New Delhi, April 17 -- In a massive boost to India's green industrial ambitions, Rio Tinto and AMG Metals & Minerals are joining forces to set up the world's largest renewable-powered aluminium facility in the country, with a $6 billion price tag, said two people aware of the development.

An official announcement is expected today, where the two companies will unveil a joint agreement to explore setting up a large green aluminium project in India.

This development assumes significance in the backdrop of several developed economies planning to impose carbon tax on imports, including the European Union's Carbon Border Adjustment Mechanism (CBAM), bringing in stringent norms.

The plan includes building a 1 million tonne per annum (mtpa) a...