In an apparent and strategic move towards renewable energy, India's Reliance oil-to-telecoms giant is coming out of a $15 billion deal for Saudi Aramco to buy a 20% stake in its oil refining and chemicals unit, the company has said in a statement.

Reliance referred to "evolving" portfolio of businesses and has said the two firms had "mutually determined that it would be beneficial for both parties to re-evaluate the proposed investment".

It added that a legal application that would have paved the way for Saudi Aramco to take the stake in its oil-to-chemicals division would be withdrawn.

The deal was announced more than two years ago by Reliance chairman Mukesh Ambani, Asia's richest man, and touted as the biggest foreign investment in the conglomerate's history.

However, Reliance and other major Indian firms have since poured billions of dollars into green power as the government pushes to reduce its dependence on imported fossil fuels and as the country's cities are assailed by pollution.

Saudi Aramco is the world's biggest oil-producing company and vies with Apple for the title of the most valuable firm on the planet.

Ambani in June this year pledged to invest $10 billion in renewable energy over the next three years.

The unit includes Reliance's refining, petrochemicals and fuels marketing businesses, among them the giant Jamnagar refinery in Gujarat.

Reliance recently announced it would build four "giga factories" at Jamnagar making solar panels, storage batteries, and hydrogen-related products to create one of the largest integrated renewable energy manufacturing facilities in the world.

The Mumbai-headquartered firm's rise was powered by its oil and petrochemicals businesses but in recent years it has diversified into areas ranging from telecoms to retail.