Using Water Heaters to Store Excess Wind Energy

Keywords: energy management, energy storage, smart grid, wind energy, renewable energy

Wind PowerThe Bonneville Power Administration (BPA) is recruiting one hundred homeowners in Washington for an experiment on how to store surplus wind energy. The BPA is testing a promising smart-grid concept that would use residential water heaters to help manage the fluctuations of wind energy generation.

The project will address two problems experienced on the grid: shortage of power during peak times and surges of power during windy periods, when the energy isn’t needed.

The BPA, working with Mason County Public Utility District Number 3, will install special devices on water heaters that will communicate with the electrical grid and tell the water heaters to turn on or off, based on grid conditions and the amount of renewable energy that’s available.

Electric water heaterWhile homeowners will be able to override the control device at any time, it’s unlikely that they would even notice a change in temperature.

The water heaters in effect become energy storage devices — turning on to absorb excess power and shutting down when demand ramps up —leveling out the peaks and valleys of energy use. Benefits include:

  • no need for expensive and toxic battery storage
  • no need for fossil fuel burning power plants to fill in low wind energy gaps
  • water heaters provide distributed storage, avoiding point loads on grid
  • smart water heaters can be manufactured economically, for just a few dollars more.

Wind power is the fastest growing source of renewable energy, accounting for about 3 percent of US electric generation. About 53 million homes in the United States, or 42 percent of the total, use electric hot water heaters. Added up, they account for 13 percent to 17 percent of nationwide residential electricity use.

In the Pacific Northwest, home of the BPA, it’s estimated that there are 4.3 million water heaters that can store 2,600 megawatt-hours by allowing the storage temperature to vary by five degrees. (NB: For a detailed analysis see the Northwest Power and Conservation Council report prepared by Ken Corum.)

The Northwest Energy Coalition does a nice job detailing the background, and benefits of this approach to storing excess wind energy. Highlights of their articleUsing simple smart water heaters to integrate intermittent renewables, are below.

Highlights of Using simple smart water heaters to integrate intermittent renewables


Wind-generated power is clean, relatively cheap and available in large quantities. But the wind itself is quite unpredictable, so much so that for each average megawatt (aMW) of wind power we need, we must erect about 3 megawatts of turbine capacity, since actual output could be anywhere from 0 to 3 megawatts at any instant.

Suppose our region, which consumes about 21,000 average MW of electricity each year, wants to get a third of its power from wind.  We’d have to build about 21,000 megawatts (MW) of turbine capacity to get 7,000 average MW of electricity.  Given weather variability and the geographical spacing of wind projects, over time the actual production of those 21,000 megawatts of turbines will vary from about 1,000 MW to 15,000 MW due to weather fronts and daily warming patterns. Problematic 3,000- to 4,000-megawatt swings can occur in as little as 10-30 minutes.

To deal with large variations in wind, grid operators use some expensive tools now at their disposal, generally limited to ramping natural gas-fired combustion turbines and/or hydro generation up and down. Ramping up is fairly easy; today’s grid has ample reserve capacity on which to draw.

Ramping down is another matter. When wind generation suddenly spikes during periods of low demand (at night or during mild weather hours), the system can have less flexible generation on-line (nuclear and coal plants) that cannot be cut back to make room for the wind. The region’s inflexible “baseload” coal plants and one nuclear plant, which together provide more than a quarter of our electricity, cannot be economically ramped up and down in response to wind variability.

Previous Transformers and NW Energy Coalition’s Bright Future report have addressed wind-integration issues, noting – in particular – that the problems will lessen as we progressively eliminate coal-fueled power from the Northwest grid, as renewable projects grow and become more diverse and geographical dispersed, and as “smart grid” deployment provides a new back-up resource.

Smart grid to the rescue

In a Feb. 10, 2009, presentation to the Northwest Power and Conservation Council, Council staff member Ken Corum provided a powerful example of how one relatively simple smart grid innovation – using electric water heaters as temporary storage devices — could help the grid integrate large amounts of wind power at very low cost. We expand on Corum’s example below.

