Calculator

Use the calculator below to compare your electricity supply costs (the cost of the actual electricity) to those of National Grid’s Basic Service costs, as well as to quantify the environmental benefits of participating in the Power Choice Greener and Power Choice Greenest options in Southborough Community Power Choice.

Please note: Your electricity delivery costs (the cost to bring electricity to your home or business) are determined by National Grid and will not be affected by your participation in Southborough Community Power Choice.

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

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

Southborough Community Power Choice Costs and Benefits

Price information Power Choice Standard (default)
minimum from renewable sources required by law
 Power Choice Greener (option)
50% from regional renewable sources
 Power Choice Greenest (option)
100% from regional renewable sources
Program price ($/kWh) $0.15883 $0.16572 $0.18572
Monthly electricity supply charges ($/month)
Your environmental impact after one year of participation in the program will be equivalent to:
Type of impact Power Choice Standard (default)
minimum from renewable sources required by law
 Power Choice Greener (option)
50% from regional renewable sources
 Power Choice Greenest (option)
100% from regional 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

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
12-month average National Grid price ($/kWh) $0.16279 $0.15031 $0.15539
Monthly electricity supply charges ($/month)

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

Price Information Residential Commercial Industrial
Current National Grid price ($/kWh) $0.17185 $0.15568 $0.21784
Monthly electricity supply charges ($/month)

Savings cannot be guaranteed

Please note that, while Southborough Community Power Choice seeks to provide a price that is equal to or lower than National Grid’s average Basic Service prices, there is no guarantee of savings compared with National Grid’s Basic Service prices because future National Grid prices are unknown.