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Shave the Peak

A New Way to Green the Grid


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About Shave the Peak

Shave the Peak empowers residential energy consumers to reduce energy demand on the most important days of the year. On peak days—usually the hottest or coldest days of the year—electricity demand soars, and the high electric demand is met by the most expensive, dirty fuels. Shave the Peak helps New Englanders take collective action to make an impact on our electric grid.

With Shave the Peak, you can receive text alerts on peak days, learn more about demand and the electrical grid, and support our advocacy efforts to clean up the New England power system.

What is peak electric demand?

Peak days, which occur on just a few days ever year, drastically impact the affordability and sustainability of the electric grid. So what’s going on?

To see what happens to the grid on a peak day, we can look at Friday, August 12th, 2016, which was the highest electric demand day of 2016 and one of the hottest days of the summer. On that day, temperatures soared above 95 degrees; across the region, New Englanders all cranked their air conditioners. As the afternoon wore on and people got home from work, they started cooking, turned on their TVs, or ran the laundry. Electric demand peaked at over 25,000 MW—almost twice the normal electric system load.

Graph: Fuel Mix on a Summer Peak Day (8/12/16)

To meet the extreme electric demand, the grid operator—ISO-New England—turned to “peaker plants,” the power generators of last resort. These power plants are generally the dirtiest and most expensive, running on gas and oil and selling their power at extremely high rates. Peaker plants are only necessary for the highest demand hours, about 2 – 7% of the year in full. In the graph above, you can see how the grid ramps up power from oil and gas peaker plants as electric demand grows.

As demand grows, price skyrockets. At the price peak on August 12, 2016, wholesale electric prices per MWh were over ten times the average for the year. Peak hours have such a big impact on our electricity costs that just 1% of the hours in the year account for 8% of the costs, and 10% account for 40%.

Peak Electric Hours

Peak days don’t just happen in the summer. Because most New Englanders use natural gas to heat their homes and buildings, on the coldest winter days, natural gas peaker plants don’t have enough gas to run. So, the grid turns to the dirtiest, most expensive fuel—oil—to meet the electricity demand. On the peak day last January, oil fuel provided the plurality of megawatt hours to the grid.

Fuel mix on a winter peak day

On a peak day demand can be twice as high, but prices can be TEN times as high.

Demand Price Comparison

Peak days are expensive and dirty—but we can help. We can usually predict when peak events will occur a few days in advance, so we can plan to reduce demand during the hours of highest electric use. Sign up for Shave the Peak alerts to receive peak event notifications and suggestions for how to cut down on electricity use.

Read our blog to learn more View our webinar slides

How does Shave the Peak work?

Consumer action is a better, cleaner, and cheaper way to meet electric demand on peak days.

  • Sign up for Shave the Peak alerts to receive notifications about peak events. We’ll let you know when a peak day is coming up and send you some suggestions for cutting down on electricity use during peak hours.
  • After signing up, you’ll be able to manage and change your alert preferences at any time.
  • Engage with us! Let us know how you’re shaving the peak by emailing us or tagging your efforts with #ShaveThePeak on social media.
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As we prepare for summer peak notifications and begin to explore ways to expand Shave the Peak, Mass Energy wants to hear from and communicate with you. Please take a minute to update your contact information and notification settings in our system, below.

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Ways to conserve

The easiest way to save energy during peak events is by turning down the heat or air conditioning. In the summer, turn the air conditioning down or off. Use fans whenever possible. During winter peaks, lower your thermostat a few degrees. You can also shave the peak by delaying your energy use. Wait until after 8 or 9pm to run the dishwasher, turn on the laundry machine, or cook in electric ovens.

Take a break from TV, computers, and other electronic devices for the afternoon—or charge portable devices beforehand and run them off of battery during the peak.

If you have an EV, make sure that you charge it before or after the peak, not during.

Many energy efficiency steps help conserve energy all year round! Learn more about energy efficiency here.

We welcome any comments, feedback, and suggestions!

Contact shavethepeak@massenergy.org