Energy Systems Commissioning Technicians validate systems such as HVAC, electrical distribution, and energy management systems using testing tools, sensors, and monitoring platforms. They perform functional testing, calibration, and troubleshooting. Responsibilities include system verification, documentation, and coordination with project teams. Work environments include commercial buildings and industrial facilities. They follow commissioning standards and safety protocols. Their role ensures system efficiency, reduces operational issues, and supports energy performance, making them essential in building and industrial energy systems globally.