Solis Holdings Limited, an investment holding company, operates as a design and build mechanical and electrical engineering contractor in Singapore. The company installs electrical-based systems, such as switchboards and switchgears, including circuit breakers, meters, protection devices, cables and cable boxes; standby generator system; cabling system; circuit wiring for lighting; lightings system, such as light fittings, emergency lightings, building façade lightings; ceiling and wall fans, including switches, regulators, and switch devices; power supply systems comprising CCTV, security access control, and public address system; telephone cabling system, such as cables, conduits, and accessories and equipment; information technology system, including cabling system for servers and data outlets; car parking system comprising entry and exit points controlled by microprocessors, cash card readers, and related data communication system; security system, such as contactless card readers, door controlling system, and emergency breakglass system; CATV system; and lightning protection system. It is also involved in the installation works of air-conditioning system, including air-conditioning units, refrigerant pipework and drainage works, and requisite insulation and fittings; mechanical ventilation systems, including exhaust air fans; and fire protection systems, which include fire alarm panels, heat detectors, fire sprinkler, fire hosereel, and hydrant systems, and clean gas total flooding systems. It serves private residential, mixed residential, and commercial developments, as well as institutional buildings. The company was founded in 1983 and is headquartered in Singapore. Solis Holdings Limited is a subsidiary of HMK Investment Holdings Limited.