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Is solar the best option to reduce your Eversource CT electricity bill?

What makes CutMyBill better than other solar cost and savings calculators for Eversource CT customers?

There are three key reasons that our Eversource CT solar cost and bill savings calculator is far better than any other solar calculator or solar estimate website on the net for Eversource CT customers;

  • Firstly, whilst most solar panels calculators are really good at forecasting the electricity production you can get from installing solar panels for your home (because they all rely on the solar production data) most of them just use a single generic state wide unit cost for electricity in their calculations. Our Eversource CT solar cost and bill savings calculator actually uses our database of each of the available Eversource CT electric rates plans to use more specific electricity cost data. Therefore we can generate much more accurate solar savings analysis.
  • The second reason is that we use DOE (Department of Energy) electricity usage patterns for the Eversource CT service territory, and some very basic questions we ask you about your home to estimate how you use power over the course of a day and the seasons of the year. This allows us to accurately forecast solar savings where time of use electricity plans are available to you. We estimate your electricity usage for each hour of the year and then overlay the known production of solar panels in your area for each hour of the year. Without this level of detail solar panel cost and savings calculators on are inaccurate; and
  • Lastly, before we even consider solar savings, we look for any savings that can be achieved simply by swapping to a cheaper available Eversource CT rate plan. Our software looks for any available Eversource CT rates plan that works our cheaper for your estimated usage pattern. Generally speaking savings from swapping to a cheaper Eversource CT rates plan are only available to those who have larger monthly electric bills but given it only takes a phone call to achieve these savings it is by far the quickest and easiest bill cutting option where it is possible.
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Will installing a solar power system or swapping rate plans save me the most on my monthly Eversource CT payment?

There are almost always far greater cost savings to be obtained from installing solar panels than swapping rates plans but this doesn't mean possible savings from swapping rate plans should be ignored. The other reason we search for your cheapest rate plan is that to forecast total possible savings you could get on your bill you need to take into account both savings that may be available from swapping to the cheapest rate plan and also savings that come from swapping your generation source for some of your power usage to your own solar power.

Compare savings from swapping rate plans to solar savings


How accurate is the CutMyBill estimate of my power usage pattern?

The CutMyBill electricity usage profile estimator is a key part of the technology of why CutMyBill can forecast solar and bill swapping savings so accurately without requiring you to enter your kilowatt hour electricity usage for each month of the year or to upload 12 months worth of power bills.

The way we do this is we use electricity use profiles collected by the Department of Energy for each building type at each weather station across the Eversource CT service territory. Some of the characteristics of your home such as your average monthly power spend and the square footage of your home are used to refine this analysis.

This gives a fairly accurate estimate but it is not an exact estimate. The best way to get an exact estimate of your solar savings and whether or not there are possible savings from swapping rate plans is to speak to one of your local solar companies. Whilst solar companies are experts in solar they also become experts in knowing the cheapest rate plans (both before and after solar) from their local utility companies.

Estimate my power usage pattern over a day and over the seasons of the year


Three best ways to cut your Eversource CT electric bill

Did you know you can cut your home's energy bill by using flashlights instead of overhead lights? Did you know you can cut your energy bill by doing a home energy audit each hour?

Yes, those are silly questions. Fortunately, you don't need to sacrifice comfort to cut your energy bill by 20% or more. And it could be very easy to do.

This article is specific to the Connecticut utility Eversource. We hope it helps you make a solid game plan to cut your electric bill. If you haven't already, consider first reading our explanation of how your electric bill works.

Find out how much you could save. Get personalized results with the Cut My Bill calculator. It's Free and Easy!


Introducing the Patterson family

To illustrate ideas, we'll show numbers based on typical energy use for a single-family home in Hartford.

Meet our typical family from Hartford: the Patterson family. If you look closely at their picture, you'll see that the dad is also reading this article. The mom and daughter are saving energy by just pretending their tablets are on.

Family savings energy

Let's see how the Patterson family cut their monthly energy bill by 11% ($21).

Should we switch to the Time-of-Use rate plan?

You can voluntarily switch to CT Eversource's Time-of-Use (TOU) rate plan. How much money you save (or lose) on the Time-of-Use rate plan depends on when you use energy, and how your energy-use pattern matches up with the rate plan's time windows.

How much money you save (or lose) on the Time-of-Use rate plan depends on when you use energy, and how your energy-use pattern matches up with the rate plan's time windows.

