Mumbai - Standing up for an environment-friendly cause, serious actor Ajay Devgn has invested a good amount of money for the making of a solar park in Gujarat. The star also wants to introduce solar powered generators in the film industry to save power. The state-of-the-art solar park, which is situated at Charanaka in Patan District, became operational in December last year. "The thought behind our entry is that we believe that solar power is the future of industry. We are aiming to reach 500 mw within three-five years with a total investment of Rs 5,000 crore" the actor said in a statement.