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Net metering measures the difference between the electricity supplied over the electric distribution system (by your utility company) and the electricity generated by an eligible on-site generator and fed back into the distribution system. The meter registers the flow of electricity in both directions, and only the net amount is billed (or credited) each month.

By installing an on-site generator, you may be able to reduce the amount of energy purchased from your energy supplier (typically your utility company) and receive compensation for excess energy (exported energy to the grid) produced by your on-site generator. This credit can be applied later to your future kWh usage.

In months when the on-site generator produces more energy than is consumed, the customer will be billed for zero energy and the excess energy is "banked" as an offset to energy consumed in future months.  If the excess amount banked exceeds 600 kWh at the end of the March billing cycle each year, the customer will have the option to continue to bank the kWh towards future months or may elect to receive the economic value of the surplus kWh as a bill credit or one-time payment. The economic value of the surplus kWh will be determined in accordance with the NHPUC 900 rules.
 
As defined in RSA 362-A:1, II-b per the New Hampshire Public Utilities Commission (NHPUC), an eligible customer is an electric utility customer who fulfills one or more of the following:
  • Owns or operates an electrical generating facility (on-site generator) powered by renewable energy that has a capacity of not more than 1,000 kilowatts
  • Owns and operates a heat-led combined heat and power system (on-site generator) that has a capacity of 100 kilowatts or more but less than or equal to 1,000 kilowatts, which began operating after July 1, 2010
  • Owns or operates a heat-led combined heat and power system  (on-site generator), with a total peak generating capacity of not more than 100 kilowatts that was installed on or before July 1, 2010
AND
 
The on-site generator:
  • Is located behind a retail meter on the customer's premises
  • Is interconnected and operates in parallel with the electric grid
  • Is primarily used to offset the customer's own electricity requirements

Group Net Metering
 
NHPUC established new rules regarding Group Net Metering effective January 8, 2015  PUC 900 Rules
 
For customers approved to be Group hosts by the NH PUC, payments will begin in the bill cycle following the first meter read date after your approval in accordance with the NH PUC rules.  Payments for net excess generation will be made at full retail rates only for customers who are receiving energy service from Unitil.

 
Other Useful Resources:
NHPUC Requirements (PUC Rule 900) - rules and technical requirements for net metering set forth by the New Hampshire Public Utilities Commission
 
 
 
Notice to Customers Interested in Net Metering
 
Generating facilities with a nameplate rating greater than 10 kW AC single-phase or 25 kW AC three-phase must apply for registration of a cap allocation with the MassACA. If you have not already done so, please contact the MassACA to apply for a cap allocation in the Net Metering queue. New Solar Customers who are not Cap exempt or Municipal and submit an application after September 26, 2016 at 2:00 p.m. will receive Market Net Metering Credits (60% of excess kWh is credited). Customers with questions can email generator@unitil.com or call 603-773-6480. 
 
The Commonwealth of Massachusetts requires each electric utility to provide net metering to customers with qualifying generation systems.  There is, however, a limitation on the amount of generation that is eligible to be net metered on each electric utility’s system. This is known as the statutory “cap” on net metering capacity. Each electric utility, including Unitil, is required to limit the combined generation capacity of all non-exempt net metering facilities to 7% of the utility’s historic peak load for non-municipal (“Private”) customers and 8% of the historic peak for municipal (“Public”) customers.  Accordingly, for Unitil, the maximum amount of non-municipal generation eligible for net metering (Unitil’s Private cap) is 7.14 MW.  The maximum amount of municipal generation eligible for net metering (Unitil’s Public cap) is 8.16 MW. Unitil is required by law to limit the net metering capacity in accordance with these caps.  See, G.L. c. 164 s. 139.  Renewable energy generating facilities with a nameplate rating of less than 10 kW single-phase, or 25 kW three-phase are exempt from the net metering cap.
 
The final determination of eligibility for net metering is made after it is installed and at the time the generation system has had its final inspection and commissioning test and is issued the Approval to Interconnect by Unitil.  As a result, net metering may not be available to some applicants who request it, even if they have an approval to install the generation facility. In the event that the net metering cap has been fully subscribed, interconnection of customer generation to Unitil’s electric distribution system is still allowed, but not under the Net Metering Tariff, and Net Metering Credits would not be available for any of the excess electricity generated by the customer’s facility.
 
