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 systems; cabling systems; circuit wiring for lighting; lightings systems, such as light fittings, emergency lightings, and building façade lightings; ceiling and wall fans, including switches, regulators, and switch devices; power supply systems comprising CCTV, security access control, and public address systems; telephone cabling systems, such as cables, conduits, and accessories and equipment; information technology systems, including cabling system for servers and data outlets; car parking systems comprising entry and exit points controlled by microprocessors, cash card readers, and related data communication systems; security systems, such as contactless card readers, door controlling systems, and emergency breakglass systems; CATV systems; and lightning protection systems. It is also involved in the installation works of air-conditioning systems, 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 sprinklers, fire hosereel, 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.