FuelCell Energy (FCEL) presents a compelling narrative with its clean energy technology, particularly in the context of the growing demand for reliable power solutions. In the first quarter of FY2026, the company achieved a 61% year-over-year revenue growth, totaling $30.5 million. However, this growth is largely attributed to non-recurring projects rather than new clients in the AI and data center sectors. Despite a significant backlog of $1.17 billion, this figure has declined compared to the previous year, raising concerns about the sustainability of future revenue, which is predominantly linked to long-term, low-margin contracts. FCEL's stock is currently trading at a steep 7.25x EV/Sales TTM, and the company continues to report gross losses, with its financial stability relying on external financing rather than operational profits. This combination of factors makes FCEL a high-risk investment, as the promise of its technology does not yet translate into solid business fundamentals.