Ice Batteries: Storing Cold Instead of Electricity? Here’s How It Works

–Surya Prakash Josyula

When summer arrives, we use our ACs for longer hours. The situation is even more demanding in offices, malls, hotels and large buildings. As the temperature rises, the need for cooling also increases. This means electricity consumption can go up sharply.

Now, New York in the US is using an interesting solution to deal with this problem. Instead of storing electricity in a battery, they are storing cooling in the form of ice! This system is called an ‘Ice Battery’.

How does it work?

Let’s understand it in a simple way. Imagine putting a bottle of water in your home freezer to make it cold. The idea is similar, but on a much larger scale. Large buildings have big tanks that can hold a huge amount of water.

At night, when electricity demand is lower, the system uses electricity to freeze the water and turn it into ice. In simple words, cheap electricity at night is used to create and store cooling for the next day.

The real benefit comes during the daytime.

How is the ice used to cool the building?

During the afternoon, temperatures rise and the demand for AC increases. This is when the ice stored during the night becomes useful.

The stored ice is used to cool water. This chilled water is then circulated through the building’s cooling system.

Because the water is already cold, the AC system does not have to work as hard to keep the building cool. That means less electricity is needed during the hottest part of the day.

This is the basic idea behind an Ice Battery.

What is the benefit?

Electricity demand is usually highest during the daytime, especially when large numbers of people are using ACs, coolers and other appliances at the same time. This puts extra pressure on the power grid.

An Ice Battery helps reduce that pressure.

Instead of using a lot of electricity during peak hours, the system uses electricity at night to make ice and then uses that stored cooling during the day.

This can help building owners reduce cooling costs and, at the same time, reduce the pressure on the city’s electricity system.

Can we use it in our homes too?

An Ice Battery is not a small device that you can simply keep next to your refrigerator. It is more useful for large buildings such as offices, malls, hotels, hospitals and data centers, where cooling is needed for long hours.

But the basic idea is very simple:

Use electricity when it is cheaper to make cooling. Store that cooling as ice. Use it when electricity demand is high.

So, just like a normal battery stores electricity for later use, an Ice Battery stores cooling in the form of ice and uses it when needed.

As the demand for ACs continues to rise during hot summers, this technology could become a smart way for large buildings to stay cool while managing their electricity use more efficiently.