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Supermarkets Could Be the Backbone of Smart Cities




What cools your products at your local supermarket can heat your home at the same time – let’s do more with less. The key to this are connected buildings.

Most of us still go to the supermarket every week, but as we are walking down the aisle of freezers, do we ever stop to think about how much energy is used to cool our products? Most people would be astonished to learn supermarkets currently use around three per cent of global electricity, but would you believe that your local supermarket could actually be your provider of heat or power?

We have thousands of supermarkets in our cities — in New York alone, where theBloomberg Future of Energy summit takes place this week, there are over 1500. Keeping food cold or frozen across all these sites requires a lot of energy. As you will know if you have ever felt around the back of your fridge, all this cooling produces significant amounts of heat. The ability for us to recover and use this heat is a huge untapped potential.

Twenty Danish supermarkets already send their surplus heat into the local district heating networks. The local supermarket close to the Danfoss’ headquarters in the south of Denmark now saves more than 31,000 USD annually on gas for heating. CO2 emissions are reduced by 34 per cent by using the surplus heat from the refrigeration system to heat the supermarket and neighboring buildings.

The potential is bigger. Modern cooling equipment can respond to changing demands, helping reduce peak loads. In Germany, where three percent of all electricity is used for cooling purposes in supermarkets, the potential of adding the flexibility of supermarkets to the smart grid would equal up to 30 percent of the total electricity produced by wind across the whole European Union.

By connecting with external networks, such as district heating, supermarkets can also store renewable energy. We estimate by including the storage capacity of today’s unused cooling compressors we could add 100 percent to our ability to store energy in the event of overproduction of wind electricity.

The business case for connecting supermarkets with electricity and heating networks is based on the energy and CO2 savings it will produce and the very short payback times of around one and a half years for the supermarket owner. This makes sense from an economic and environmental standpoint. The question is, how can we accelerate the implementation of such innovative solutions? We need to start talking together, across industries.

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