Diesel Generator to Mains Connection

I'm seeking an expert in electrical work, ideally with experience in diesel generators, to connect my generator to the building's mains. The goal is to reduce electricity costs, so I need someone who can ensure efficient usage. Below are some specifics:

- Purpose: The generator will be used to reduce electricity costs, meaning it should be connected in a way that optimally uses its power during operation.
- Generator type: The generator is diesel-fueled, so any experience with these types of generators will be useful.
- Power requirements: The generator needs to supply power to the entire building. This includes all systems and appliances within the building.

Ideally, the freelancer has previous experience with similar large-scale generator installations and a deep understanding of power management. Knowledge about diesel generators is a must. Efficiency and reliability should be the main focus of this setup.