The Northwest power system serves about 4.3 million electric water heaters. If all were running at once, their loads would total more than 19,000 MW. Of course, they don’t all run at the same time.  Actual demand might be just a few hundred megawatts in the middle of the night, surging to more than 5,000 MW around 8 a.m. when people take their showers. Use drops during the day, and then peaks again at about 3,500 MW around 8 p.m. as people come home and wash dishes, clothes, etc.

Now imagine that as part of the smart grid, each water heater contains a chip that can receive signals from grid operators to raise or lower the water temperature by a few degrees. As wind generation picks up, the grid operator slightly raises the temperature set points on millions of water heater thermostats, thus “storing” the wind power for later use. Should the wind suddenly drop, the operator lowers the temperature points, causing many water heater elements to click off for a time.

Most people won’t even notice the small temperature changes. But spread over millions of water heaters, those few degrees of difference are enough to avoid ramping fossil-fuel and hydro generation up and down, thus improving system-wide fuel efficiency and leaving more water in the river for migrating salmon.

Once the infrastructure — smart meters that can communicate with both the utility and home appliances — is in place, manufacturers could start installing computer chips, adding perhaps $5-10 to the cost of a water heater, Given the system savings the water heater controls would generate, utilities could afford to cover the additional cost, and/or offer customers a rate discount or other incentive in exchange for limited control of their water heaters.

Currently, for example, Idaho Power pays residential customers $7 per month to participate in its A/C Cool Credit Program, which slightly backs down air conditioning power during peak demand periods.

Water heaters are a great choice for smart grid applications because of their relatively short life spans. Over about 12 years, the current stock could be totally replaced with smart water heaters.

Shifting peaks – and keeping the lights on

Aside from facilitating the integration of thousands of megawatts of wind power, controllable water heaters (and other appliances and equipment that draw electricity 24/7) provide two other benefits:

1. Reliability. Major power lines and generating plants occasionally suffer sudden outages due to fires, ice, wind or equipment failure.  Turning down a few million water heaters could quickly shave demand enough to cover the power loss and avoid a major blackout.  In fact, the chips discussed above can be made to automatically and instantaneously detect frequency changes in the electricity they use without any operator intervention. The chip reacts to a sudden change from the standard 60 cycles per second by instantly turning the heater on or off to keep the grid stable.

2. Money. Utilities spend a lot of money following the daily peaks and valleys of human activity.  Thirty to 40% of their generation capacity sits idle for much of each 24-hour day.  Another 5-10% come on only during very extreme weather — the hottest or coldest days.  But utilities must cover the capital and maintenance costs of all these resources, no matter how little used.

Controllable water heaters would rarely go on during system peaks and could help utilities respond to system emergencies … at huge cost savings. Utilities would be able to spread demand more evenly throughout the day, increasing power line and substation efficiency and avoiding the costs of some mostly idle generation resources. These actions could lower bills substantially and/or provide savings to fund additional smart grid investment.

And that’s just one example

Though this article has focused on electric water heaters, similar controls can be installed in freezers, air conditioners and electric furnaces.  Electric and hybrid-electric vehicles are other examples. Their charging rates can be altered while the vehicles are plugged into the grid. The opportunities are only starting to reveal themselves.

Allowing grid operators access to our appliance controls raises issues of cybersecurity, privacy and the potential for short-circuiting due process (e.g., automatic shutoff for non-payment of bills). Those issues must be adequately addressed. But the smart grid can help move the Northwest quickly and affordably to a bright energy future.

0 thoughts on “Using Water Heaters to Store Excess Wind Energy

  • > … adding perhaps $5-10 to the cost of a water heater

    Good luck with that, BPA. Residential water heaters currently electro-mechanical controls. Just the conversion to digital will command a premium at least an order of magnitude higher, otherwise the industry would have already done so. Commodity pricing only comes with huge volume. As much as I hate federal mandates, that’s the only way you’ll ever see controllable water heaters priced anywhere close to current builder price points.

