Colossus Infra Projects is a Nagpur-based electromechanical (E&M) infrastructure and project management company. It delivers design, supply, installation, testing and commissioning for large government infrastructure across Maharashtra and beyond, including work for Maha Metro. Its services cover HT & LT electrical works, HVAC, building management systems, and fire protection and alarm systems, including installation, service and inspection of firefighting, fire alarm and extinguishing systems. It is licensed by the Directorate of Maharashtra Fire Services as a fire-fighting installation (licence 2026/RF-366), detection & suppression (licence 2026/RD-379) and passive protection (licence 2026/RP-95) agency.