Asia's richest man Gautam Adani on Wednesday said his ports-to-power conglomerate will build three giga factories for manufacturing solar modules, wind turbines, and hydrogen electrolyzers as part of a $70 billion investment in clean energy by 2030. Adani group is stepping up investments across the green energy value chain as it aims to become the world's top renewable energy producer by 2030. "The Adani Group has already committed $70 billion (for climate change and green energy). This will see us building three giga factories in India leading to one of the world's most integrated green-energy value chains," he said after receiving the USIBC Global Leadership Award here.