An electric generator is a device that converts mechanical energy obtained from an external source into electrical energy as the output. The modern-day generator works on the principle of electromagnetic induction, the flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field. This movement creates a voltage difference between the two ends of the wire or electrical conductor, which in turn causes the electric charges to flow, thus generating electric current. There are several types of generators. Industrial generators are available in a range of sizes, from around 20kW to well over 3MW. Larger business and industrial applications obviously require more capacity and thus often utilize three-phase motors for higher power. Office buildings, manufacturing facilities, data centers, and building complexes such as shopping malls, educational institutions, and living centers all require larger-capacity generators. This is the case whether it’s regarding primary power supply or emergency back-up power generation. For the current case which is the sport complex the backup generation is highly needed for the stadium since the power should not be disturbed at all during any event.

Since the generator is mainly for the stadium, the active power of the stadium is 1037.225 MW. To calculate the size of the generator, the active power must be multiplied by 1.25 to cover the power needed in case of any failure in addition to adding a safety range.

The size of the generator = 1.25 x 1037.225 = 1296.53 MW

Since The power factor rating of most synchronous generators is typically between 0.8 lagging to 0.95 lagging, the load needed from the generator will be 1620.66 kVA when considering 0.8 power factor. The next generator size which can tolerate that load needed is 1750.00 kVA. Which is the one chosen for the backup generation for the football stadium.