The Delhi Metro has begun a ‘Green Corridor’ pilot between Janakpuri West and RK Ashram stations. Solar panels installed on roofs and soundproofing acrylic tunnels generate energy used to power escalators, lights, and station HVAC systems. Energy-sharing smart inverters supply surplus energy back to the Delhi Metro grid. The pilot has reduced energy consumption by 20% and cut operating costs. The project will extend to 50 stations by 2026.