A Bangalore-based company is planning to build the world's largest factory for low-cost, purely electric cars in a bid to introduce green energy to the subcontinent's rapidly growing automotive industry.

Reva Electric Car Company, whose small hatchbacks are driven by eight six-volt batteries, is investing Rs300m ($6.1m) in a plant that will have annual capacity of up to 30,000 units after it begins production in the first quarter of next year.