Band 4.5 IELTS Writing Task 1 Model Answer
Overall Band Score: 4.5 · Cambridge IELTS 12 · 2026-10-25
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 4.5)
the diagram show how geothermal engery work to produce energy in the diagram geothermal power plant number 1 cold water number 2 the injection wall number 3 the production well number 4 condenser number 5 is generator turbine this all are mention in the diagram
number 1 cold water 4.5 km long under ground cold water help geothermal zone hot rock hot water pumped up direct to condesner the number 2 the injection wall made of concread well to procect number 3 the production wellis on the right side straight down of condesner number 4 is condesner hot water pumped up and make steam number 5 is generator turbine steam go to the turbine that work from steam powered by steam and generator powered by turbine and produce electricity that connected to geothermal power plant this diagram show to geothermal power plant works and what is the process
AI examiner evaluation
| Criterion | Band |
|---|---|
| Task Achievement / Task Response | 4.0 |
| Coherence and Cohesion | 4.0 |
| Lexical Resource | 5.0 |
| Grammatical Range and Accuracy | 4.5 |
| Overall | 4.5 |
Task Achievement / Task Response: Band 4.0
You identify the topic and several relevant stages, including cold water, the two wells, hot rocks, steam, and the turbine-generator sequence. However, the process is only minimally described, and some details are inaccurate or unclear: the 4.5 km measurement refers to the depth of the injection well, not the length of the cold water, and the numbered stages are confused when you call the generator and turbine “number 5.” The overview is also vague and does not clearly summarise how water is heated underground and then used to generate electricity. The response is 148 words, so it does not meet the 150-word minimum. To improve, describe the stages in order and accurately distinguish the condenser, turbine, and generator.
Coherence and Cohesion: Band 4.0
There is a basic attempt to follow the process from cold water through the wells to steam and electricity, and the numbered references show an effort to organise the information. However, the response is largely one continuous block, with no clear paragraphing or distinct overview. Ideas are often joined without clear links, as in “cold water help geothermal zone hot rock hot water pumped up direct to condesner,” so the reader has to infer the relationships between stages. Repetition of “number” and “the diagram” also makes progression difficult to follow. Use a short overview followed by a step-by-step paragraph, and connect each stage with clear sequencing expressions such as “next,” “after this,” and “finally.”
Lexical Resource: Band 5.0
You use some relevant process vocabulary, including “injection well,” “production well,” “geothermal zone,” “steam,” and “electricity.” These terms show awareness of the diagram’s subject. However, the range is basic and repetitive, and several spelling or word-choice errors make parts difficult to understand, including “engery,” “wall” for “well,” “concread,” and “condesner.” Some phrases are also imprecise, such as “cold water help geothermal zone hot rock” and “connected to geothermal power plant,” which do not clearly describe the process. Build a more accurate set of process verbs and collocations, for example “is pumped down,” “is heated by hot rocks,” and “drives the generator.”
Grammatical Range and Accuracy: Band 4.5
The response attempts to describe several stages in connected sentences, but grammatical control is very limited and errors frequently make the relationships between ideas unclear. For example, “the diagram show” lacks subject–verb agreement, while “cold water help geothermal zone hot rock” has no clear sentence structure. Verb forms and articles are also often missing, as in “hot water pumped up” and “number 4 is condesner.” Punctuation is largely absent, creating long run-on sequences that are difficult to interpret. Practise writing short, complete sentences with a subject and verb for each stage, then combine them using accurate clauses: “Cold water is pumped underground, where hot rocks heat it.”
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