I'll analyze IBERDROLA SA's financial position and determine the appropriate hybrid bond issuance level. Let me work through this systematically.

## Step 1: Identify Current Hybrid/Equity-Like Instruments in Capital Structure

From the data, I can identify existing hybrid-like instruments:
- "Instrumentos De Capital Con Caracteristicas De Pasivo Financiero No Corriente" (Noncurrent): €576M (2023-01-01), €525M (2022-01-01)
- "Instrumentos De Capital Con Caracteristicas De Pasivo Financiero Corriente" (Current): €87M (2023-01-01), €100M (2022-01-01)

Total existing hybrid capital: €576M + €87M = **€663M** as of 2023-01-01

Also relevant: "Emision De Obligaciones Perpetuas Subordinadas" (subordinated perpetual bonds) - €2,740M issued in 2021-2022 period, with interest payments of €169M.

## Step 2: Calculate Total Adjusted Capital and Current Metrics

**Equity:** €58,114M (2023-01-01)
- Equity attributable to owners: €41,119M
- Noncontrolling interests: €16,995M

**Debt components:**
- Noncurrent financial liabilities: €44,216M
- Current financial liabilities: €25,079M
- Total financial liabilities: €69,295M

Breaking down financial liabilities:
- Debt with credit institutions/bonds (noncurrent): €36,129M
- Debt with credit institutions/bonds (current): €10,458M
- Total debt with credit institutions/bonds: €46,587M

**Total Adjusted Capital** = Equity + Adjusted Debt = €58,114M + €69,295M = **€127,409M**

Current hybrid as % of total adjusted capital: €663M / €127,409M = **0.52%**

## Step 3: Analyze Financial Position and Rating Drivers

### Leverage Metrics (approximate):
- Total Liabilities / Total Assets: (154,667 - 58,114) / 154,667 = €96,553M / €154,667M = 62.4%
- Debt/Equity: €69,295M / €58,114M = 1.19x
- Net debt (approx): €69,295M - €4,608M cash = €64,687M
- Net debt / EBITDA: €64,687M / €13,228M = 4.9x

### Key Financial Characteristics:
- **Revenue growth**: €39.1B (2021) → €53.9B (2022), significant increase
- **EBITDA**: €12.0B → €13.2B (10% growth)
- **Profit attributable to owners**: €3.9B → €4.3B
- **Operating cash flow**: €10.4B (strong generation)
- **Capex intensity**: €6.3B property/equipment purchases + €0.5B intangibles + construction in progress growth = significant infrastructure investment

### Business Profile Assessment:
IBERDROLA is a **diversified utility** with operations spanning:
- Regulated utilities (networks, distribution)
- Unregulated power generation (renewables focus)
- International operations (geographic diversity)

From the methodology, this is primarily a **regulated utility** with significant **unregulated/renewable generation** components.

### Regulatory Advantage Considerations:
- Spanish/UK/Brazilian/US regulatory jurisdictions
- Generally supportive regulatory frameworks for renewables transition
- Strong track record of regulatory cost recovery

### Scale, Scope, Diversity:
- Very large scale (€154.7B assets, €53.9B revenue)
- Geographic diversification across multiple countries
- Diverse generation mix with renewables focus

## Step 4: Assess Funding Needs and Strategic Position

### Capital Intensity:
- Construction in progress: €11.5B (up from €9.1B) - **26% increase**
- PPE growth: €86.3B from €80.0B - significant ongoing investment
- **Energy transition capex**: IBERDROLA has announced massive renewable investment programs

### Refinancing Needs:
- Current portion of long-term debt: €10.5B
- Total debt maturities in near term: manageable but material

### Rating Context:
- IBERDROLA is typically rated BBB+/A- range
- Strong investment grade profile but with pressure from energy transition capex

### Market Conditions (2022):
- Swap curves turned sharply positive (5Y: 1.726%, 10Y: 1.927%)
- Corporate bond spreads: iShares Core Euro Corp Bond at 1.085%
- Sub-senior delta: 0.2% additional for non-financial IG

**Cost of hybrid issuance**: In 2022 rising rate environment, hybrid costs would be higher than historical but still potentially attractive for equity credit treatment.

