Tech who runs and maintains the mobile generator on set — knows the power draw of every light. Your lifeline to electricity.
The Genny Operator literally sits between you and your lighting. Nothing runs without them – and that's not meant metaphorically. They operate and monitor the mobile power generator, the so-called Genny, and must know in real-time what load is currently connected to the system. Every HMI, every Tungsten, every Kino Flo consumes a different amount of power, and if the Genny is overloaded, the voltage drops – your lights flicker, the color shifts, the sound is damaged. The Genny Operator prevents this.
Their work begins before the first light is set up: they must understand the load calculation. If you're working with 18k HMIs, several 2.5k Tungstens, and a number of practicals, it quickly adds up to 60, 80, sometimes 120 amps. The Genny – usually a 60, 100, or 150 in practice – has a maximum capacity, and the operator must know where the limits are. They work closely with the Gaffer, who plans the lighting, and with the Best Boy, who coordinates the load-out. On large sets, there are often multiple Gennys running in parallel – synchronizing them is then their job.
On set itself, they sit at the control panel or distribution box and constantly monitor the amp readings. They start the Genny, keep it warm, check the fuel, monitor the engine temperature. When lights are switched on and off, they see the load change in real-time. An inexperienced operator can bring a whole shooting day to a standstill through overloading – or worse: cause cable fires. You recognize a good Genny Operator by the fact that the power supply is invisible: it simply works.
Their responsibility also extends to safety. They must lay cables, check grounding, and be able to handle damp ground. On exterior shoots in difficult terrain, they are often also part of the problem-solving team. And last but not least: they must maintain their Genny like a pilot maintains their aircraft. A defective generator is not only expensive – it can bring your entire production to a halt.