et seq.Closed
D.T.E. 92-208Investigation 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 CompanyClosed


Petitions to the Department

D.P.U. 11-59Petition 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 C.M.R. § 8.02Open
D.P.U. 11-57Petition of Allco Renewable Energy Limited for amendment by the Department of Public Utilities of the provisions of 220 C.M.R. § 8.01 et seq., with respect to sales of electricity by a renewable energy qualifying facilityClosed
D.T.E. 92-201Petition 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 PClosed



This information is provided by the Department of Public Utilities.

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