I need to analyze TenneT Holding B.V.'s financial position to determine the appropriate hybrid bond issuance level. Let me work through this systematically.

## Key Financial Data Analysis

### Current Capital Structure (as of 2023-01-01)
- **Ordinary Equity**: €5,133M
- **Hybrid Capital (existing)**: €2,125M
- **Total Equity Attributable to Owners**: €7,258M
- **Noncontrolling Interests**: €455M
- **Total Equity**: €7,713M

### Debt Position
- **Long-term Borrowings**: €19,006M
- **Short-term Borrowings**: €709M
- **Other Noncurrent Financial Liabilities**: €185M
- **Other Current Financial Liabilities**: €550M
- **Current Bank Overdrafts**: €0
- **Lease Liabilities (current + noncurrent)**: €155M + €574M = €729M

Total adjusted debt ≈ €20,450M (borrowings + financial liabilities, excluding leases which are already in right-of-use assets)

### Total Adjusted Capital
Total adjusted capital = Equity + Adjusted Debt ≈ €7,713M + €20,450M = €28,163M

**Current hybrid as % of total adjusted capital**: €2,125M / €28,163M = **7.5%**

### Financial Performance (2022)
- **Revenue**: €8,299M (up 50% from €5,524M)
- **Operating Loss**: €-976M (worsened from €-275M)
- **Net Loss**: €-879M (worsened from €-340M)
- **Profit Loss Attributable to Ordinary Equity Holders**: €-967M

### Cash Flow and Capex Intensity
- **Operating Cash Flow**: €1,196M
- **Investing Cash Flow (capex)**: €-4,345M
- **Purchase of PPE/Intangibles**: €4,424M (up from €3,711M)
- **Financing Cash Flow**: €6,556M (heavy reliance on borrowing)

**Capex/Revenue ratio**: €4,424M / €8,299M = **53%** - extremely high capex intensity

### Balance Sheet Growth
- Total assets grew from €31,200M to €38,509M (**23.4% growth**)
- Long-term borrowings grew from €12,366M to €19,006M (**53.7% increase**)
- Cash increased significantly from €3,204M to €6,547M

### Key Observations

1. **Extraordinary Capex Needs**: The company is in massive expansion mode with €4.4B annual capex (53% of revenue), up from €3.7B prior year. This is transformational infrastructure investment.

2. **Negative Profitability**: Operating and net losses are deepening, not improving. The company is burning cash at the operational level.

3. **Heavy Reliance on External Financing**: Net financing of €5,999M needed, with €7,338M in new borrowings. The company is highly dependent on debt markets.

4. **Already Has Hybrid Capital**: €2,125M already outstanding, representing ~7.5% of total adjusted capital.

5. **Regulated Utility Characteristics**: As a transmission system operator (TSO) owned by the Dutch State, TenneT benefits from regulated cost recovery but faces massive grid expansion needs for energy transition.

6. **Rating Considerations**: The deteriorating metrics, negative earnings, and massive capex program suggest significant leverage pressure. Hybrid issuance would help stabilize credit metrics.

7. **Cost Environment**: Rising interest rate environment (swap curves turned positive in 2022 after negative rates), but hybrid costs likely still manageable given regulated utility status and state ownership.

### Assessment Against Guidelines

| Factor | Assessment |
|--------|-----------|
| Refinancing needs | High - massive capex program |
| Capex intensity | Very high - 53% of revenue, growing |
| Leverage pressure | Significant - debt growing 54% YoY |
| Rating preservation | Important - regulated utility, state-owned |
| Current hybrid level | Already at 7.5% |
| Cost impact | Marginal - state-owned regulated utility |

The company exhibits:
- **Very high capex intensity**: €4.4B annually and growing
- **Significant leverage pressure**: Debt increasing rapidly to fund expansion
- **Negative earnings trajectory**: Losses deepening
- **Strategic importance**: State-owned TSO critical for energy transition

However, the company **already has €2,125M in hybrid capital at 7.5% of total adjusted capital**. The question asks about additional issuance in the next 18 months.

Given:
- Maximum per year: €3B
- Current level: 7.5%
- Maximum allowed: 15%

The company could potentially add another ~€2.1B to reach 15%, but annual issuance is capped at €3B.

Considering the **massive capex needs** (€4.4B+ annually), **deteriorating earnings**, **heavy debt reliance**, and the **energy transition imperative** (grid expansion is critical), the company has strong rationale to maximize hybrid capacity.

However, the company is **already at 7.5%**. Moving to **11.25%** would mean adding ~€1.05B of hybrid capital (within the €3B annual limit), which would:
- Provide meaningful additional equity credit
- Help stabilize leverage metrics during this transformational capex phase
- Not be excessive given the strategic context

Moving to **15%** would require ~€2.1B additional, which while possible within the €3B limit, may be aggressive given the already elevated leverage and negative earnings.

The **11.25%** level fits best because:
- Capex is very high and growing
- Leverage pressure is significant (debt up 54%)
- Investment grade preservation is important for a state-owned strategic utility
- The cost impact would be marginal given regulated cost recovery
- It provides meaningful additional capacity without maxing out
- The company already uses hybrids successfully (7.5%)

<answer>11.25%</answer>