Calculator

Use the calculator below to compare your electricity supply costs (the cost of the actual electricity) to National Grid’s Basic Service costs and to quantify the greenhouse gas benefits of participating in Grafton Energy Choice.

Please note: Your electricity delivery costs (the cost to bring electricity to your home or business) will not be impacted by your participation in Grafton Energy Choice.

To use the calculator, find your monthly electricity use (in kWh) on your National Grid electric bill and enter it into the box below.

Your monthly electricity use: (Enter the number of kWh you use in any given month)

Grafton Energy Choice Costs and Benefits

Price information	Energy Choice Basic Meets minimum renewable energy requirements	Energy Choice Green 100% from renewable sources
Program price ($/kWh)	$0.16984	$0.19682	$0.00000
Monthly electricity supply charges ($/month)

Your environmental impact after one year of participation in the program will be equivalent to:

Type of impact	Energy Choice Basic Meets minimum renewable energy requirements	Energy Choice Green 100% from renewable sources
Avoid the equivalent of this many pounds of CO₂ after one year of participation
Avoid the equivalent of driving this many fewer miles after one year of participation*

* This equivalency is calculated using information provided by the EPA’s Greenhouse Gas Equivalencies Calculator. Greenhouse gas emissions avoided are calculating using the most recently available NEPOOL GIS emissions factor.

Compare to National Grid's Basic Service price

National Grid’s most recent 12-month average prices: While the program offers a long-term fixed price, National Grid’s Basic Service prices change every 6 months or less. As a result, comparing the program price with the most recent 12-month average of National Grid’s prices can provide a more accurate comparison than comparing with only National Grid’s current price.

Price Information	Residential	Commercial	Industrial (WCMA)	Industrial (SEMA)
12-month average National Grid price ($/kWh)	$0.16279	$0.15031	$0.14375	$0.14635
Monthly electricity supply charges ($/month)

National Grid’s current prices:
Residential and commercial prices are in effect August 1, 2026 – January 31, 2027.
Industrial prices are in effect August 1, 2026 – October 31, 2026.

Price Information	Residential	Commercial	Industrial (WCMA)	Industrial (SEMA)
Current National Grid price ($/kWh)	$0.17185	$0.15568	$0.10852	$0.11024
Monthly electricity supply charges ($/month)

Savings cannot be guaranteed

Please note that, while Grafton Energy Choice offers the potential for savings when compared with National Grid’s Basic Service price, there is no guarantee of savings. This is because National Grid’s prices change every 6 months for residential and commercial customers and every 3 months for industrial customers, and future National Grid prices are unknown.