bids are invited for operation and maintenance of electrical systems/electrical installations - providing operation maintenance of electrical systemsubstationbms solar system dg sets hvac system and elevators at neer shakti sadan office complex sector33 nhpc limited se.. , operation and maintenance of electrical systems/electrical installations - providing operation maintenance of electrical and mechanical installations and operation of dg sets chillers elevators at jyoti sadan of nhpc limited corporate office secto.. , operation and maintenance of electrical systems/electrical installations - providing operation maintenance of electrical mechanical installations at nhpc residential complex sector 41 faridabad for two years as per sow scc in atc of bid , operation and maintenance of electrical systems/electrical installations - providing ppe tools consumable tp for operation maintenance of electrical mechanical installations at nhpc limited office complexsector33 and residential complex sector41 fa. total quantity :