If the utility charges the high-peak rates during the afternoon, the Time-of-Use rate plan isn't a good fit for those who work from an air-conditioned or electric-heated home. If the utility charges the high-peak rate during the evening, it's not a good fit for those who crank up the electric jacuzzi after work. You get the idea.

Why does CT Eversource offer a Time-of-Use rate plan?

We could compare the energy grid to the freeway — it can be smooth sailing or bumper-to-bumper depending on the time of day. It's easier and cheaper for CT Eversource to provide energy outside the 12pm to 8pm (rush hour traffic), so Time-of-Use rate plans signal CT Eversource customers to use more of their energy during other hours.

CT Eversource understands that some customers would respond to time-varying rates while some customers wouldn't — the Time-of-Use rate plan is optional for the more price sensitive among us (who take control and cut it).

What are the Time-of-Use rates and Windows?

Here are the details for this articles's featured CT Eversource Time-of-Use rate plan (named "7"):

Plan Name: Residential - Time of Day (7)
Last Update: January 1, 2018
Fixed Charge: Service Charge: $19.25
Rate per kWh
Off-Peak: $0.164
Peak: $0.199
Weekday Times
Off-Peak: Midnight to noon, 8pm to midnight
Peak: Noon to 8pm
Weekend Times
Off-Peak: All hours

How do we know if Time-of-Use is better for us?

Let's figure out whether the Patterson family would save money on the Time-of-Use rate plan. This starts with estimating how much of their energy they're likely to use during the expensive peak window (the more they use during peak, the higher their Time-of-Use bill).

CT Eversource now provides hour-by-hour historical energy data (commonly called Interval Data or Green Button Data). We'll use hourly data to make a better determination.


Interval Data
Green Button data


Interval or Green Button data is your electrical usage data for the last 12 months in one hour (or even shorter) intervals. This data is available from your utility provider.


Let's focus on summer weekdays (to keep this article under control).

Here's what their average hourly energy use would be under the Time-of-Use rate plan:

Place holder for average hourly energy usage.

The Patterson family uses more energy per hour during the expensive peak hours, but then again there are more off-peak hours in the 24-hour cycle.

It gets even more complicated, because the Time-of-Use windows are different in the winter and on weekends, and the Patterson family uses energy differently across the week and year.

Here's how the math works out: The Patterson family's average bill on their current rate plan (1) is $184. Their bill on the Time-of-Use plan (7) would be $182.

Is it worth switching rate plans to start saving $2.09 per month right away? Sure, why not. And as we'll see below, switching to Time-of-Use will put the Patterson family in a better position to save more money going forward.

Is it worth changing when we use energy?

Time-of-Use rate plans give you more control over your energy bill. You can save more money if you're willing to adjust how you use energy. For example, you could set an alarm for 3am to get up and run the dishwasher. Just kidding. Let's consider a reasonable way to adjust energy, and decide if it's worthwhile.

Recall that on the Time-of-Use rate plan (7), the summer weekday peak window (with the most expensive energy) is from 12pm to 8pm. The Patterson family runs the dishwasher and clothes washer/dryer around 6pm. At the peak rate of 19.9¢, the combined cost for cleanliness is $17.45 per month (not including water heating).

After reading this article, the Patterson family sets the washing machines to start at 8pm. The new charge is $14.38 per month — a $3.07 bill reduction. Is it worth it? It is for the Patterson family!

Hello, Smart Home

The idea behind a Smart Home is that your internet-connected home appliances can be partially or fully automated to reduce your electric bill while also increasing comfort. The dishwasher knows when the off-peak window starts and turns itself on then, the air conditioner learns your preferences and patterns to avoid over-cooling, etc.

While the Smart Home is clearly the future, it isn't quite the present — we're looking forward to Smart Home devices playing better together (in other words, better technical standards).

How do I switch our CT Eversource rate plan?

You should be able to switch your rate plan through your CT Eversource online account. If you don't see the option in your online account, go old school and give CT Eversource a call.

What about just using less energy?

We won't rally behind former President Jimmy Carter and tell you to put on a sweater and turn down the thermostat. We'd rather not see our breath in the living room. But it's probably worth taking 5 minutes to consider whether energy is wasted in your home (in other words, is energy used that doesn't improve well-being).

