I need to analyze whether REDEIA CORPORACION SA should utilize hybrid bonds up to S&P Global Ratings' 15% cap on equity credit from hybrids relative to total adjusted capital.

Let me first understand the company's capital structure and financial position.

## Step 1: Calculate Total Adjusted Capital and Current Equity/Debt Mix

From the balance sheet (2023-01-01):
- Total Equity: 4,894,276,000 EUR
- Total Assets: 14,781,520,000 EUR

Total Liabilities = Assets - Equity = 14,781,520,000 - 4,894,276,000 = 9,887,244,000 EUR

Let me break down debt:
- Noncurrent Financial Liabilities: 5,543,755,000 EUR
- Current Financial Liabilities: 1,705,277,000 EUR
- Total Financial Debt: ~7,249,032,000 EUR

Other liabilities:
- Noncurrent Liabilities (total): 6,984,202,000 EUR (includes grants, provisions, deferred tax, etc.)
- Current Liabilities (total): 2,903,042,000 EUR

Total Adjusted Capital = Debt + Equity. I need to focus on debt-like liabilities for S&P purposes.

For S&P's hybrid bond analysis, "total adjusted capital" typically means debt plus equity, where debt includes all interest-bearing obligations.

From the data:
- Long-term Borrowings: 5,491,124,000 EUR
- Current Borrowings and Current Portion of Noncurrent Borrowings: 721,845,000 EUR
- Other Noncurrent Financial Liabilities: 52,631,000 EUR
- Other Current Financial Liabilities: 983,432,000 EUR

Total interest-bearing debt ≈ 5,491,124,000 + 721,845,000 + 52,631,000 + 983,432,000 = 7,249,032,000 EUR

Total Adjusted Capital = 7,249,032,000 + 4,894,276,000 = 12,143,308,000 EUR

## Step 2: Analyze the Company's Financial Profile

**Leverage Metrics:**
- Debt/Equity ratio: 7,249,032,000 / 4,894,276,000 = 1.48x
- Debt/Total Capital: 7,249,032,000 / 12,143,308,000 = 59.7%

**Credit Quality Indicators:**
- The company has significant debt but also stable infrastructure-like assets (property, plant & equipment of 9.6B EUR)
- Interest coverage: Operating profit 961,554,000 / Finance Costs 116,468,000 = 8.25x (strong)
- Strong cash flow from operations: 1,566,829,000 EUR

## Step 3: Assess Hybrid Bond Suitability

**Factors favoring hybrid bonds:**
1. **Stable, predictable cash flows**: The company operates in the electricity transmission sector (implied by "Red Eléctrica" = Spanish grid operator), which is regulated, essential infrastructure with stable revenues
2. **Strong interest coverage** (~8x) provides comfort for coupon payments
3. **High tangible asset base** (PPE of 9.6B EUR) provides security
4. **Investment-grade profile likely**: Strong operational metrics suggest IG rating

**Factors to consider:**
1. **Current leverage is already moderate-high** at ~60% debt/capital
2. **Rising interest rate environment** (2022 swap curves show significant increases from 2020-2021)
3. **Need for financial flexibility**: The company has been investing significantly (negative investing cash flows of 1.6B EUR in 2022)

## Step 4: Market Context for Hybrid Issuance

The swap curves show dramatically rising rates in 2022:
- 10Y swaps went from -0.143% (2020) to 1.927% (2022)
- This makes fixed-rate hybrid bonds more expensive to issue

However, the iShares Core Euro Corp Bond and IBOXX EUR Non-Financial IG spreads suggest:
- IG corporate bond yields in 2022: ~2.3-2.5% for non-financial IG
- Hybrid bonds typically trade at a premium to straight debt

## Step 5: Strategic Assessment for 15% Cap Utilization

S&P's 15% cap on equity credit from hybrids is a maximum, not a target. The question asks what extent the company *should* utilize this capacity.

**Arguments for full (100%) utilization of the 15% cap:**
- The company has a regulated utility profile with extremely stable cash flows - ideal for hybrid bonds
- Strong interest coverage provides headroom for the higher coupons
- Infrastructure companies are natural hybrid issuers due to long-dated, stable assets
- Equity credit from hybrids improves leverage metrics without diluting shareholders

**Arguments against full utilization:**
- Already at ~60% leverage; adding more debt-like instruments increases financial risk
- Rising rate environment makes coupons expensive
- The company reduced financial debt in 2022 (noncurrent financial liabilities decreased from 5.95B to 5.54B), suggesting deleveraging preference

**Key insight**: The company is a regulated grid operator with:
- Very stable, predictable cash flows
- Long-duration tangible assets (PPE >9B EUR)
- Strong interest coverage
- Essential service nature

This profile is **ideal for hybrid bonds** - the stability supports the higher coupon, and the long assets match the perpetual/perpetual-like nature of hybrids.

However, looking at the 2022 deleveraging trend and the significant rise in interest rates, being **moderate** in hybrid utilization makes sense.

## Step 6: Optimal Utilization Level

Given:
- Strong credit fundamentals but rising rate environment
- Ideal issuer profile for hybrids (regulated utility)
- Already moderate leverage
- Need to maintain financial flexibility

**75% utilization** of the 15% cap seems optimal because:
- It provides meaningful equity credit benefit without maxing out capacity
- Leaves 25% headroom for future needs or stress scenarios
- Balances the strong issuer profile with the rising cost of debt
- For a company with this stability, going below 50% would underutilize a valuable tool; going to 100% leaves no buffer

However, looking more carefully: the company has been deleveraging and has strong cash generation. For a regulated utility with this profile, **50%** might be more appropriate as it:
- Provides meaningful diversification of capital structure
- Doesn't over-commit in a rising rate environment
- Maintains significant flexibility

But actually, for a core infrastructure utility with 8x interest coverage and regulated revenues, the risk of hybrids is low. The 15% cap is conservative by S&P. **75%** allows substantial benefit while preserving buffer.

Given the rising rate environment in 2022 specifically, and the company's deleveraging trend, I think **50%** is the most balanced answer - using hybrids meaningfully but not aggressively in an environment where debt is becoming more expensive.

<answer>50%</answer>