Band 6.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 6.5 · Cambridge IELTS 12 · 2026-08-20

IELTS Writing Task 1 question

The diagram below shows how geothermal energy is used to produce electricity.

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

Student answer (Band 6.5)

The diagram illustrates the generation of electricity by means of geothermal energy.

Overall, geothermal electricity is generated through a series of stages in which cold water is injected deep underground, heated by hot rocks, and converted into steam. The steam then drives a turbine connected to a generator, while the condensed water is recycled through the system.

In the initial phase , cold water is injected underground through an injection well which extends approximately 4.5 km below the ground. Almost 5 km below the ground there is a geothermal zone which consists of hot rocks. Hot rocks heat the cold water, converting it into hot water. The heated water is then pumped towards the surface, where it is converted into steam.

After passing through the turbine, the steam enters a condenser, where it is cooled and converted back into water. Steam then drives the turbine which is connected to a generator to produce electricity . Finally, the electricity is transmitted to consumers through power lines.

AI examiner evaluation

Task Achievement / Task Response — Band 6.0

The response clearly addresses the task by summarizing the diagram on how geothermal energy is used to generate electricity. The sequence of processes is described logically, demonstrating an understanding of the overall function and steps. However, the response could benefit from more explicit discussions of the main features and comparisons, such as efficiency or location, to achieve a higher band score.

Coherence and Cohesion — Band 6.5

The coherence and cohesion of the response are generally strong, with a clear progression from the introduction to each stage of the process. Linking words such as 'Overall', 'In the initial phase', and 'Finally' provide good transitions. However, there could be more cohesive devices used to enhance the flow between sentences, as some sections feel slightly disjointed, particularly during the description of the turbine and generator.

Lexical Resource — Band 6.0

The lexical resource demonstrates adequate range, though some phrases are repetitive. Terms like 'hot rocks', 'cold water', and 'steam' are appropriate; yet, variations could enhance richness. There were instances of slight imprecision, such as stating 'almost 5 km below the ground' which could be more definitively stated. A wider range of vocabulary would contribute to a higher band.

Grammatical Range and Accuracy — Band 6.5

The grammatical range and accuracy are solid, with mostly correct sentence structures and clear communication. There are a few minor errors, such as awkward phrasing ('through a series of stages in which cold water is injected deep underground') and unnecessary spacing ('in the initial phase ,'). However, overall, these do not significantly hinder comprehension and the student's grammatical abilities are evident.

Overall feedback

Your response effectively outlines the process of generating electricity using geothermal energy, showcasing a clear understanding of the diagram. The logical progression from one stage to another is commendable. To improve, consider elaborating on more specific details and comparisons that emphasize the significance of geothermal energy. Additionally, varying your vocabulary and using more synonyms can enhance the richness of your language. Strengthening cohesion with varied linking devices will also benefit the overall fluency of your writing.

See this exact question answered at other band scores — the same prompt compared across bands.

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