Reasoning:

- **Entity A: TenneT Holding B.V.** is the most compelling first target. It already has a sizeable **hybrid capital** balance of **2.125bn**, showing the issuer is familiar with and willing to use hybrid instruments. It is also highly capital-intensive, with major grid investment needs: PPE rose from **23.8bn to 26.8bn**, capex was **4.4bn**, and long-term borrowings increased sharply from **12.4bn to 19.0bn**. Although profitability was negative in 2022, the entity is a regulated transmission system operator owned by the **Dutch State**, which supports credit quality and market access. The combination of existing hybrid usage, heavy funding needs, and likely balance-sheet support makes A the strongest hybrid-origination prospect.

- **Entity C: ENGIE** should be second. ENGIE also already has hybrid-like capital outstanding via **deeply subordinated perpetual notes**, though this balance declined from **3.767bn to 3.393bn**, indicating prior access to the hybrid market and potential refinancing or capital-structure management opportunities. ENGIE is very large, investment-heavy, and has substantial debt, but 2022 earnings were weaker and equity attributable to owners declined. Still, its scale, established capital markets profile, and existing hybrid stock make it a credible prospect.

- **Entity B: REDEIA CORPORACION SA** ranks third. It is financially solid and profitable, with stable regulated infrastructure cash flows, but there is no evidence in the data of existing hybrid capital. Its leverage appears more moderate than A’s, equity increased significantly, and financing cash flow was negative in 2022, suggesting less immediate pressure to raise hybrid capital. It may still be a good issuer, but relative to A and C it is less obviously in need of, or accustomed to, hybrid issuance.

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