I'll analyze ENI S.P.A.'s financial position to determine the appropriate hybrid bond issuance level. Let me work through the key factors systematically.

## Company Profile and Industry Context

ENI is a major integrated oil and gas company (Italian national oil company), operating in E&P, refining, chemicals, and increasingly in energy transition/renewables. Based on the S&P methodology provided, this falls primarily under **Oil and Gas Exploration and Production** with elements of **Unregulated Power and Gas** given its energy transition activities.

## Key Financial Data Extraction (2022 year-end / 2023-01-01 balances)

### Balance Sheet Metrics:
- **Total Assets**: €152.13 billion
- **Total Equity**: €55.23 billion (2023-01-01), up from €44.52 billion (2022-01-01)
- **Total Liabilities**: €96.90 billion
- **Equity Attributable to Owners**: €54.76 billion
- **Noncontrolling Interests**: €0.47 billion

### Debt Structure:
- **Short-term borrowings**: €4.45 billion (€0.31 billion related parties)
- **Current portion of long-term borrowings**: €3.10 billion (€0.04 billion related parties)
- **Long-term borrowings**: €19.37 billion (€0.03 billion related parties)
- **Total Borrowings**: ~€26.92 billion

### Lease Liabilities:
- **Current lease liabilities**: €0.88 billion
- **Noncurrent lease liabilities**: €4.07 billion
- **Total lease liabilities**: €4.95 billion

### Total Adjusted Capital Calculation:
- Equity: €55.23 billion
- Total debt (borrowings + leases): ~€31.87 billion
- **Total Adjusted Capital**: ~€87.1 billion

### Profitability and Cash Flow (2022 fiscal year):
- **Revenue**: €133.69 billion
- **Profit before tax**: €22.05 billion
- **Net profit**: €13.96 billion (vs €5.84 billion prior year)
- **Operating profit**: €17.51 billion
- **Cash flow from operating activities**: €17.46 billion
- **Cash flow from investing activities**: -€7.02 billion
- **Cash flow from financing activities**: -€8.54 billion

### Hybrid/Perpetual Bonds Already in Structure:
From equity movements, I can identify:
- "Increase Decrease Through Net Issue Reimbursement Of Perpetual Subordinated Bonds Equity": €2.0 billion in 2021-2022, €3.0 billion in 2020-2021
- "Decrease Through Coupon Payment On Perpetual Subordinated Bonds Equity": €138 million in 2022, €61 million in 2021
- "Costs For Issue Of Perpetual Subordinated Bonds": €15 million in 2021, €25 million in 2020

This indicates ENI **already has perpetual subordinated bonds (hybrids) in its capital structure** - roughly €5 billion historical issuance with €2 billion net increase in 2021.

## Credit Metric Analysis

### Leverage Position:
- Debt/Equity: ~€26.9bn/€55.2bn = 0.49x (very conservative)
- Debt/Total Capital: ~€26.9bn/€87.1bn = 30.9%
- Net debt position: Considering €10.16 billion cash, net debt is ~€16.7 billion
- Net debt/Equity: ~30%

### Cash Flow Generation:
- FFO (Funds From Operations) proxy: Operating cash flow €17.46 billion + working capital adjustments
- FFO/Debt ratio: Very strong given operating cash flow vs debt burden
- Interest coverage: Finance costs €9.33 billion, but this includes non-cash items; cash interest appears manageable

### Rating Profile Indicators:
- Strong profitability recovery (€13.96bn net profit vs €5.84bn prior year)
- Strong cash generation (€17.46bn operating cash flow)
- Conservative balance sheet with significant equity buffer
- Already has hybrid capacity utilized (existing perpetuals)

## Market Context (2022-2023)

From swap curves:
- 2022: 5Y at 1.726%, 7Y at 1.806%, 10Y at 1.927% (rising rate environment)
- 2020-2021: Negative rates, now positive and rising

From bond spreads:
- iShares Core Euro Corp Bond: 1.085% average in 2022
- Sub-senior delta for non-financial IG: 2.295% in 2022

**Cost of hybrids**: In 2022-2023 rising rate environment, hybrid costs would be materially higher than historical levels. The coupon on new hybrids would likely be in the 5-7% range given rising base rates and typical hybrid spreads.

