Environmental awareness plays a vital role in shaping the behaviour of today’s consumers, influencing their purchasing decisions and their interactions with the marketplace. Marketing communications that emphasise environmentally friendly product features, packaging, and even product names have a significant impact on purchase decisions. Consumers who prioritise environmental concerns are often willing to pay more and are more likely to select environmentally friendly products. An example of greenwashing in the energy market is eco-pea coal. The purpose of this study is to explore the impact of knowledge about greenwashing on the perception of coal products by employees of coal depots. To achieve this, a survey (CAWI) was conducted with a sample of 300 coal depot employees. The study aimed to determine whether employees in the energy sector are familiar with the issue of greenwashing, how this knowledge influences their perception of the environmental impact of burning high-quality coal, and whether awareness of the term greenwashing affects their opinions on the environmental friendliness of eco-pea coal. The research also examined respondents’ attitudes towards renaming eco-pea coal and its colloquial use. An analysis of coal product terminology and relevant legal regulations was conducted. The study identified the characteristics of eco-pea coal and compared these features with those of other coal products. The findings revealed that employees’ perceptions of coal products and their characteristics varied according to their level of awareness regarding greenwashing. The results emphasize the importance of training coal depot employees to ensure consistent terminology and accurate descriptions of coal assortments, preventing potential consumer misguidance.