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

## Key Financial Analysis

### Current Hybrid Position
- ENGIE has issued hybrid bonds previously (first issuance in 2014, and issued in 2021/2022)
- Current "Deeply Subordinated Perpetual Notes" (hybrids) in equity: €3,393M (2023) / €3,767M (2022) / €3,913M (2021)
- This represents approximately 8.6% of total equity (€39.3B) or roughly 3.4% of total adjusted capital

### Credit Metrics (S&P adjusted)
- S&P Net Debt / EBITDA for 2022: **3.25x**
- S&P FFO / Net Debt for 2022: **0.2483** (approximately 24.8%)
- Moody's adjusted leverage trend: **Improving**

### Financial Profile Assessment

**Profitability and Cash Flow:**
- Revenue increased significantly from €57.9B to €93.9B (62% increase)
- However, current operating income declined from €6.1B to €4.3B
- Net income dropped dramatically: from €3.8B to €0.39B
- Continuing operations actually lost €1.8B in 2022
- Discontinued operations contributed €2.2B (one-time boost)

**Capital Structure:**
- Total equity: €39.3B (down from €42.0B in 2022)
- Total debt (long-term + current borrowings): ~€40.6B
- Total assets: €235.5B
- Equity ratio: ~16.7% (relatively low)

**Cash Flow Generation:**
- Operating cash flow: €8.6B (improved from €7.3B)
- Free cash flow situation: Capex of €6.4B on PPE/intangibles
- Dividend payments: €2.6B (continuing to pay substantial dividends despite weak earnings)

**Refinancing and Market Conditions:**
- Long-term borrowings decreased from €30.5B to €28.1B
- Current borrowings increased from €10.6B to €12.5B
- Interest costs nearly doubled: from €2.1B to €3.7B (reflecting rising rate environment)

### Rating and Leverage Considerations

The S&P Net Debt/EBITDA of 3.25x and FFO/Net Debt of ~25% suggest:
- This is in the **BBB range** for utilities (not "A" range)
- Metrics are **moderately constrained** but not distressed
- Moody's notes "improving" trend, suggesting some stabilization

### Hybrid Bond Cost Consideration

Looking at market data:
- Swap curves 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: ~2.3% average in 2022

Given the rising rate environment in 2022, hybrid costs would have increased but the delta to senior debt may have compressed somewhat. The cost of hybrids would likely be **moderately higher** than historical costs but not prohibitively expensive.

### Strategic Assessment

**Arguments for moderate hybrid issuance (7.5%):**
- ENGIE is a complex, capital-intensive utility with significant infrastructure needs
- The energy transition requires substantial capex (renewables, grids, etc.)
- Current leverage at 3.25x Net Debt/EBITDA provides some headroom but not abundant
- FFO/Net Debt of ~25% is adequate but not strong for a BBB utility
- The company has demonstrated willingness to use hybrids (continuous presence since 2014)

**Arguments against higher issuance (11.25%-15%):**
- Moody's trend is "improving" - not deteriorating
- No immediate material downgrade risk
- No transformational M&A announced
- Operating cash flow is positive and improving
- The company already has hybrids in structure (~3.4% of adjusted capital currently)

**Arguments against lower issuance (0%-3.75%):**
- Not in "A" rating range (would need ~2.5x or lower Net Debt/EBITDA)
- Capex needs are ongoing and substantial
- Rating headroom is moderately constrained at 3.25x
- Energy transition investments will continue

### Conclusion

ENGIE fits the **7.5%** profile most appropriately:
- Moderate refinancing and capex needs (energy transition)
- Rating headroom is **moderately constrained** at 3.25x Net Debt/EBITDA
- Hybrid issuance would **meaningfully improve** adjusted leverage metrics (equity credit treatment)
- Cost of hybrid would **slightly increase** current cost of debt (rising rate environment but utility credit quality is stable)
- Previous hybrid usage demonstrates comfort with instrument, but current levels are modest enough to allow increase
- Not in distress (no need for 11.25%-15%), but not strong enough to ignore capital structure optimization (no need to stay at 0%-3.75%)

The company has used hybrids before but at relatively modest levels. Given the improving trend, moderate leverage pressure from energy transition capex, and the utility of equity credit for rating management, expanding to around 7.5% of total adjusted capital would provide meaningful flexibility without over-reliance on this expensive capital form.

<answer>7.5%</answer>