Interroyal Engineering Public Company Limited provides integrated power, renewable energy, and business solutions. Its power plant offerings include soot blowers, heating elements, electrostatic precipitators, industrial fans, steel grinding balls, rubber liners, mist eliminators, slurry pumps, propeller stirrers, dewatering systems, and fill packs for cooling systems. The company also supplies industrial wastewater equipment, liquid handling and flow control equipment, UPS products, lead acid batteries, and electric generators, and designs and installs tunnel and metro ventilation systems. Additional services include solar pump systems, digital power infrastructure, wired and wireless networks, maintenance, market intelligence and forecasting, portfolio optimization, and project finance. It serves power plants, cement plants, petrochemical facilities, and oil refineries, and was incorporated in 1992 in Bangkok, Thailand.