    BTW, nice photo of a gas water heater. A lot of good that’s going to do!

  • Thanks David.

    Actually, I had the local utility modify my electric water heater, and they did it at no charge, and reduced my monthly bill by about $9. The circuit they put in had a radio receiver, solid state switch and utility box – no Federal mandate. That said, whatever governments want to do to incentivize transitions to renewable energy are worth taking a look at.

    As energy becomes more precious, utilities are shifting the mindset of selling energy to conserving energy.

  • Hi Jay, electric utilities have had direct load control for more than 30 years. But just consider how much it costs the utility to roll a truck, install the switch and deploy the communications network. So there’s a strong incentive (from the utility industry’s perspective) to have a microprocessor interface and internet connection on the water heater out of the box.

    The problem is that the direct load control market is currently infinitesimally small so white goods manufacturers have zero incentive to offer such features (chicken or egg problem). There are a handful of water heaters with digital thermostats but they are positioned as top-of-the-line with prices to match.

    When someone says a control chip would only cost $5 to $10, they’re talking manufacturer cost. If all water heaters were required to have such a feature, then the market would eventually settle back to commodity pricing, perhaps in the $25 ballpark at retail. And you’d still have to deal with router connections and the associated technical challenges. Without a government mandate, the marketing folks will turn that feature into a $100 differential at retail.

  • I was just at an OPALCO meeting last week, and they announced they will be part of this program. Residents with electric water heaters, who are on the OPALCO grid can sign up to be part of the program.

  • what I don’t understand is how the heater stores the electricity? If the water heater temp is bumped up then the water gets hotter. But when you cycle the heater off it will cool as well. How does it put the wind energy back into the grid when their is a shorfall?

  • Water heaters store energy in the form of heat, not electricity. By heating the water during peak wind/solar periods, and then delivering it back to the homeowner or facility, as needed, during slack wind/solar periods, the electricity that would normally be needed during the slack times is avoided. Which helps the utility save on need for building or firing up fossil fuel based generation.

    The linked report and article in the post above are worth reading and give a very detailed explanation for how the process works.

    And I want to emphasize, as with any energy transition, we are in the early days of transitioning to renewables. As we saw going from wood to coal, to oil, etc. the early days are just the beginning, and as the new paradigm matures, innovations abound to address challenges, increase efficiency, and generally minimize what is not desired and maximize what is.

  • This is a boondoggle answer to a boondoggle problem. Wind energy generation will never meet the needs of the growing US population. Always remember the “golden rule of unintended consequences” when you deal with gov’t mandates.

  • Hi Mr. Barret,

    Which government mandates are you referring to? Which answer are you referring to? Are there particular “unintended consequences” you are concerned about?

    Regarding US population growth, in the past decade – The US population grew at its slowest rate since the Great Depression. And the population is finding ways to conserve, so per capita energy consumption is flat to down. See:,_energy__consumption_per_capita.jpg

    Renewable energy, especially wind power, is the fastest growing sector in energy. Nations and states are looking for ways to avoid building CO2 emitting toxic coal plants. There is a good chart showing sources of energy in the US. See:

    The energy needs of our population will be met by a variety of solutions. As in the past, no single resource will do it all. That said, wind power will be a major contributor. For more on the Department of Energy projections on power needs and solutions, see:

    Worth noting – on page 5, figure ES-2 – the rapid growth of wind power is pretty stunning, starting in 1999. Production tax credits and renewable portfolio standards helped kick the transition into gear.

    Creating incentives to transition to less toxic, more beneficial energy sources is a tried and true technique. Taxing what we want to discourage, incentivizing – through credits and such – what we want to encourage, works. Cigarette taxes, fuel taxes, etc.

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