To determine the order of suitability for a hybrid bond issuance, we evaluate the three entities—TenneT Holding B.V. (A), Redeia Corporacion SA (B), and ENGIE (C)—based on their business profiles and financial standing as of December 31, 2022.

1.  **Entity A (TenneT Holding B.V.):** TenneT is a transmission system operator (TSO) operating in the Netherlands and Germany. This is a highly regulated, infrastructure-heavy business with very stable and predictable cash flows. The entity faces massive capital expenditure requirements to support the energy transition, and its operating cash flows are currently insufficient to cover these, necessitating significant external funding. Its leverage has increased significantly (Long-term borrowings grew from 12.3B to 19.0B EUR). Given its status as a critical utility/infrastructure provider with a need to preserve its credit rating for capital-intensive infrastructure projects, it fits the "Strongly Suitable" profile perfectly. It has a high rationale for hybrid issuance to improve its leverage metrics while maintaining credit quality.

2.  **Entity C (ENGIE):** ENGIE is a large-scale, diversified energy and infrastructure company. While it has significant infrastructure assets (networks, renewables), it is also involved in more volatile segments like energy supply and commodity trading. Its scale is much larger than A or B, but its leverage and business risk profile are more complex. ENGIE has a history of active capital management and is well-positioned for "Strongly Suitable" status, but its diversified profile and existing active capital structure management make it slightly less urgent or "pure" in its infrastructure-like profile compared to a dedicated TSO like TenneT.

3.  **Entity B (Redeia Corporacion SA):** Formerly Red Eléctrica, it is a Spanish TSO. Like TenneT, it is a regulated infrastructure entity. However, looking at the financial data provided, REDEIA has been reducing its debt levels (Non-current financial liabilities decreased from 5.95B to 5.54B EUR) and maintains a stable financial position. Its issuance would be more opportunistic or for general corporate purposes rather than an urgent necessity driven by deteriorating metrics or massive, imminent infrastructure funding gaps. This aligns it with the "Marginally Suitable" category as an opportunistic issuer.

**Conclusion:** TenneT (A) is the most urgent candidate for a hybrid due to its infrastructure mandate and leverage pressure. ENGIE (C) is a strong candidate given its scale and energy transition strategy. Redeia (B) is the most stable and least pressured, placing it last.

<answer>A,C,B</answer>