Terra Clean (TeCL), a wholly owned subsidiary of the Indian Oil Corporation, has invited bids for the empanelment of engineering, procurement, and construction (EPC) contractors for design, engineering, supply, construction, testing, and commissioning of pooling substation, extra high voltage (EHV) transmission line, associated power evacuation system, and related works for interstate transmission system (ISTS) and intrastate transmission system (InSTS)-connected renewable projects (solar/wind/wind-solar hybrid projects with or without battery storage).