Polyester yarn manufacturer Filatex India NSE 2.50 per cent plans to invest around Rs. 400 cr in expanding the capacity of its plants in Dadra and Dahej, besides setting up a captive power plant to reduce the company’s energy costs. The Delhi-based company has earmarked Rs. 275 cr to augment the yarn manufacturing and polymerisation capacity of its plants from 3.28 lakh MT per annum to 3.65 lakh MT by next year.