The Tokyo Metropolitan Government is setting up a ¥40 billion fund to promote the use of hydrogen energy and promote Japan's ecological technologies ahead of the 2020 Olympic Games.

The fund, according to the draft fiscal 2015 budget, is intended to cover the cost of building hydrogen stations, promoting fuel cell vehicles and providing fuel cells for business and industrial use.

Experts view hydrogen as a prime energy source because it does not emit carbon dioxide when burned and emits only water as a byproduct. It also contributes to energy security because hydrogen can be sourced from all over the world.