A generator is an essential tool in any scenario within various commercial environments – whether it’s needed on a construction site or at a large outdoor event, having access to power is vital to keep operations running.
How Industrial Generators Generate Electricity Independently
Industrial generators operate autonomously from the main grid by using an internal combustion engine to turn a rotor with an alternator which creates a magnetic field which induces a steady flow of electrical current – this process is known as electromagnetic induction.
We’ve written before about the core components of an industrial generator, each part of the generator works together to produce electricity, and are designed to provide reliable power to any heavy-duty application.
The Process of Electricity Generation
In industrial environments, electricity is more than a convenience but the backbone of production, automation, and large-scale operations. Manufacturing plants, processing facilities, data centres, and heavy industries depend on reliable, high-capacity power systems to keep equipment running efficiently and safely. Unlike domestic power consumption, industrial electricity generation often involves higher loads, specialised infrastructure, and enhanced reliability measures to minimise downtime and maintain productivity.
- Fuel Combustion: The engine burns fuel, which moves pistons within cylinders, creating linear motion.
- Mechanical Rotation: The motion of the pistons is converted into rotation via a crankshaft, which drives the alternator.
- Electromagnetic Induction: The rotating shaft spins a magnetic field (rotor) inside stationary copper coils (stator). This moving magnetic field causes electrons to move, inducing an electrical current (Faraday’s Law).
- Output Generation: The resulting electrical power is sent through the control panel to the facility’s electrical system.
What Powers a Commercial Generator Without Mains Supply
A commercial generator operating without a mains power supply is powered by internal combustion engines running on fuels such as diesel, natural gas and propane. The process can be broken down into three different components.
- The Primary Energy (Fuel Sources)
We use diesel as a fuel source for our generators, due to its durability, efficiency and long shelf life.
- Mechanical Power (Internal Engine)
The engine burns the fuel to create the rotational motion then creates the electrical current which drives the alternator.
- Startup Power
Even though the generator may not be connected to mains power, it will still need a source to start the engine. This is typically provided by a DC battery which powers a starter motor that cranks the engine until it can run on its own fuel.
In addition to the above you may want continuous independent operation of the generator. To function without mains power, these systems include:
Automatic Transfer Switch (ATS): Detects power loss and triggers the generator to start, isolating the building from the grid.
Voltage Regulator: Ensures stable, consistent power output to protect sensitive equipment.
Control Panel: Acts as the brain, monitoring engine health and fuel levels.
Cooling & Lubrication Systems: Prevent overheating and friction during extended, around-the-clock operation.
How Generators Support Critical Business Operations
A small disruption to your operations could act as a catalyst to even bigger problems, such as unplanned downtime, becoming a significant loss in several crucial areas. In 2026, manufacturers across the UK and Europe are projected to lose between £124 billion and £157 billion to unplanned downtime.
The table below shows some of the sectors we work with and what the potential financial impact is for 2026.
| Sector | Typical downtime frequency | Typical Duration | Estimated cost per hour |
|---|---|---|---|
| Automotive | 20-25 incidents/month | 3-6 hours | £1.6M - £2.0M |
| Food Processing | Weekly minor stoppages | 1-4 hours | £20k - £30k |
| Heavy Equipment | 2-3 major events/year | 6-12 hours | £170k - £350k |
| Pharmaceutical | 225-400 hrs/year | 10-24 hours | £1.1M - £5.2M |
| Chemicals | 400-600 hrs/year | 5-12 hours | £275k - £1.1M |
| Aerospace | Few major events/year | 5-10 hours | £275k - £1.1M |
Without a backup generator, you run the risk of losing money and increasing unfavourable reputation amongst your customers or clients – giving an advantage to competitors. Generators support critical business operations by acting like insurance to keep systems running in the unfortunate event of unplanned downtime.
