I'll analyze ENEL's financial position and determine the appropriate hybrid bond issuance level based on the provided data and guidelines.

## Key Financial Analysis

### Current Capital Structure and Hybrid Bonds
From the balance sheet data (2023-01-01):
- **Total Equity**: €42,082M
  - Equity attributable to owners: €28,657M
  - Noncontrolling interests: €13,425M
- **Total Liabilities**: €177,536M

**Existing Hybrid Bonds in Capital Structure:**
- "Equity Instruments Perpetual Hybrid Bonds Member" at 2023-01-01: **€5,567M**
- At 2022-01-01: €5,567M
- At 2021-01-01: €2,386M

So ENEL already has **€5,567M in hybrid bonds** outstanding (increased from €2,386M in 2021).

### Calculating Total Adjusted Capital
Total adjusted capital = Equity + Adjusted Debt (where hybrid bonds are treated as 50% equity, 50% debt for S&P purposes, or we can look at total capital)

For S&P's equity credit calculation:
- Total equity: €42,082M
- Hybrid bonds outstanding: €5,567M

Current hybrid as % of total equity = €5,567M / €42,082M = **13.2%**

However, S&P uses "total adjusted capital" = Equity + Adjusted Debt. Looking at the total capital structure:
- Total assets = €219,618M
- Or roughly: Equity (€42,082M) + Debt (~€135,000M estimated from borrowings and other liabilities)

The €5,567M hybrid represents roughly **3.9-4.2%** of total adjusted capital depending on exact debt definition.

### Financial Performance Analysis

**Profitability Trends:**
- 2022 Revenue: €140,517M (vs €85,719M in 2021) - significant increase
- 2022 Operating profit: €11,193M (vs €7,551M in 2021)
- 2022 Net profit: €2,920M (vs €3,857M in 2021) - **declined despite higher revenue**
- Discontinued operations loss in 2022: -€2,298M

**Key Concerns:**
- Net profit declined 24% year-over-year despite 64% revenue growth
- Discontinued operations showing significant losses (-€2,298M)
- Basic EPS dropped from €0.31 to €0.15

**Cash Flow Analysis:**
- Operating cash flow 2022: €8,674M (down from €9,915M in 2021)
- Investing cash flow 2022: -€13,626M (vs -€10,875M in 2021) - **capex increasing**
- Financing cash flow 2022: +€7,369M (vs +€3,931M in 2021) - **increased borrowing**

**Capital Intensity:**
- Purchase of PPE: €11,281M (2022) vs €10,545M (2021)
- Purchase of intangibles: €1,961M (2022) vs €1,656M (2021)
- Total capex trend: **increasing, roughly €14.5B annually**

**Debt and Leverage:**
- Long-term borrowings 2023: €68,191M (up from €54,500M in 2022)
- Short-term borrowings 2023: €18,392M (up from €13,306M in 2022)
- Total borrowings increasing significantly

**Working Capital:**
- Inventories increased: €4,853M (2023) vs €3,109M (2022) - 56% increase
- Trade receivables increased: €16,605M vs €16,076M

### Rating and Strategic Considerations

**ENEL's Profile:**
- Large European utility with operations in Europe and Latin America
- Mix of regulated and unregulated activities
- Significant capex needs (energy transition, grid investments)
- Already has hybrid bonds in structure (€5,567M)

**Market Conditions (2022):**
- Swap rates turned sharply positive in 2022 (5Y: 1.726%, 7Y: 1.806%, 10Y: 1.927%)
- Corporate bond spreads: iShares Core Euro Corp Bond at 1.085%
- Sub-senior delta for non-financial IG: 2.295%

This means **hybrid bond costs have increased significantly** with rising rates, but the absolute level is still manageable.

### Assessment Against Guidelines

| Factor | Assessment | Implication |
|--------|-----------|-------------|
| Refinancing needs | **Moderate to high** - debt increasing, capex heavy | Supports some hybrid issuance |
| Credit metrics | **Moderately constrained** - leverage increasing, ROE declining | Some optimization benefit |
| Rating flexibility | **Useful** - BBB-type profile typical for utilities, needs headroom | Moderate benefit |
| Cost of hybrid | **Slightly above current debt** given rate environment | Marginal cost increase |
| Current hybrids | **Already €5,567M (~3.9-4.2% of adjusted capital)** | Room to add more |
| Capex intensity | **High** - ~€14.5B annually, energy transition spending | Supports higher hybrid usage |

**Key Observations:**
1. ENEL already has hybrid bonds at ~4% of adjusted capital - this suggests the company finds them useful
2. Capex is high and increasing (€14.5B+ annually)
3. Debt levels are rising significantly (+€19B in long-term borrowings year-over-year)
4. Profitability is under pressure from discontinued operations and commodity volatility
5. The company is in a heavy investment phase (energy transition, grid modernization)

However:
- Not in "transformational M&A" mode
- Not facing "material downgrade risk" imminently
- Cost of hybrids has increased with rates
- Already has meaningful hybrid capacity utilized

The profile fits between **7.5% and 11.25%**:
- Higher than 3.75% given the capex intensity and existing hybrid usage
- Not quite 11.25% given no imminent downgrade risk or transformational M&A
- The existing €5,567M needs to be considered as base; adding up to ~€8-9B more would reach higher levels

Given:
- Existing hybrids at ~4%
- Annual issuance capacity up to €3B
- 18-month horizon = up to €4.5B potential new issuance
- This could take total hybrids to ~€10B or ~7-8% of adjusted capital

The **7.5%** level best fits ENEL's profile:
- Moderate refinancing and capex needs (not extreme)
- Rating headroom is moderately constrained
- Meaningful leverage optimization from additional hybrids
- Cost slightly increases but manageable
- Preserves some capacity for future needs without maxing out

Not 11.25% because:
- No "significant leverage pressure" requiring investment grade preservation
- No large acquisition pipeline mentioned
- Cost impact would be more than marginal given rate environment

Not 3.75% because:
- Already at/near that level with existing hybrids
- Would imply no new issuance, contrary to clear utility of the instrument
- Capex needs are genuinely elevated

<answer>7.5%</answer>