HERA S.P.A. appears as a regulated utility-like enterprise within Italy (S.p.A., part of Hera Group). Its financials show:

- 2022 revenue of 20.08 billion EUR, robust scale.
- Net debt/EBITDA around 4.23x (S&P), with FFO/debt around 0.1733 (low to mid). Moody's adjusted leverage deteriorating.
- Hybrid issuance history: none to date; first-time issuances would be new.

Assessment against the rubric:

- Business risk profile: The company operates in regulated/infrastructure-adjacent space (utility-like with regulated revenue recovery and capital investments). This aligns with strong regulatory-advantaged, visible cash flows characteristics typical for hybrid use.
- Cash flow visibility: Significant scale, high asset base, and cash flow visibility through regulatory framework, which supports access to institutional capital markets and the appeal of hybrids as a tool to optimize capital structure.
- Ratings headroom and leverage: Current leverage metrics are elevated (S&P debt/EBITDA 4.23x; FFO/debt ~0.17), and Moody's leverage trend worsening. Hybrids could provide some equity-like cushion and improve rating headroom if used prudently, particularly to strengthen FFO/debt and leverage.
- Use of proceeds / funding rationale: If proceeds are directed toward refinancing maturing debt or funding capex in a regulated framework, hybrids can be attractive to maintain investment-grade-like metrics while preserving liquidity.
- Track record: No prior hybrid issuance. The guideline notes that issuing hybrids when none have been issued before is a "strong signal" toward Not Suitable or at best Marginally Suitable. However, the framework also recognizes that regulated/infrastructure players often use hybrids; lack of history is a risk factor.

Given the combination of regulated-infrastructure characteristics and deteriorating leverage metrics, hybrids could be a meaningful tool to improve credit metrics, but the absence of prior hybrid issuance and relatively high leverage imply only a Moderate to cautious case. The guidance suggests a more favorable view if there is a clear plan and rating headroom benefits; otherwise it remains marginal.

Conclusion: Marginally Suitable. 

<answer>Marginally Suitable</answer>