This question was asked inGPSC AE (Electrical) Class-2 R&B Department Paper 2025 – Series MQuestion 116 of 179 published · Gujarat Public Service CommissionOpen paper
Q236EasyLoad Curves & Tariffs

Which of the following has the highest operating cost?

Answer & step-by-step solution
Correct answer: B. Thermal power plant
Quick explanation

Among the listed conventional choices, a thermal power plant has high operating cost because it continuously consumes large quantities of fuel and requires fuel handling, ash handling, boiler operation and significant maintenance. Hydroelectric/solar plants have very low fuel cost.

Operating cost includes:

Concept & Reasoning

Operating cost is different from initial capital cost. Thermal stations can have lower initial cost than large hydro/nuclear projects, but coal/gas/oil fuel expense dominates recurring cost. Nuclear fuel volume is small even though nuclear plants have high capital, safety and decommissioning costs.

How to Solve It in the Exam

High recurring fuel requirement → high operating cost.

Important Exam Point

Read whether question asks capital cost or operating cost.

Quick Trick

High recurring fuel requirement → high operating cost.

Common Mistake

Choosing nuclear solely because its construction cost is high.

Solution diagram – Which of the following has the highest operating cost?
Exam tipRead whether question asks capital cost or operating cost.
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