To decide the capacity of a power station, it is crucial to consider the expected maximum electrical demand and future load growth requirements. This is because the primary function of a power station is to generate electricity to meet consumer demand. Let's explore this in more detail:

1. Expected Maximum Electrical Demand: This refers to the highest level of electrical power that the power station is expected to supply at any point in time. It is essential to ensure that the power station's capacity can handle this peak demand to avoid insufficient power supply and potential blackouts.
2. Future Load Growth Requirements: It is critical to anticipate growth in electrical demand due to urban development, industrial expansion, or population increase. Planning for future load growth ensures that the power station remains adequate over time, avoiding the need for constant upgrades or expansions.

Now, let's evaluate why the other options are not relevant to determining the capacity of a power station:

• Type of paint applied on generating station external building surfaces: This is related to the aesthetics and environmental protection but does not affect the capacity or efficiency of power generation.
• Number of ceiling fans installed inside administrative office sections: This is a minor consideration regarding energy consumption within the facility and does not impact the overall generating capacity.
• Shape of fencing structure surrounding the generating station premises: The design of the fencing does not influence the power generation capacity, though it might relate to security.

The choice of capacity is directly linked to how well the power station can meet both current and future energy needs, ensuring reliability and efficient operation. Therefore, the correct answer is indeed the consideration of expected maximum electrical demand and future load growth requirements.