Japanese auto giant Toyota will start selling its first fuel cell sedan this financial year, with a price tag of around 7 million yen ($70,000), the company announced Wednesday.

The vehicles will begin rolling out by March in the home market, it said, and during the summer of 2015 it will make the environmentally friendly cars available in the United States and Europe.

"Hydrogen is a particularly promising alternative fuel since it can be produced using a wide variety of primary energy sources, including solar and wind power," the automaker said in a statement.

Fuel cell cars are seen as the Holy Grail of green cars as they are powered by a chemical reaction of hydrogen and oxygen, which produces nothing more harmful than water.

Toyota's fuel cell sedan can travel about 700 kilometres (435 miles) without refuelling, about three times further than an electric car, and it only takes three minutes refuel, similar to a gasoline engine car, Toyota said.

The company, while not abandoning electric altogether, sees the fuel cell as the next logical step after its big early success with the Prius gas-electric hybrid, which has sold about 3.7 million units since its launch in the late 1990s.

"Hydrogen does not emit CO2, so it could be a key player to realise a low-carbon society. It can be produced with fossil fuel such as natural gas and even with sludge accumulated in the sewage system," said Toyota vice president Mitsuhisa Kato.

"We believe hydrogen could become a very important source of energy in the future."

This is the first time Toyota has given a specific timeframe for its fuel cell cars, which it had previously said would go on the market in 2015.

The announcement came a day after Japan's industry ministry said the government will strongly support the hydrogen and fuel cell sector in a "strategic roadmap".

The ministry said the market related to hydrogen and fuel cell products and infrastructure is expected to expand from about one trillion yen in 2030 to about eight trillion yen within two decades.

While automakers expect eventual government subsidies to make fuel cell vehicles more accessible for general drivers, the price tag unveiled by Toyota on Wednesday is also a nice surprise for potential customers -- it had been widely expected that a fuel cell vehicle would cost around 10 million yen.

But many hurdles still need to be overcome before fuel cell vehicles become a common sight on roads, most notably, the network of hydrogen refuelling stations, Toyota said.

The Japanese government has also said it will try to make hydrogen available at a price similar to or less than gasoline fuel, while increasing the number of hydrogen refuelling stations to about 100 next year.

The company said it will initially start selling the model only in the regions "where hydrogen refuelling infrastructure is being developed".

The price ranges for a fuel cell unit for the US and European markets have not been decided, Toyota said.