Band 7.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 7.0 · Cambridge IELTS 12 · 2026-09-05

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 7.0)

The diagram illustrates the process by which geothermal energy is used to generate electricity in a geothermal power plant.

Overall, the process consists of five main stages, beginning with cold water being pumped underground and ending with electricity being produced by generator. The water is heated by hot rocks and is then converted into steam to power Turbines.

First, cold water is pumped down to a depth of approximately 4.5 km through an injection well . It then passes through geothermal zone, where the hot rocks heat the water. The resulting hot water is pumped back to the surface through a production well.

Next, the hot water enters a condenser, where it converted into stream. This steam is then directed towards a turbine, causing it to rotate. The rotating turbine powers a generator , which produces electricity. Finally , the electricity is transmitted through power lines for use. Thus, geothermal energy is converted into electricity through the combined processes of underground heating, steam production, and mechanical generation.

AI examiner evaluation

Task Achievement / Task Response — Band 7.0

The response successfully covers all stages of the geothermal energy production process. You have clearly identified the main features, such as the injection well, the geothermal zone, the production well, the condenser, and the turbine/generator system. The overview provides a concise summary of the process, which is essential for a high band score. You have also made logical connections between the stages. To reach a higher band, ensure that you explicitly mention the depth (4.5 km) and the temperature of the rocks if provided in the diagram, as these specific details help in fully reporting the information provided in the prompt.

Coherence and Cohesion — Band 7.0

The response is logically organized, with a clear introduction, a body paragraph detailing the process, and a concluding summary. The use of cohesive devices such as 'First', 'Next', and 'Finally' helps the reader follow the sequence of events effectively. Paragraphing is used appropriately to separate the overview from the detailed description. The flow of information is smooth, and the progression from the injection of water to the final electricity transmission is easy to follow. To improve, ensure that referencing is consistent throughout the text to avoid any potential ambiguity.

Lexical Resource — Band 6.5

You have used a good range of vocabulary relevant to the topic, such as 'geothermal energy', 'injection well', 'condenser', and 'mechanical generation'. The terminology is accurate and appropriate for an academic report. There are a few minor errors, such as 'converted into stream' (should be 'steam') and 'generator' (which is fine, but could be more descriptive). The vocabulary is sufficient to convey the process clearly. To achieve a higher band, try to incorporate more precise collocations or varied synonyms to describe the movement of fluids and energy conversion.

Grammatical Range and Accuracy — Band 6.5

The response demonstrates a good control of grammatical structures. You have used a mix of simple and complex sentences effectively, such as 'The resulting hot water is pumped back to the surface through a production well.' There are some minor punctuation and mechanical errors, such as the space before the period in 'generator .' and 'Finally ,'. Additionally, 'where it converted' is missing the auxiliary verb 'is'. Despite these minor slips, the majority of your sentences are error-free, and the meaning is never obscured. Focusing on proofreading for small typos will help improve your accuracy.

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

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