The Heavy Engineering Corporation (HEC) has invited expressions of interest from developers and contractors to construct 2 MW-10 MW of rooftop solar projects at the HEC premises in Ranchi. The scope of work includes design, supply, erection and supervision, and commissioning of rooftop systems. The HEC has also mandated that the applicant must be a reputed firm incorporated in India. The project will be executed on build, own, operate and transfer (BOOT) basis for a period of 10 years and have a 25-year warranty for the entire installation, with guaranteed efficiency and output of not less than 80 percent. The last date for bid submission is June 5, 2017.