## Step 5: Match to Guidance Framework

Let me evaluate against the checklist:

| Factor | Assessment | Points toward |
|--------|-----------|-------------|
| Capex intensity | **HIGH** - €11.5B construction in progress, 26% growth, energy transition | Higher hybrid % |
| Refinancing needs | Moderate - €10.5B current maturities | Moderate |
| Rating headroom | Moderately constrained by capex trajectory | Higher hybrid % |
| Current hybrid outstanding | Minimal (€663M = 0.52%) | Room to add |
| Leverage optimization | Meaningful improvement possible | 7.5-11.25% |
| Cost of hybrid vs debt | Marginal increase in rising rate environment | 11.25% range |
| Investment grade preservation | Important for utility funding access | 11.25% |

### Detailed Analysis:

**Against 7.5% criteria:**
- Moderate refinancing needs? ✓ (some, but not crisis level)
- Rating headroom moderately constrained? ✓ (capex pressure is real)
- Meaningfully improves leverage? ✓ (would reduce reported leverage)
- Cost slightly increases debt? Partial (in 2022 environment, more than slight)

**Against 11.25% criteria:**
- High capex intensity? ✓✓ (€11.5B CIP, massive renewable program)
- Significant leverage pressure? ✓ (energy transition is capital intensive)
- IG preservation dependent on optimization? Partial (not immediately threatened, but trajectory matters)
- Cost marginal impact? In 2022, hybrid costs rose but still below equity cost

**Key distinguishing factors:**
- IBERDROLA has a **transformational energy transition program** (renewables, grids, storage)
- The company is in **active growth mode** with construction in progress up 26%
- However, it has **strong cash flow generation** (€10.4B operating cash flow)
- **Current hybrid usage is minimal** (0.52%), suggesting untapped capacity

## Step 6: Final Determination

The critical factors pushing toward **11.25%**:
1. **Extraordinary capex intensity**: The 26% growth in construction in progress and IBERDROLA's stated €75B+ investment plan through 2025
2. **Energy transition is transformational**, not maintenance
3. **Leverage trajectory management**: With net debt/EBITDA near 5x, optimizing capital structure is important
4. **Current minimal hybrid usage**: Only 0.52% of capital, far below 15% cap
5. **Rating preservation**: IBERDROLA needs to maintain strong IG rating for low-cost funding of transition

However, factors suggesting **7.5%** might suffice:
- Strong operating cash flow generation (€10.4B)
- No immediate refinancing crisis
- Not at immediate downgrade risk

The decisive factor is the **scale and transformational nature of IBERDROLA's investment program**. This is not "moderate" capex—it's a fundamental business transformation requiring massive capital deployment. The company needs maximum financial flexibility to execute its strategy while preserving its credit rating.

The 2022 rising rate environment also means hybrid costs, while higher than 2020-2021, are still attractive relative to equity and provide valuable rating agency equity credit.

Given IBERDROLA's:
- Minimal current hybrid usage (0.52%)
- Massive growth capex program
- Need to preserve IG rating for low-cost transition funding
- Strong but leveraged financial position

The optimal recommendation is **11.25%** of total adjusted capital, which would represent approximately €14.3B of hybrid capacity. However, given the annual issuance cap of €3B, this would be phased over several years.

Actually, let me reconsider: With €127.4B total adjusted capital, 11.25% = €14.3B maximum hybrid capacity. At €3B/year, this would take ~5 years to reach, which aligns with IBERDROLA's stated investment horizon.

But the question asks for utilization in the **next 18 months**. With €3B/year cap, maximum issuance is €4.5B in 18 months. As % of total adjusted capital: €4.5B / €127.4B = 3.5%.

However, the question asks "to what extent should this company utilize hybrid bonds"—the target level, not necessarily immediate issuance. Given the strategic need for capital structure optimization with transformational capex, targeting 11.25% makes sense as a strategic objective, with 7.5% as a more conservative near-term target.

Re-reading: The options are discrete levels representing the recommended utilization level. Given IBERDROLA's position—strong but with transformational capex needs, moderate leverage pressure, and need for rating flexibility—**11.25%** best captures the strategic imperative.

<answer>11.25%</answer>