Your solar account with Hingham Municipal Lighting Plant (HMLP) has two meters, one is a bi- directional which measures what you receive from us and what you send to us and the other is the solar meter, which produce 3 different reads. Near the top of your bill you will see METER READINGS. In that section you will find the readings, in kWh, captured by those meters. We use those numbers to calculate your bill. The information on the first line line in that section represents the data captured by the solar meter. This line reads SOL which is short for SOLar. The number on that line denotes how many kWh your solar array produced. The information on the second line comes from the bi-directional meter, which is a regular utility grade electric meter, that measures the electricity that you purchase and use from HMLP. On your bill the information captured by that meter appears on the line that reads DEL which is short for DELivered by HMLP. That figure is the total kWh you received from HMLP. Finally, the third line in that section reads REC which represents the total kWh RECeived by HMLP. This line shows how much excess kWh was produced by your solar array (you did not use) which you sold back to HMLP.
On your bill the number on the line that reads Energy Credit reflects how much “excess” electricity in kWh you sold back to HMLP and what we are going to pay you for said electricity in the form of a credit on your bill. The amount of your per kWh credit is tied to your solar system’s size. The per kWh excess electricity price HMLP will credit customers whose solar arrays have a design capacity greater than 20 kW (AC) will be the average per kWh cost of all of HMLP’s renewable power supply resources. The per
kWh excess electricity price HMLP will credit customers whose solar arrays have a design capacity equal to or less than 20kw (AC) will be the average per kWh cost of all of HMLP’s total power supply resources. Each year HMLP will calculate those costs, the average unit cost of HMLP’s renewable power supply resources and HMLP’s total power supply resources, and the per kWh credit price for the excess electricity solar customers sell to HMLP will be adjusted accordingly. Currently for solar systems whose design capacity is greater than 20kw (AC) the per kWh rate is $.0660. For solar systems whose design capacity is equal to or less than 20kw (AC) the per kWh rate is $.09491.
Capacity, Distribution & Transmission
The second line is what we must charge to cover our capacity, transmission and distribution costs (Cap., Dist. And Trans.).