---
title: "Advantages and disadvantages of steam plant"
subject: "Power Plant Equipment"
chapter: 7
key: "semester_7/power_plant_equipment:steam-plant-merits-demerits"
source: https://www.bctengineer.com/q/semester_7/power_plant_equipment/steam-plant-merits-demerits
site: BCT Engineering
---

# Advantages and disadvantages of steam plant

Power Plant Equipment · Chapter 7: Thermal (Steam) Power Plant

- Asked in: 2074 Chaitra, 5 marks
- Video: [Advantages & Disadvantages of Steam Power Plant by Prof. Neeti Dugaya](https://www.youtube.com/watch?v=7gCLnxtkyWo) — SIRT EX DEPT.
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/power_plant_equipment/steam-plant-merits-demerits
- Whole chapter: https://www.bctengineer.com/md/semester_7/power_plant_equipment/chapter-7

## Question

What are the advantages and disadvantages of steam power plant?

## Short answer

Advantages: low initial cost, short construction, can be sited near loads, fuel widely available, large unit sizes. Disadvantages: high running cost, low efficiency (~30–40%), air and thermal pollution, large cooling water demand, slow start-up, and ash handling issues.

## Answer

A steam power plant converts the heat of fuel (coal, oil, gas) into electricity using a boiler, steam turbine and generator on the Rankine cycle.

#### Advantages

- Fuel is cheaper and widely available; **initial cost is lower** than hydro and nuclear plants.
- Can be built **near the load centre**, reducing transmission cost and losses.
- Requires **less space** than a hydro plant of equal capacity.
- **Construction time is short.**
- Not dependent on rainfall; suitable for **base load** throughout the year.
- Large unit sizes are possible; exhaust/bled steam can be used for **process heating**.
- Good overload capacity.

#### Disadvantages

- **High running cost** (fuel cost is continuous, fuel price rises).
- **Low overall efficiency** (about 30-40%); large heat loss in condenser.
- **Air pollution** (CO2, SO2, NOx, fly ash) and thermal pollution of water.
- Needs **large amount of cooling water** and fuel transport.
- Problems of **ash handling and disposal**.
- **Slow start-up**; not suitable for peak loads.
- Maintenance and operating staff costs are higher than hydro; plant life is shorter.

| Aspect | Steam plant | Hydro plant (for comparison) |
|---|---|---|
| Initial cost | Lower | Higher |
| Running cost | High | Very low |
| Pollution | High | Nil |
| Location | Near load | At water source |

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. How does a steam plant's initial cost compare to hydro, and its running cost?
   A. Lower initial cost, high running cost
   B. Higher initial cost, low running cost
   C. Lower initial and running cost
   D. Higher both
   Answer: A. Steam plants cost less to build but have continuing fuel costs. (Key point: Cost comparison)

2. Why can a steam plant be built near the load centre?
   A. It does not depend on a water source like hydro, so transmission cost and losses fall
   B. It produces no waste
   C. It needs no cooling water
   D. It has no fuel transport
   Answer: A. Siting near load reduces transmission cost and losses. (Key point: Location advantage)

3. Which is a disadvantage of steam plants?
   A. Dependence on rainfall
   B. Air and thermal pollution and low overall efficiency of about 30-40%
   C. Very long construction time
   D. Zero fuel need
   Answer: B. Emissions, large condenser heat loss and ash handling are drawbacks. (Key point: Disadvantage)

4. Why are steam plants unsuitable for peak loads?
   A. Slow start-up
   B. Instant start-up
   C. No overload ability
   D. Zero output
   Answer: A. Boilers take long to start, so they suit base load. (Key point: Operating suitability)

## Related in Power Plant Equipment

- [Steam plant improvement methods and reheating](https://www.bctengineer.com/question.md?key=semester_7%2Fpower_plant_equipment%3Asteam-methods-reheating) — Power Plant Equipment, chapter 7, asked 4×
- [Steam plant improvement methods and regeneration](https://www.bctengineer.com/question.md?key=semester_7%2Fpower_plant_equipment%3Asteam-methods-regeneration) — Power Plant Equipment, chapter 7, asked 2×
- [Steam plant components and reheating](https://www.bctengineer.com/question.md?key=semester_7%2Fpower_plant_equipment%3Asteam-components-reheating) — Power Plant Equipment, chapter 7
- [Steam plant components and performance improvement](https://www.bctengineer.com/question.md?key=semester_7%2Fpower_plant_equipment%3Asteam-components-performance) — Power Plant Equipment, chapter 7
- [Regeneration in steam plant with P-V and T-S](https://www.bctengineer.com/question.md?key=semester_7%2Fpower_plant_equipment%3Asteam-regeneration-pv-ts) — Power Plant Equipment, chapter 7
- [Reheater in steam plant with layout](https://www.bctengineer.com/question.md?key=semester_7%2Fpower_plant_equipment%3Asteam-reheater-layout) — Power Plant Equipment, chapter 7

## Related in other subjects

- [Simple Rankine plant 2 MPa / 20 kPa: efficiency, power](https://www.bctengineer.com/question.md?key=semester_2%2Ffundamental_of_thermodynamics_and_heat_transfer%3Arankine-2mpa-20kpa-50kgs) — Fundamental of Thermodynamics & Heat Transfer, chapter 6
- [Types of power supply system for industrial plant](https://www.bctengineer.com/question.md?key=semester_6%2Findustrial_power_distribution_and_illumination%3Aindustrial-supply-system-types) — Industrial Power Distribution and Illumination, chapter 1, asked 2×
- [Thermal versus nuclear power plant](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Athermal-vs-nuclear) — Power Plant Design, chapter 1, asked 2×
- [Firm power and plant load factors](https://www.bctengineer.com/question.md?key=semester_6%2Fhydro_power%3Afirm-power-load-factors) — Hydro Power, chapter 3