No cell can produce its own energy in the sense of creating energy from nothing. All cells rely on external sources of energy, primarily from organic molecules like glucose, to fuel their processes.

However, there are some cells that cannot produce their own ATP, the primary energy currency of cells, through cellular respiration. These cells are obligate anaerobes, meaning they can only survive in environments without oxygen. They obtain their energy through fermentation, which is less efficient than respiration and produces less ATP.

Examples of obligate anaerobes include:

* Some bacteria: These include bacteria that live in the gut, soil, and other oxygen-deprived environments.

* Certain parasites: Some parasites, like the one that causes malaria, can only survive in the absence of oxygen.

It's important to remember that all cells need energy, and they obtain it from external sources. The difference lies in the specific pathways they use to convert that energy into usable forms like ATP.