Calculate how much you can save on your National MA bill with solar panels

Average 25 year solar savings for a National MA customer: $83,911

Average solar panel cost: $14,063 - $17,188*

Estimate solar panel cost and savings based on your location, roof and power use.

*Solar panel cost varies by location, solar panel mqanufacturer, system size and the amount of electricity your home uses.

Adding solar panels and switching rate plans can lower your National Grid Massachusetts electric bill

Updated: October 22, 2020

There are three ways you can reduce your National MA bill: changing your habits, switching your rate plan, and adding solar panels.

You've probably heard a lot about reducing energy consumption by doing things like switching to LED lightbulbs and adding insulation to your walls, but these fixes are relatively easy compared to the far more impactful step of making changes to your lifestyle.

The second thing you can do is switch your rate plan. National MA doesn't offer time-of-use billing that can help you save money by shifting your usage of energy-intensive appliances to off-peak hours, but there may be other options for you .

Finally, you can reduce or even eliminate your electricity bill by installing solar panels on your home.

Solar panel cost calculator

How much can I reduce my National Grid Massachusetts bill by switching to a different rate plan

For some people, the savings from switching rate plans may only be a few dollars per month, but for many it can be $20-$100 per month. That's between $240 and $1,200 that you may now be paying to National Grid Massachusetts each year for no reason.

Finding out what's available to you is as simple as a phone call or email to National Grid Massachusetts. Even a small savings can be worth it.

Are solar panels worth it for National Grid Massachusetts customers?

Absolutely, yes! With the state’s 15% solar tax credit, generous SMART solar incentive program, (including an available low income solar plan), and sales and property tax exemptions, solar panels make a lot of sense for National Grid customers in Massachusetts. National’s net metering policy also ensures you get credited on your power bill at full retail rates for the excess solar electricity your panels produce. Your credits are rolled over and applied to your next month’s bill.

Does National Grid Massachusetts offer full 1 for 1 net metering credits for exported solar power

Yes, National Grid Massachusetts offers 1 for 1 net metering. This means you are paid the same rate for excess solar energy that you export to the utility grid during the middle of the day as what you pay for power purchased from the grid.

In the case of National Grid Massachusetts, this is approximately $0.23 per kWh.

What incentives, tax credits and rebates are available to National MA customers for installing solar?

The major financial incentive currently available until the end of 2020 is the 26% federal solar tax credit. The way this works is that the full cost of the system needs to be paid to the installer, and this tax credit can then be claimed back as cash when you next do your taxes.

Many states, local governments and utilities also offer incentives for homeowners who go solar. This help can take the form of state tax credits, rebates, tax breaks, SRECs or even performance-based incentives. The best part is that all of these incentives apply in addition to the federal credit.

Here is every incentive you may be eligible for as a National MA customer:

Table 1: Incentives
Upfront Incentives Value*
Residential Renewable Energy Tax Credit (Federal) -$5,230
Solar Massachusetts Renewable Target (SMART) Program (State)

*The per kWh incentive rate for this calculation was pulled from the Eversource East number for Block 4, which is the largest remaining block by MW (i.e. affects the largest number of people)* The SMART program is a descending block incentive program that requires utilities to play a flat, per kWh rate that remains the same for 10 years. Renewable energy credits generated on the SMART program are retained by the utility.

Renewable Energy Equipment Sales Tax Exemption (State)

State law exempts equipment directing relating to any solar which is being utilized as primary or auxiliary power system for the purpose of supplying energy from state sales tax

Transitional SRECII program (expired) (State) Varies
Renewable Energy Property Tax Exemption (State)

Cost of system exempt from property taxes for 20 years.

Residential Renewable Energy Income Tax Credit (State) -$1,000
TOTAL -$6,230

*Based on 7.32 kW system, average installation cost $21,115

How much does installing solar panels save the average National Grid Massachusetts residential customer?

If you input the details for a National MA customer with a power bill of $210 per month into the best online solar panels calculator, it tells you that you need a 7.32 kW solar system that will produce 9,151 kWh per year and that this system will return the owner a $83,911 profit after repaying the cost of the system.

The solar savings possible for you as a National MA customer will depend on the amount of electricity you use and the cost of the solar system you buy. Savings also vary based on the direction of your roof or any shading of your roof that affects output.

Here is a monthly and lifetime solar savings estimate for the same relatively typical National MA customer with a $210 per month electric bill prior to solar and who installs a 7.32 kW solar system.

How much do residential solar panels cost for National MA customers?

Showing data for:

Prices based on a 7.7kW system, after 26% federal tax credit

Solar prices near you

Cost range of local prices


Net profit (savings less system cost)


Payback period

3.3-4 years

Recommended size for the selected utility bill


Solar panel cost calculator

Detailed information about your estimate

Table 2: Estimate details

System Size (for 100% usage offset)

7.32 kW

Annual Power Generation

9,151 kWh

Pay-back time (assuming Cash purchase)

3.5 Years

Internal Rate of Return (IRR) on Investment


Gross cost


Total Upfront Incentives and Rebates


Net Cost of System after rebates and incentives


Total Cost of Utility Power Avoided over 25 years


Please note that the investment return figures do not include the possible increase in property value.

What are the environmental impacts of National Grid Massachusetts customers installing solar panels?

While most homeowners decide to install solar panels because of financial savings over time, the environmental impacts of this choice are the primary motive for others. Here is a breakdown of the environmental benefits from a National Grid Massachusetts customer installing a 7.32 kW solar system on their property:

A solar system generating 9,151 kWh per year will save you money AND make the world a nicer place

Saves you


on average per year

Reduces CO2 emissions


tons per year

Equivalent to planting

32 trees

per year

Equivalent to driving

10,021 mi

less per year

CO2 emissions calculation based on the electricity generation and emissions data for your state in 2015 as published by the US Government Energy Information Administration.

What factors affect the price of solar panels for National Grid Massachusetts customers?

The cost of installing solar panels will vary with brands of solar panels and inverters you choose and also the installation company you choose to install them.

It is common to see really good systems, using quality brands of equipment, being sold for around $2.88 per watt or $14,625 for a standard 7.32 kW solar system after the customer claims the 26% federal solar tax credit.

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