I need to analyze ENGIE's capital structure and determine how much they should utilize hybrid bonds relative to S&P Global Ratings' 15% cap on equity credit from hybrids.

First, let me identify the key components from the balance sheet:

**Equity (2023-01-01):**
- Equity Attributable To Owners Of Parent: €34,253,000,000
- Noncontrolling Interests: €5,032,000,000
- **Total Equity: €39,285,000,000**

**Debt (2023-01-01):**
- Long-term Borrowings: €28,083,000,000
- Current Borrowings And Current Portion Of Noncurrent Borrowings: €12,508,000,000
- **Total Debt: €40,591,000,000**

**Total Adjusted Capital = Debt + Equity = €40,591M + €39,285M = €79,876M**

**S&P's 15% Cap on Hybrid Equity Credit:**
- Maximum equity credit from hybrids = 15% × €79,876M = €11,981M

Now let me look at ENGIE's actual hybrid capital structure. From the equity section, I can see:

**Deeply Subordinated Perpetual Notes (2023-01-01): €3,393,000,000**
**Deeply Subordinated Perpetual Notes (2022-01-01): €3,767,000,000**

These are the hybrid instruments. Let me verify this is indeed hybrid capital by checking the 2021 starting position and movements:

From 2022-01-01 to 2023-01-01:
- Operations On Deeply Subordinated Perpetual Notes: -€451M total (€-374M to the notes, €-77M to retained earnings)

This confirms these are hybrid instruments that are being amortized/redeemed.

**Current Hybrid Capital as % of Total Adjusted Capital:**
€3,393M / €79,876M = 4.25%

**Current Hybrid Capital as % of S&P's 15% Cap:**
€3,393M / €11,981M = 28.3% of the cap used

However, the question asks "to what extent should this company utilize hybrid bonds relative to S&P Global Ratings' cap" - meaning what percentage of the 15% cap should they use?

Let me analyze ENGIE's financial profile to determine optimal hybrid usage:

1. **Credit Profile Considerations:**
   - ENGIE is a large utility with stable, regulated cash flows
   - Utilities are typically capital-intensive with stable cash flows, making them good candidates for hybrid financing
   - The company has significant derivative exposures (both assets and liabilities), indicating commodity trading/hedging activities

2. **Current Financial Metrics:**
   - Debt/Equity ratio: €40,591M / €39,285M = 1.03x
   - This is moderate leverage for a utility

3. **Interest Rate Environment (2022 data):**
   - Swap rates turned positive in 2022 after years of negative rates
   - 5Y: 1.726%, 7Y: 1.806%, 10Y: 1.927%
   - Corporate bond spreads: iShares Core Euro Corp Bond at 1.085%, Sub-senior at 2.295%
   - Rising rate environment makes fixed-rate hybrid coupons more attractive to lock in

4. **Current Hybrid Usage vs. Optimal:**
   - Currently at ~4.25% of total adjusted capital, well below the 15% cap
   - The 15% cap is a maximum, not a target
   - S&P typically allows 50% equity credit treatment for hybrids (i.e., 50% of hybrid amount counts as equity)

5. **Utility Sector Norms:**
   - European utilities typically use hybrids moderately
   - Too much hybrid usage can signal financial stress or be viewed negatively
   - Hybrids are more expensive than senior debt but cheaper than equity

6. **ENGIE's Specific Situation:**
   - The company has been reducing hybrids (from €3,767M to €3,393M)
   - Profitability was weak in 2022 (€390M net profit vs €3,758M prior year)
   - Significant discontinued operations gains (€2,183M) suggest portfolio restructuring
   - Operating performance was challenged (current operating income down from €6,116M to €4,309M)

Given:
- Stable utility cash flows support some hybrid usage
- Moderate current leverage
- Rising interest rates make new hybrid issuance less attractive (higher coupons)
- Company is already reducing hybrid exposure
- Weak 2022 earnings suggest conservative approach warranted
- S&P's 15% is a cap, not a target - most utilities use significantly less

For a conservative, investment-grade utility with stable cash flows but currently challenged earnings, typical optimal hybrid usage would be in the **50-75%** range of the cap. However, given:
- ENGIE is actively reducing hybrids
- Rising rate environment
- Earnings volatility from commodity exposures
- The 15% cap is quite generous relative to what most utilities actually use

A **50%** utilization of the cap would mean hybrids at ~7.5% of total adjusted capital, or roughly €6B - which would be a moderate increase from current levels and appropriate for a utility with stable underlying cash flows but some earnings volatility.

However, looking more carefully at market practice and ENGIE's conservative trajectory (reducing hybrids), and considering that the 15% cap is a maximum that most investment-grade companies don't approach, **25%** or **50%** would be most reasonable.

Given the stable utility business model, the need for financial flexibility, and the fact that ENGIE has historically used hybrids (just at lower levels), utilizing **50%** of the S&P cap would be appropriate - this provides equity-like credit benefit without excessive reliance on expensive hybrid capital.

<answer>50%</answer>