The Patterson family children have been politely asked to turn off lights when leaving rooms about 17 trillion times. They're generally respectful, but for whatever reason this one doesn't stick. How much money would the Patterson family save if the children always turned off their lights?

Three 30-watt lights get left on in empty rooms 2 hours per day on average. That's 5.5 kilowatt hours per month — which costs $1.06. Is it worth continuing the effort (or trying a smart-home solution)? Nope. The parents will let this one go for now.

What about energy efficiency?

There might be one or more basic energy-efficiency investments you can make that'd cut your electric bill while not reducing comfort or adding day-to-day complexity.

The Patterson family got a new refrigerator a decade ago, and plugged in their previous 1990s-era fridge in the garage (for those three sports drinks). Refrigerator efficiency has come a long way since the 1990s. In fact, their garage fridge uses over twice as much energy as their new Energy Star fridge. It'll cost them $16.68 per month to run it on their new Time-of-Use rate plan (or $16.87 per month on the standard rate plan).

Should they replace the old garage fridge with a basic $500 Energy Star fridge? They'd save $9.59 per month on their CT Eversource bill, but the related financing payment would be $9.44 per month ($500 borrowed, 5-year term, 5% interest). Their net benefit in the first month would be 15.6¢. With the financing cost, the new fridge would pay for itself in 4.9 years (followed by years or decades of pure bill savings).

The Patterson family decided they don't actually need a second fridge. That's a $9.59 per month bill reduction!

The Patterson family's game plan so far

The Patterson family has felt the pain of high electric bills for years. Thanks to this article (we have no shame), they're now ready to take control and cut it. Sounds like fun!

Their current average monthly bill is $184. Here's their game plan:

1. Switch rate plans: Switch to the Time-of-Use rate plan ("7")
When: Right after reading this article and making their game plan
Bill reduction: $2.09
New monthly bill: $182
2. Adjust energy use: Run the dishwasher and laundry machines during off-peak hours
When: Once they switch rate plans.
Bill reduction: $3.07
New monthly bill: $179
2. Reduce energy waste: Unplug the garage fridge (and schedule a recycling-center pick up time)
When: This week
Bill reduction: $9.59
New monthly bill: $170

One week later...the Patterson family's new monthly bill is $170. They cut their bill by 8%!

They're excited, and in their enthusiasm they're wondering if they can cut their bill even more. That's when little Suzy got a bright idea. "Hey Mom and Dad, what about solar energy?".

Yeah Suzy, What about solar energy?

"'s probably too expensive." The Patterson family wanted to at least consider it, so they got in touch with a few local solar installation companies through They were happy to hear that solar energy isvery affordable — it's only half the cost it was just 8 years ago.

They learned that 16 solar panels would fit nicely on the sunniest part of their roof (at 215 watts per panel, that's a 3.4 kW system). That'd bring their net monthly energy use from 939 kWh down to 549 kWh. And it'd bring their monthly CT Eversource energy bill from $170 down to only $107.

They also learned they could finance the solar system through a solar-loan provider — and their bill savings would be higher than the financing cost. In other words, there'd be no down payment and they'd start saving money immediately. Their $107 electric bill plus a $56 monthly financing payment would put them at a $163 per month energy cost. So their solar energy system would cut their monthly energy cost by 4%, or $6.38. And their savings would increase over time, because electric rates go up while the financing payment doesn't.

The Patterson family totally went solar.

Patterson family conclusion

If they took no action, the Patterson family would be paying $184 per month for energy. The rate plan switch and energy adjustments got their bill down to $170. With solar energy and the solar financing payment, the Patterson family's new net energy cost is $163. All together, they cut their monthly energy cost by 11%, or $21. The Patterson family is feeling good! Here they are monitoring their real-time solar production and utility energy use.

Family monitoring energy usage

Energy bill reductions = tax-free income

That $21 of extra cash is actually worth $30. What? The Patterson family has to pay income tax on money used for personal expenses (including their electric bill). Since they no longer need to pay $9.06 in taxes on the $21 they're not giving CT Eversource, the net electric-bill reduction is worth an extra $9.06. The big take home here is that, dollar for dollar, electric bill savings is more valuable than a conventional investment's return.

Your game plan

We hope this article convinced you that you can have your cake and eat it too — you can save money, improve your family's well-being, and help out the planet. We wish you the best with your upcoming power moves.

Find more about Eversource Energy Connecticut electric rate plans.