Please see the chart at the bottom of this page for more information regarding the status of capacity remaining in regards to the private and municipal caps. Should you have any questions please feel free to call our office at 888-301-7700.  We look forward to working with you.
Please see the chart below for more information regarding the status of capacity remaining in regards to the Unitil New Hampshire system cap. Should you have any questions please feel free to call our office at 800-852-3339.  We look forward to working with you.
 
 
The Massachusetts Department of Public Utilities approved Unitil's Net Metering Tariff, effective January 6, 2017. The Green Communities Act provides for three classes of net metering customers:
  • Class 1: Anaerobic Digestion/wind/agricultural generation, 60 kW and less
  • Class 1 Solar: 60 kW and less using sunlight
  • Class 1 Other: All other generation (non-renewable) 60 kW and less
  • Class 2: Anaerobic Digestion/wind/agricultural generation over 60 kW to 1,000 kW
  • Class 2 Solar: Sunlight generation over 60 kW up to 1,000 kW
  • Class 3: Anaerobic Digestion/wind/agricultural generation over 1,000 kW to 2,000 kW
  • Class 3 Solar: Sunlight generation over 1,000 kW up to 2,000 kW
 
Municipal or Government Entities
A customer wishing to be certified as a municipal or other governmental entity MUST be certified by the D.P.U. as such before the company can provide net metering service or allocate credits under the public net metering cap. Please complete the government application below and submit to the D.P.U. and the Company.
 
Net Metering
In addition to the Interconnection Application, an eligible customer must complete and submit Schedule Z in order to be considered for Net Metering.
 
System of Assurance
In order to guarantee a position under the net metering Caps, all non Cap exempt Customers must apply for allocation under the Massachusetts System of Assurance for Net Metering.
 
Other Important Net Metering Information
Under the net metering rules, customers that are net exporters of power for the month will receive a credit on their monthly bill based on the following formula:

Class 1 and 2 customers and municipal/governmental Class 3 customers whose generation is wind, solar, anaerobic digestion or agricultural will receive credit equal to the excess kilowatt-hours (kWh) by time-of-use rates, if applicable, and the product of the sum of the following charges applicable to the rate class under which the customer takes service:
  • Basic service kWh charge
  • Distribution kWh charge
  • Transmission kWh charge
  • Transition kWh charge

Other Class 3 customers will receive credit equal to the excess kilowatt-hours (kWh) by time-of-use rates, if applicable, and the product of the sum of the following charges applicable to the rate class under which the customer takes service:
  • Basic service kWh charge
  • Transmission kWh charge
  • Transition kWh charge

New Solar Net Metering Facilities and other Solar Net Metering Facilities that are not Cap Exempt Facilities after 25 years from the date that each Solar Net Metering Facility was first authorized to interconnect shall receive Market Net Metering Credits. Class 1 customers whose generation is not solar, wind, anaerobic digestion or agricultural will continue to receive the average loss-adjusted monthly clearing price set by ISO New England.
 
Historical Peak Load: 102 MW (July 27, 2005)
Private Cap Exempt Customers as of June 2017: 6.70 MW*
   
Non-Municipal Customers  
Net Metering Cap (Private): 7.14 MW (7% of historical peak load)
Net Metering Online as of June 2017: 4.84 MW*
Amount Remaining: 2.30 MW*

Completed Applications Pending:

See public/private cap information

at https://app.massaca.org/allocationreport/report.aspx.

   
Municipal Customers & Other Government Entities  
Net Metering Cap (Public): 8.16 MW (8% of historical peak load)
Net Metering Online as of June 2017: 3.29 MW*
Amount Remaining: 4.87 MW*
Completed Applications Pending:

See public/private cap information

at https://app.massaca.org/allocationreport/report.aspx.

*Calculated using 80% estimated DC rating for solar pv.

Unitil Energy Systems Net Metering Cap Allocation Status

May 1, 2017

  Facilities In Service Facilities Granted Queue Position Facilities on Waitlist
Description Amount (kW) Number Capacity (kW) Number Capacity (kW) Number Capacity (kW)
Original Cap 6,170 630 5,755 11 221 - -
Expanded Cap for projects up to 100kW 5,240 37 276 37 405 - -
Expanded Cap for projects 100kW+ 1,310 0 0 1 444 - -
Total Allocated Capacity (kW)

12,720

667

6,031

49

1,070

- -
 
 

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