Naturgy Energy Group S.A. operates predominantly in regulated electricity and gas distribution, which provides highly visible, stable cash flows typical of investment‑grade utilities. Its credit profile sits in the BBB area (Net Debt/EBITDA ≈ 2.7x, FFO/Net Debt ≈ 28% and Moody's leverage improving), indicating solid financial health and the ability to service and refinance debt. The company already has a history of hybrid issuance (first hybrid in 2013 and further issuance in 2021‑2022), demonstrating both market credibility and an established hybrid‑bond investor base. Hybrid proceeds can be used for refinancing upcoming maturities, extending debt duration and improving leverage/interest‑coverage metrics, which aligns with the “strong refinancing rationale” and “material rating‑headroom improvement” criteria. Given its regulated‑utility nature, investment‑grade standing, existing hybrid program and clear use of proceeds, Naturgy meets the profile for strong suitability to issue hybrid bonds.

<answer>Strongly Suitable</answer>