Which is a disadvantage of combustion engines and turbines?

Combustion engines and turbines have a significant disadvantage in that they generally have a small and limited capacity when compared to other forms of power generation, such as hydroelectric or nuclear power. This limited capacity can restrict their application to smaller power generation needs or make them less efficient when trying to meet high demand scenarios.

The size and scalability of combustion engines and turbines mean that they are often less suitable for large-scale energy production. When demand increases or when there's a need for a more substantial and stable energy supply, these systems may struggle to keep up, leading to potential reliability and supply challenges.

This disadvantage is particularly pronounced in applications where high energy output is necessary or when continuous power generation is required over longer periods, as larger systems are typically preferred in such cases for their efficiency and sustainability.