ESI is an engineering and construction firm that specializes in the design and construction of steam and power facilities for industrial and utility clients. ESI also maintains a fleet of rental equipment which consists of boilers, deaerators, water softeners, boiler feedwater pumps, and chemical feed systems. Over the years, ESI has solved many steam and power problems including designing and building entire steam and power plants; as well as supplying rental equipment during emergency situations, maintenance shutdowns, or during those cold winter months.