Which term describes a power source whose generating capacity changes with the time of day, weather conditions, or other factors?

• A. variable generation
• B. baseload power
• C. dispatchable generation
• D. constant output source

Answer: (A)

Variable generation describes a power source whose output changes with time of day, weather conditions, or other factors. This captures how solar and wind produce different amounts of electricity as sunlight or wind speeds vary, so their capacity isn’t constant. Baseload power refers to plants designed to run continuously at a steady level to meet the minimum demand, so their output is kept constant rather than governed by environmental conditions. Dispatchable generation, while capable of being increased or decreased on demand, is defined by controllability rather than being inherently variable due to weather or time of day. A constant output source would imply fixed production regardless of conditions, which doesn’t reflect how real-world energy systems operate. For these reasons, the best term to describe a power source whose capacity changes with external factors is variable generation.