Band 4.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.5 · Cambridge IELTS 14 · 2026-10-07

IELTS Writing Task 1 question

The diagram below shows how electricity is generated in a hydroelectric power station.

Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

Student answer (Band 4.5)

The diagram illustrates the properties of electricity in a hydroelectric power. Summarise the knowledge by selecting and reporting the main features, and make comparisons where relevant.

Ovrall, broadband was the most prevelant type of electricity in a hydroelectric power station. By contrast, power is going from hight level to low level. First is from river to low-level reservior.

looking at the diagram more closely, Hydroelectric power station has different ways of power. first of all the power go from river with the help of high-level reservoir and the power going into the dam with intake.

turning to the other side of power it is going with the flow of water to generate electricity and its lower side we see flow of water during the pumping at night. and then power go on into station with the help og generator and we see power lines and nation grid and its lower side of diagram we can see the power is ended with low-level reservior. Its all process tell the how the electricity move at day and at night and we learn about at the day reversible turbines work, but at night water pump into high-level reservoir.

AI examiner evaluation

Task Achievement / Task Response: Band 4.5

You identify the central day–night cycle: water moves from the high-level reservoir through the station during the day, while it is pumped back at night. However, the account is only partially accurate and the main stages are not clearly reported. The claim that “broadband was the most prevalent type of electricity” is unsupported and unrelated to the diagram; the diagram shows no comparison of electricity types. You also say the water first goes “from river to low-level reservoir,” whereas the river feeds the high-level reservoir. The generator, power lines and national grid are mentioned, but their role in producing and transmitting electricity is not explained clearly. Focus on the actual sequence and give a concise, accurate overview of the two operating modes.

Coherence and Cohesion: Band 4.5

There is an attempt to organise the response with an overview followed by details, and phrases such as “First of all” and “turning to the other side” signal movement through the diagram. However, the progression is difficult to follow because stages are combined in long, loosely connected sentences, and the order is sometimes unclear. For example, “the power go on into station with the help og generator” does not make the relationship between the turbines, generator and power lines clear. The repeated use of “and” also makes the description feel like a list rather than a sequence. Use separate paragraphs for the overview and process details, then connect each stage with precise sequencing and reference words.

Lexical Resource: Band 4.5

The response uses some relevant process vocabulary, including “high-level reservoir,” “intake,” “generator,” “power lines” and “low-level reservoir.” This shows basic awareness of the diagram’s terminology. However, vocabulary is repetitive and several word choices are inaccurate or unclear, which can strain the reader’s understanding. “Broadband” does not describe a feature of this process, and “properties of electricity” is not a natural way to introduce the diagram. Repeatedly using “power” also obscures whether you mean water flow, electricity generation or transmission. Spelling errors such as “prevelant,” “reservior” and “hight” further reduce clarity. Use the diagram’s exact labels and choose verbs such as “flows,” “drives” and “transmits” to distinguish the stages.

Grammatical Range and Accuracy: Band 4.5

You attempt both simple and longer sentences, but control is limited and errors frequently make relationships between stages unclear. Examples include “the power go from river” and “the power is ended with low-level reservior,” where verb forms and sentence construction are faulty. In “Its all process tell the how the electricity move,” the sentence has problems with agreement, article use and word order. Capitalisation is also inconsistent, as in “Hydroelectric power station” after a comma. Most clauses rely on basic patterns joined with “and,” so the range remains narrow. Build accurate simple sentences first—for example, “During the day, water flows through the turbines and drives the generator”—then add a few controlled clauses to explain the night-time cycle.

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