Electric Vehicle Charging

Are you are considering the purchase of an electric vehicle? Do you already own one?

You have multiple metering options to consider for charging your vehicle. As a first step, you should consider your family's lifestyle and needs for how quickly you need to charge your EV to help you determine the best option for charging. You may want or need the flexibility to charge your EV any time, day or night. Or you may want to charge your vehicle as quickly as possible. 

With Option 1 or Option 3 below, you can plug in your EV charger into an existing outlet and not be restricted on when you charge. The charging rate of speed would depend upon the size of the outlet.  Depending on your EV and for faster charging, a 240 Volt NEMA 14-50 outlet installed with a 50-amp circuit breaker may be preferred for the charger. This would provide the equivalent charging speed of a Type 2 charging station. 

If you want to charge only during off-peak hours, consider Option 2. This option does require installing a second meter which would be an expense to you, and this second meter would be on CMLP's Time of Use (TOU) Rate. This rate is beneficial if you are charging off-peak for at least 50-60% of your usage on that meter. 

By shifting your EV charging to off-peak hours, you can help reduce CMLP peak demand charges to help keep all customers’ bills lower. Peak demand charges refer to the extra cost for electricity during the times when there is the greatest call for electricity throughout the regional electric grid. During these times, in order to keep up with demand, additional – frequently dirtier and less efficient – power plants come online to add more electricity to the grid. There are extra costs involved in turning on and operating these ‘peaker’ plants, hence the extra cost of electricity during those peak times.

See below for more information about each of your options. For questions about EV charging, contact Customer Service at 978-318-3101 or concordlight@concordma.gov.

Option 1 — EV Charger on House Meter

Some EV chargers do not require a separate line and meter, so you can plug the charger into an existing outlet in your garage, which may normally be metered by your house meter. With this scenario, your EV's electric usage would be included with your house usage and would be on the same Residential Rate as your house meter. There is no financial advantage for you to charge the EV at a particular time of the day or week with this option. 

Option 2 — EV Charger on Second Meter (click here for meter socket wiring diagram)

Your electrician can give you an estimate to install a separate line for an additional meter socket which can cost between $500 to $2,000 or more. Working with CMLP's electrician, your electrician can advise you on the best placement of the meter socket. Your electrician can contact our electrician, Marty Boermeester, at 978-318-3141, with questions and to meet at your home before or during the job to discuss the work planned. 

CMLP would install the second electric meter (at no charge), and this meter would be on the Time Of Use (TOU) Rate. This rate allows for continued off-peak charging at a lower rate than the standard Residential Rate:

  • Off-peak charging
    • rate of $0.0987/kWh (includes Capacity, Transmission, and Distribution charges)
    • 10PM until 12PM noon (14 hours), Monday through Friday
    • all weekend hours
  • Peak charging
    • rate of $0.2146/kWh (includes Capacity, Transmission, and Distribution charges)
    • 12PM noon until 10PM, Monday through Friday

Please note that CMLP does not control the times of peak charging for your EV. You must program the off-peak charging times in your car and be aware of the difference between off-peak and peak pricing when charging your vehicle.There is no cost from CMLP to install that second meter, but this rate schedule must be taken for a minimum of one year.  

Once your electrician completes the work, the town wiring inspector does an inspection and contacts CMLP’s Metering Department to let us know the inspection is done. Next, our electrician inspects the work and installs the new meter for the charging station. 

If you have solar PV panels, your solar production can’t be used to offset your EV usage because CMLP’s net meter cannot discern where the electricity is coming from to charge your car.  As a result, you could be erroneously charged (rather than refunded) for the electricity your panels are producing.

Option 3 — EV Charger and House Meter on Time Of Use Rate

If you are interested in changing your current house meter to a TOU rate (which would require being mindful of all electric usage for all household electricity use – lights, computers, EV charging station, TVs, clothes washers, dishwashers, etc.), there would be a one-time $300 meter charge to switch the meter from the previous rate to the TOU rate.  As noted above, please be aware that the TOU rate schedule must be taken for a minimum of one year.