Question

The advantage of hydro-electric power station over thermal power station is:

• A. The initial cost of hydro-electric power station is low
• B. The operation cost of hydro-electric power station is low
• C. Hydro-electric power station can supply the power throughout the year
• D. Hydro-electric station can be constructed at the place where the energy is required.

Hint:

Hydro plants have low running costs as water is free — unlike thermal plants with continuous fuel needs.

Answer 1

The Correct Option is B

Step 1: Capital vs operational cost
Although the capital (initial) cost of hydro plants is high due to dam and civil structure, their operational cost is low since water is freely available and no fuel is required.
Step 2: Thermal station cost comparison
Thermal plants require coal, oil or gas — recurring fuel costs contribute significantly to operational expenses.
Step 3: Conclusion
Thus, among the given options, the key advantage is low operational cost.