National Grid
How Bills are Determined

Net Import/Net Export Net metering looks at power imported or exported over a billing period (aka billing month). Over the month your meter may run forwards or backwards at different times, and we look at the net use of power over the month - in essence just going with the previous and current meter readings to determine net import or export of power.


  • Net Import Of Power Over Billing Month

  • If your generation system produces less power during a billing month than your facility/home uses during that billing month, you only have to pay for the net amount of power you draw from the grid. The power you generate and use on site is worth "full retail value".

    For example, if your generator produces 700 kWh over a billing month, but you use 1,000 kWh in your facility/home, you will have a net import (use) of 300 kWH over the billing period. You will only have to pay energy charges on the net 300 kWh. The power you generate has a real value equivalent to the full retail value.

  • Net Export Of Power Over Billing Month

    • If you are a non-demand metered solar, farm waste or wind customer and your generation system produces more power than your facility/home uses during the month over which you are billed, the excess power is credited to your account and carried over to the next month.

      For Example: If you use 1,000 kWh in you facility/house over a month, but your generator produces 1,300 kWh, you will export a net 300 kWh to the grid. This 300 kWh credit will roll over to your next month’s bill to credit to your next month’s usage.

    • If you are a demand metered solar, farm waste or wind customer and your generation system produces more power than your facility uses during the month over which you are billed during that month, the excess power is converted to a cash value and applied as a direct credit to your outstanding energy, customer, demand and other charges.


      For example, if you use 1,000 kWh in your facility over a month, but your generator produces 1,300 kWh, you will export a net 300 kWH to the grid. This 300 kWh will be converted to a dollar amount by adding the delivery per kWh charge and energy per kWh charge times the excess kWh (example: Delivery + Commodity = Credit*kWh). 


                  Delivery                          $.05000


                  Commodity                    $.05000


                  Total Credit                    $.10000 * 300 = $30.00 Credit


      This amount will be used to credit your outstanding customer, demand and other charges for that month.  Any excess will be converted to its equivalent kWh and carried over to the next month

Regardless of a net import or export of power during a billing period, the customer charge and demand charges are still applied and must be paid for if not covered by the credits described above.

 

Qualifying Facilities per FERC Qualifying Facilities have several options on metering and billing. For a description of qualifying facilities please see the Electric-Qualifying Facilities* webpage on the Federal Energy Regulatory Commission's website.

 

 

For more information on the options for Qualifying Facilities, view our rates and tariffs at on our PSC 220 Rate Tariff (pdf): 

 

For additional information, visit our  Interconnection of Generators section.



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