Chloroplasts in a cell can be compared to the solar panels in an airport.

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Chloroplasts contain chlorophyll and give the plant its green colour. The most important function of chloroplasts is to absorb light energy from a light source (e.g. the sun). This light energy is used in photosynthesis which is the process of converting carbon dioxide and water into glucose and oxygen. Photosynthesis allows plants to obtain energy from the sun to create their own food. 

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​Similar to chloroplasts, the solar panels in an airport use solar energy (sunlight) to produce electrical energy. Also, just as chloroplasts help with the photosynthesis which allows the plant to process its own food, solar panels help create electricity which helps airports process their own electrical energy. 

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Therefore, an analogy for the chloroplasts in a cell is the solar panels in an airport.