To launch four power projects, Indian government-owned Power Grid Corporation is to invest Rs 2,820.04 crore. The power transmission major would invest Rs 1,364.52 crore in 'Eastern Region Strengthening Scheme-V' project, with commissioning expected in 30 months, the company said in a regulatory filing on October 30.    Power Grid Corporation would pump in Rs 1,315.90 crore in "Inter-Regional System Strengthening Scheme in WR and NR (Part A)" project, which is anticipated to be completed in 36 months. As per the filing, Power Grid would shell out Rs 76.30 crore for procurement of telecom equipment, operation support system and other telecom network requirements among others.    The Grid said this project is estimated to be ready in one year from the date of award. The company would be developing a Transmission System for Solapur STPP (2x660 mw) at an estimated cost of Rs 63.32 crore with a commissioning schedule of 24 months from the date of investment.