SEPCOIII Electric Power Construction Co., Ltd., also known as SEPCO3, is a leading Chinese construction and engineering company focused on the power sector. Founded in 1985, the company is headquartered in China and operates globally, with notable projects in countries such as Egypt, India, Indonesia, Jordan, Nigeria, Oman, Saudi Arabia, and Singapore.

SEPCOIII specializes in the design, construction, operation, and ownership of power plants using the Engineering, Procurement, and Construction (EPC) method. The company offers a diverse range of power technologies, including thermal, nuclear, gas-fired, wind, biomass, solar, and hydro power, as well as substations. SEPCOIII also engages in project development through Build-Operate-Transfer (BOT) and Build-Operate-Own(-Transfer) (BOO(T)) models, managing various aspects like logistics, operation, maintenance, and financing internally. The company has a strong presence in the Indian market, contributing significantly to the power generation construction sector.