## Reasoning

Let me analyze EDF's financial situation and capital structure to determine the appropriate reliance on hybrid bonds.

### Financial Health Assessment

**Profitability:** EDF reported a massive net loss of €18.2 billion in 2022, compared to a profit of €4.8 billion in 2021. The operating profit before D&A was -€5.0 billion vs. +€18.0 billion the prior year. This was driven primarily by a massive increase in fuel/energy/transmission charges (€121B vs €44.3B) while revenue grew significantly but not enough (€143.5B vs €84.5B).

**Leverage:** Total equity dropped from €62.0B to €46.6B. Total assets are €388.1B, meaning the equity ratio is only about 12%. Non-current financial liabilities are €71.1B and current financial liabilities are €71.8B - substantial debt levels.

**Cash Flow:** Operating cash flows were deeply negative at -€7.4B (vs +€12.6B in 2021). The company had to raise €34.2B in new borrowings and €3.3B in equity issuances.

**Nuclear provisions:** €56B in nuclear-related provisions represent a massive long-term liability.

### Capital Structure Considerations

**Existing hybrid usage:** The data shows EDF already uses perpetual subordinated bonds (hybrid instruments). There are payments to holders of perpetual subordinated bonds (€606M in 2022), and issuance/redemption of perpetual subordinated bonds and convertible instruments (€994M proceeds in 2022). In the equity statement, there are entries for "Payments On Perpetual Subordinated Bonds" and "Issuance And Redemption Of Perpetual Subordinated Bonds And Convertible Instruments" (-€1,025M net in equity).

**Why hybrids make sense for EDF:**
1. **State-owned utility with investment-grade aspirations:** EDF is majority state-owned and needs to maintain investment-grade ratings. Hybrid bonds receive partial equity credit from rating agencies (typically 50%), helping maintain credit metrics.
2. **Massive capital needs:** Nuclear fleet maintenance, new builds (Hinkley Point C, Sizewell C), and renewable energy investments require enormous capital.
3. **Tax efficiency:** Unlike pure equity, hybrid bond coupons are typically tax-deductible.
4. **Maintaining leverage ratios:** Given the deteriorating balance sheet, hybrids provide a middle ground between dilutive equity and additional senior debt.

**Why not 100% hybrids:**
- Hybrid bonds are more expensive than senior debt (the sub-sen delta shows ~20bps additional spread)
- Rating agencies only give partial equity credit
- In times of stress (like 2022), the company still needs real equity and senior debt
- The company actually raised significant senior debt (€34.2B) and equity (€3.3B) in 2022

**Why not 0%:**
- EDF already actively uses hybrids
- Given the enormous capital needs and desire to balance credit metrics, hybrids are a natural fit for a utility of this scale
- The massive losses and declining equity make hybrid bonds an important tool

**Appropriate level:** EDF is a classic case where hybrid bonds play an important but not dominant role in the capital structure. They're a complement to senior debt and equity. Looking at the actual usage - hybrid-related transactions are in the low single-digit billions compared to tens of billions in senior debt and several billion in equity. Hybrids likely represent a meaningful but moderate portion of the optimal capital structure. Given the severe financial stress, massive investment needs, and the utility's characteristics, a moderate allocation of ~25% seems appropriate - enough to benefit from the equity credit and tax advantages, but not so much as to over-rely on an instrument that is more expensive than senior debt and provides only partial equity credit.

<answer>25%</answer>