To assess whether Naturgy Energy Group S.A. is suitable to issue hybrid bonds, we evaluate its financial profile based on the 2022 annual report data:

1.  **Profitability and Cash Flow:** The company exhibits strong operational performance, with EBITDA increasing from 3,529 million EUR in 2021 to 4,954 million EUR in 2022. Operating cash flow improved significantly to 4,242 million EUR in 2022 from 1,001 million EUR in 2021.
2.  **Capital Structure and Leverage:** Equity attributable to owners of the parent grew from 5,889 million EUR to 7,574 million EUR, reflecting a solid capital base. While the company holds substantial financial liabilities (Noncurrent financial liabilities of 13,999 million EUR), its ability to generate consistent cash flow and its established position as a major energy group provide the necessary financial cushion for hybrid instruments, which are often used to optimize capital structure without diluting equity or significantly impacting credit ratings.
3.  **Stability:** The company has a history of consistent dividend payments (1,467 million EUR in 2022) and has a clear legal and corporate structure. The ability to manage interest costs (837 million EUR in 2022) while maintaining positive net profit (1,649 million EUR attributable to the parent) suggests sufficient coverage.

Hybrid bonds are suitable for companies with stable cash flows, established investment-grade characteristics, and a need for capital management. Naturgy's robust EBITDA growth and healthy cash conversion make it a strong candidate for such instruments.

<answer>Strongly Suitable</answer>