The energy from the sun is then captured into these strong chemical bonds. What’s surprising is that this energy remains strong even after the liquid cools down to room temperature in the liquid’s peak capacity, it is capable of storing up to 250 watt-hours of energy per one kilogram -- nearly twice of what Tesla Powerwall batteries can do

However, today, solar energy is engulfed with a couple of challenges -- the first is that it's only available during the day and the second is that of the storage of this energy for long-term use.

However, a team of scientists from Sweden might have found a solution for the second challenge. They’ve developed “solar thermal fuel” -- a special kind of fuel that is capable of storing the sun's energy for up to 18 years. It has been in development for over a year by researchers from the Chalmers University of Technology in Sweden.

The device that helps in capturing solar energy is called MOST which stands for Molecular Solar Thermal Energy Storage System. It works in a circular manner where a pump cycles the fuel through transparent tubes.As they come in contact with the sunlight, the bonds between the atoms are rearranged turning to an energy-rich isomer. The energy from the sun is then captured into these strong chemical bonds. What’s surprising is that this energy remains strong even after the liquid cools down to room temperature.

The device that helps in capturing solar energy is called MOST which stands for Molecular Solar Thermal Energy Storage System. It works in a circular manner where a pump cycles the fuel through transparent tubes.As they come in contact with the sunlight, the bonds between the atoms are rearranged turning to an energy-rich isomer. The energy from the sun is then captured into these strong chemical bonds. What’s surprising is that this energy remains strong even after the liquid cools down to room temperature.

To use this trapped energy, the liquid is flown through a catalyst developed by the research team that creates a reaction warming the liquid by 63 degrees celsius. This kickstarts the process, with the molecule back to its original form and releases the energy in the form of heat.

This heat can be used to either heat a building’s water heater, dishwasher, and other applications where warm water is needed. It can also be used for industrial applications such as sterilisation, distillation and low-temperature heat used for cooking, among other applications.

The same liquid can be pumped back into MOST and reused where it would collect and store solar energy again. Researchers have reused the same fluid over 125 times and haven’t seen significant damage to its molecular structure.

According to the leader of the research team, Kasper Moth-Poulsen, Professor at the Department of Chemistry and Chemical Engineering, in the liquid’s peak capacity, it is capable of storing up to 250 watt-hours of energy per one kilogram -- nearly twice of what Tesla Powerwall batteries can do.

For now, researchers from Chalmers are working on developing prototypes of the tech for its large-scale operations. They've received a grant of 4.3 million Euros from the European Union that is expected to last for three years.

Moth-Poulsen said in a statement, “With this funding, the development we can now do in the MOST project may lead to new solar-driven and emissions-free solutions for heating in residential and industrial applications. This project is heading into a very important and exciting stage."