To determine suitability for hybrid bond issuance, key factors such as credit quality, cash flow stability, leverage, and coverage are examined.

**Credit quality and leverage**  
The company’s total debt (including borrowings and lease liabilities) is about €16.3 bn against EBITDA of €4.95 bn in 2023, giving a debt/EBITDA ratio of roughly 3.3× (≈2.5× on a net‑debt basis after cash). This level is typical for integrated utilities and within investment‑grade ranges.

**Coverage and cash generation**  
Operating cash flow for 2023 is €4.2 bn, comfortably covering interest expense (≈€0.8 bn) with an EBIT/interest ratio of ~3.7×. Free cash flow (operating cash flow minus capex) is around €2.6 bn, sufficient to service hybrid coupons and maintain dividend payments.

**Business stability**  
Naturgy is a large, integrated Spanish energy group with regulated distribution assets, providing relatively stable and predictable cash flows—features that rating agencies view favorably for hybrid capital.

**Dividend policy and financial flexibility**  
While the payout ratio is high (~70 % of earnings), the company already pays a dividend and generates strong cash flow, indicating ability to meet hybrid obligations. The equity base (≈€10 bn) and asset base (≈€40 bn) support a subordinated layer of hybrid debt.

**Conclusion**  
Given solid cash‑flow generation, moderate leverage, good interest coverage, and a stable utility business model, Naturgy Energy Group S.A. meets the typical criteria for issuing hybrid bonds. The company appears well‑positioned to add hybrid capital to its structure.

<answer>Strongly Suitable</answer>