To assess whether TenneT Holding B.V. is suitable to issue hybrid bonds, we can analyze several key financial and qualitative indicators from the provided 2022 annual report data:

1. **Existing Hybrid Capital**: The company already has a substantial and established presence in the hybrid bond market, with outstanding "Hybrid Capital" of €2.125 billion as of both Jan 1, 2022, and Jan 1, 2023. This is a definitive sign that the market already accepts and supports its hybrid issuances.
2. **Business Profile and Ownership**: TenneT is a "transmission system operator" (TSO) with its parent entity being the "Dutch State." Grid operators are regulated utilities with highly stable and predictable cash flows, making them classic candidates for hybrid bonds, which rely heavily on long-term credit stability. Furthermore, state ownership often provides an implicit layer of credit support, highly favored by hybrid bond investors. 
3. **Scale and Asset Base**: The company has a massive balance sheet with Total Assets growing from €31.2 billion to €38.5 billion, and revenues of €8.3 billion. Capital-intensive companies of this scale often use hybrid bonds as a vital corporate finance tool to fund huge capital expenditures (Capex in 2022 was €4.4 billion) without deteriorating their senior credit ratings.
4. **Liquidity and Cash Flow**: TenneT holds over €6.5 billion in Cash and Cash Equivalents and generated nearly €1.2 billion in Operating Cash Flows, providing ample liquidity to service the deeply subordinated hybrid debt coupons. 

Because TenneT B.V. is a large, state-owned, regulated utility that already successfully utilizes billions in hybrid capital to fund infrastructure expansion while protecting its senior credit ratings, it represents a prime candidate for this asset class.

<answer>Strongly Suitable</answer>