NEW DELHI (REUTERS) - Under Prime Minister Narendra Modi, India has moved to quickly scale up its use of renewable power.

In 2014, the year Modi took office, India had 3 gigawatts of solar power. By the end of 2017, it had nearly 7 times that, or 20 GW, according to industry tracker Bridge to India, a renewable energy consultancy.

Now India wants to quintuple that total by 2022 - a goal once seen as hugely ambitious but now considered within reach by energy experts.

Progress is clearly happening quickly: During 2017 alone, India doubled its installed solar capacity from 10 GW to 20 GW.

"India is going to maintain and accelerate the momentum. It will move to be the number two player in the next year or two," said Tim Buckley, director of energy finance studies at the Australia-based Institute for Energy Economics and Financial Analysis (IEEFA), a think tank.

In 2017, India added the third largest amount of national solar capacity, just behind the US and China, and was overtaking Japan, according to IEEFA research.

Now, in partnership with France, India wants to take its growing resources and knowledge on solar power and use it to help other sunny countries jumpstart their solar ambitions as well.

SOLAR ALLIANCE

On Sunday, in New Delhi, Modi and the French President Emanuel Macron hosted the launch of a solar energy partnership that aims to build a network to help tropical countries around the world boost their use of solar power.

"In the Vedas (ancient Hindu texts), the sun was thought to be the world's soul. In India, the sun was thought of as the nurturer of all life," Modi said at the launch of the International Solar Alliance (ISA).

"These days, when we are looking for a way to combat climate change, we must look to this ancient perspective," he said.

As part of the alliance, India will offer up to US$1.4 billion (S$1.85 billion) in assistance to help with 27 solar projects in other countries, the prime minister said.

Upendra Tripathy, the director-general of the new alliance, said it aims scale-up solar power in many more countries.

"Everyone has access to (the sun) but in terms of ability to exploit solar energy, (that) is not equal," he said in a telephone interview with the Thomson Reuters Foundation.

"Credit is a challenge. Skillset is a challenge. The fundamental issue is, do all member countries have equal ability to exploit solar energy?" ISA plans to address that issue in part by creating a larger, global market for solar technology that would benefit smaller countries by aggregating the risk and the demand, Tripathy said.

The alliance, an effort to advance the 2015 Paris climate agreement, aims to become a network of 121 countries, he said. Currently 32 countries are full members and another 61 are on their way to full membership. Many are developing nations.

INDIA'S CHALLENGES

India's solar push is in part boosted by steadily dropping costs of providing solar energy.

To produce a unit of solar power now costs 2.5 rupees (five Singapore cents) - a cost similar to that of more traditional energy sources, said Kanika Chawla, the senior programme lead at the Delhi-based Council on Energy, Environment and Water, a partner organisation of the ISA.

India's transition to renewable energy - without shutting down its coal-fired power plants - represents a new model for developing countries going forward, Chawla said in a telephone interview.

But India still gets about three-quarters of its power from coal, although that is expected to fall to below 50 per cent by 2040, according to the International Energy Agency.

India's power providers, largely state-run public companies, are heavily in debt and as a result many companies generating solar power are not being paid on time, Chawla said.

India's government also is considering a 70 per cent tariff on solar imports to protect India's solar manufacturers - something that is causing a lot of uncertainty as investors try to bring new solar projects into the country, Buckley said.

Other issues for the nation's solar scale-up include the tricky business of figuring out how to integrate renewables into the existing electricity grid and the lack of a business model for such utilities - a problem other countries using solar energy also face, Chawla said.

All of these issues have contributed to a slowdown in the pace at which solar projects are being commissioned in India, she said.

But what the renewable energy future holds for the South Asian giant will be critical for the world, climate change experts say.

As China's economic growth slows, India's is heating up, along with its energy demand. India is today the top contributor to growth in energy demand, according to the International Energy Agency.

"It's worth acknowledging the Indian market and economy is still significantly smaller than China and it will be for some time to come," Buckley said.

However, "India is very much wedded to the energy transformation. It's coming straight from the Prime Minister, and the energy minister and the coal minister are very much onboard," he said.

And "especially with the US leaving the Paris agreement, there's a perceived void that some country needs to fill - and the International Solar Alliance is a clever way of signalling climate leadership", Chawla said. "It is India's offering to the world."