I need to analyze this company's financial position to determine the appropriate reliance on hybrid bonds in its capital structure.

## Key Analysis

### Company Profile
REN is a Portuguese energy infrastructure company (electricity and gas transmission networks), which is typically:
- Capital intensive with long-lived assets
- Regulated utility with stable, predictable cash flows
- High initial infrastructure investments with long payback periods

### Financial Position Analysis (2022-2023)

**Balance Sheet Strength:**
- Total assets: €6.45 billion (2023) vs €5.59 billion (2022)
- Equity: €1.52 billion (23.5% of assets)
- Total liabilities: €4.93 billion (76.5% of assets)
- Very high leverage ratio

**Debt Structure:**
- Long-term borrowings: €1.70 billion (decreased from €2.39 billion)
- Current borrowings: €0.64 billion (increased from €0.38 billion)
- Total borrowings: ~€2.34 billion

**Special Consideration - Transitional Gas Price Stabilization:**
- Both asset and liability of €1 billion recognized in 2023
- This is a temporary regulatory mechanism, not core business financing

**Cash Flow Characteristics:**
- Operating cash flow: €613 million (strong and positive)
- Investing activities: -€102 million (moderate capex)
- Financing activities: -€546 million (debt repayment and dividends)
- Dividend payments: €145 million (consistent shareholder returns)

**Interest Rate Environment (2022 data):**
- Swap rates turned significantly positive in 2022 (5Y: 1.726%, 7Y: 1.806%, 10Y: 1.927%)
- Corporate bond spreads: ~2.3% for non-financial IG
- Rising rate environment increases debt servicing costs

### Hybrid Bonds Suitability Assessment

**Arguments FOR hybrid bonds:**
1. **Regulated utility profile**: Stable, predictable cash flows support hybrid coupon payments
2. **Long-term assets**: Intangible assets (€4.08 billion) and PPE (€0.13 billion) are long-duration, matching hybrid bond characteristics
3. **High leverage**: Already at ~76% debt-to-assets; equity is expensive to issue; hybrids provide equity-like credit treatment without dilution
4. **Credit rating optimization**: Hybrids receive partial equity credit from rating agencies, improving metrics
5. **Dividend policy**: Company pays consistent dividends (€0.154/share); hybrid coupons are deferrable, providing flexibility

**Arguments AGAINST excessive hybrid reliance:**
1. **Rising interest rate environment (2022)**: Hybrid coupons would reset higher, increasing cost
2. **Regulatory asset base**: Much of the "assets" are intangible concessions; regulatory risk exists
3. **Already high leverage**: Too much hybrid exposure could concern creditors if not balanced
4. **Moderate capex needs**: €102M investing cash flow suggests not massive growth capital needs

### Optimal Hybrid Allocation

For a regulated utility with:
- Stable cash flows ✓
- High existing leverage ✓
- Long-duration assets ✓
- Need for credit optimization ✓

The standard utility sector practice is **25-50%** hybrid bonds as part of debt capital structure.

Given:
- Very high leverage (76.5%) suggests need for equity credit
- But rising rates in 2022 make hybrids more expensive
- The €1B transitional regime is temporary and shouldn't drive permanent capital structure
- Strong operating cash flow (€613M) provides coverage

A **25%** hybrid allocation would:
- Provide meaningful equity credit to improve leverage metrics
- Keep cost of capital reasonable in rising rate environment
- Maintain creditor confidence with balanced structure
- Preserve financial flexibility for regulatory uncertainties

50% would be too aggressive given the rising rate environment and already high leverage. 0% misses the credit optimization opportunity. 75-100% would be excessive for a company already at 76% leverage.

<answer>25%</answer>