Band 4.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.0 · Cambridge IELTS 12 · 2026-09-28

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 4.0)

The given process diagram illustrates about the production of electricty in Geothermanl power plant , Overall the process complete in five steps it start from cold water and ended to the generater turbine steps

Firstly as wee can see that cold water is fell down to the injection well where rocks are rocks are heated through the geothermal plant

and thereforce the production well piumped the hot water to the condenser where water are steam and converted into clouds eventually the water clouds goes through by steam in trubine to generater where powered by trubine generater produce electricity and supply to the geothermal power plant

AI examiner evaluation

Task Achievement / Task Response: Band 4.0

The response is severely under-length, containing only 105 words compared to the minimum requirement of 150 words. This significantly limits the development of the response. While the student attempts to outline the main steps of the geothermal energy production process, such as mentioning cold water, the injection well, hot rocks, and the turbine/generator, the description is extremely brief and lacks adequate detail. There is an attempt at an overview ('Overall the process complete in five steps'), but key aspects of the visual data—such as the 4.5 km depth, the role of the condenser, and the cyclic nature of the process—are omitted or inaccurately described. Consequently, Task Achievement is penalised for both insufficient length and incomplete coverage of the diagram.

Coherence and Cohesion: Band 4.0

The response suffers from major organisational and mechanical issues. It is written as a single, dense paragraph with virtually no punctuation, making it extremely difficult to follow the progression of the steps. While transition words like 'Firstly' and 'eventually' are attempted, the lack of full stops and proper sentence boundaries results in run-on sentences. Paragraphing is absent, and cohesive devices are poorly managed due to the severe lack of punctuation. There is some logical sequencing attempted (starting from cold water to electricity generation), but the overall structure fails to meet the standards for clear logical progression.

Lexical Resource: Band 4.5

The vocabulary used is very basic and repetitive, with several spelling errors ('electricty', 'Geothermanl', 'generater', 'piumped', 'trubine'). The student relies on simple terms and struggles with precise technical vocabulary related to the process diagram, writing 'water are steam and converted into clouds' instead of describing steam generation correctly. While there are basic words related to the topic (e.g., 'water', 'rocks', 'generator'), the range is very limited, and frequent lexical errors cause strain for the reader, placing this criterion at Band 4.5.

Grammatical Range and Accuracy: Band 4.0

Grammatical control is weak throughout the text. The complete absence of punctuation means there are no proper sentences, but rather long, disjointed clauses strung together with conjunctions. There are frequent structural errors, such as 'cold water is fell down', 'rocks are rocks are heated', and 'the water clouds goes through by steam'. Complex sentence forms are either non-existent or structurally faulty. Errors are pervasive and constantly impede communication, justifying a Band 4.0.

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