I need to analyze whether REDEIA CORPORACION SA should utilize hybrid bonds and to what extent relative to S&P's 15% cap on equity credit for hybrids.

Let me first understand the company's financial position:

**Key Financial Metrics:**

1. **Leverage Analysis:**
   - Total Equity (2023-01-01): €4,894M
   - Total Debt: Long-term borrowings (€5,491M) + Current borrowings (€722M) = ~€6,213M
   - Total adjusted capital (debt + equity) ≈ €6,213M + €4,894M = ~€11,107M
   - Debt/Equity ratio ≈ 1.27x
   - Debt/Capital ≈ 56%

2. **S&P's 15% cap calculation:**
   - 15% of total adjusted capital = 15% × €11,107M ≈ €1,666M
   - This is the maximum hybrid equity credit allowed

3. **Profitability and Cash Flow:**
   - Revenue: €2,015M (2022)
   - EBITDA proxy (Operating profit + D&A): €961M + €545M = ~€1,507M
   - Net income: €681M
   - Operating cash flows: €1,567M
   - FFO is strong relative to debt

4. **Interest Coverage:**
   - EBITDA/Interest ≈ €1,507M / €116M ≈ 13x - very comfortable

5. **Business Profile:**
   - REDEIA is Spain's transmission system operator (Red Eléctrica) - a regulated utility
   - Highly predictable, regulated cash flows
   - Low business risk profile typical of transmission utilities

**Assessment for hybrid bond utilization:**

**Arguments for utilizing hybrids:**
- Regulated utility with stable, predictable cash flows - good candidate for hybrids
- The company has significant debt (~56% of capital) and hybrids could help optimize the capital structure
- Interest rates rose significantly in 2022 (swap curves went from negative to ~1.7-1.9%), making capital structure optimization important
- Credit spreads (iBoxx EUR Non-Financial IG) widened, so maintaining credit quality is valuable
- The company already has substantial leverage; hybrid equity credit could help maintain/improve credit ratings

**Arguments against full utilization:**
- The company already has strong interest coverage (~13x)
- Strong operating cash flows relative to debt
- The company recently raised equity (significant increase in reserves from ~€2,990M to €4,064M, and proceeds from sale of treasury shares of €1,001M)
- With recent equity issuance, the immediate need for hybrid equity credit may be reduced

**Moderate utilization reasoning:**
- As a regulated utility, REDEIA has a typical profile that benefits from hybrids to optimize cost of capital while maintaining investment-grade ratings
- The leverage is moderate but not extreme for a utility
- The recent equity raise suggests management is conscious of capital structure
- However, the stable regulated business model and predictable cash flows make it a good candidate for some hybrid utilization
- Utilities commonly use hybrids but don't always max out the cap

Given that REDEIA is a regulated utility with moderate leverage, stable cash flows, and recently strengthened its equity base, I would expect it to utilize hybrids at a moderate level - not zero (since regulated utilities commonly benefit from hybrids) but perhaps not at full capacity given the recent equity strengthening. A 50% utilization seems appropriate - the company benefits from hybrid issuance for capital structure optimization but doesn't need to maximize it given its already reasonable financial profile and recent equity actions.

<answer>50%</answer>