## Assessment Against Guidelines

### Checking Each Criterion:

**0% Considerations:**
- ❌ Already has hybrids in capital structure (perpetual subordinated bonds)
- ❌ Not in "A" range (integrated oil major typically BBB+/A- area)
- ❌ Cost of hybrid WILL materially increase cost of debt (rising rate environment)
- ❌ But: strong rating profile and low refinancing needs argue for 0%

**3.75% Considerations:**
- Moderate funding needs? ENI has strong cash flow, limited refinancing pressure
- Mild leverage optimization? Already conservative leverage
- Limited but useful rating flexibility? Already has headroom

**7.5% Considerations:**
- Moderate refinancing or acquisition needs? Not clearly present
- Rating headroom moderately constrained? Actually quite comfortable
- Meaningfully improves adjusted leverage? Not necessary given current position

**11.25% Considerations:**
- High capex intensity OR large acquisition pipeline? ENI has energy transition capex but not "transformational" in crisis sense
- Significant leverage pressure? Not present
- Investment grade preservation strongly dependent? No, very comfortable

**15% Considerations:**
- Very high refinancing needs? No
- Material downgrade risk? No
- Substantially required to stabilize leverage? No

## Critical Analysis

**Arguments FOR higher hybrid usage (7.5-11.25%):**
1. ENI is undergoing energy transition with significant capex needs (renewables, decarbonization)
2. Oil and gas volatility requires balance sheet flexibility
3. Integrated majors often use hybrids as standard tool
4. Strong recent profitability supports capacity to pay coupons

**Arguments FOR lower hybrid usage (0-3.75%):**
1. Already has existing hybrid capacity (roughly €5bn historical = ~5.7% of current adjusted capital)
2. Very strong current leverage metrics - no pressing need
3. Rising rate environment means new hybrids are EXPENSIVE
4. Strong cash generation (€17.5bn operating cash flow) funds capex internally
5. No material downgrade risk
6. No large acquisition pipeline visible
7. Net debt position is very comfortable

## Existing Hybrid Position

From the equity statement:
- 2020: +€3.0 billion issuance
- 2021: +€2.0 billion issuance  
- Running coupon payments of €138m on ~€5bn = ~2.8% coupon (historically very low)

Current hybrids outstanding appear to be roughly €5 billion, which is already about **5.7% of total adjusted capital**. 

Given S&P's 15% cap and existing ~5.7% utilization, ENI has roughly **9.3% remaining capacity**.

## Final Assessment

ENI's situation aligns most closely with **3.75%** or potentially **7.5%**, but I need to weigh:

- **Already has ~5.7% in hybrids**: This suggests some ongoing utility, but not maximum usage
- **No pressing leverage need**: Metrics are strong
- **Rising rate environment**: New issuance is expensive (coupons would be 5-7% vs historical ~2.8%)
- **Energy transition capex**: Moderate ongoing need for flexibility
- **Strong cash flow**: €17.5bn operating cash flow vs €7.0bn investing outflow = €10.5bn free cash flow pre-dividends

The key discriminator is: would hybrid issuance "meaningfully improve adjusted leverage metrics" or is it "limited but useful rating flexibility"?

Given:
- Current leverage is already conservative (Net debt/EBITDA likely <1.5x)
- No rating pressure
- But energy transition requires sustained capex
- Existing hybrid base to maintain/roll

ENI should **maintain but not aggressively expand** hybrid usage. The 3.75% represents incremental new issuance capacity on top of existing hybrids, or total target around that level. However, with existing ~5.7%, adding 3.75% would take total to ~9.5%, which is reasonable.

Actually, re-reading: the question asks "to what extent should this company utilize hybrid bonds" - this means total target, not incremental. Given existing ~5.7% and capacity for more, but limited need...

The 3.75% level fits:
- Moderate funding needs (energy transition capex)
- Mild leverage optimization
- Limited but useful rating flexibility
- Cost will increase current cost of debt (true in rising rate environment)

The 7.5% level requires "meaningfully improves adjusted leverage metrics" - but ENI's metrics don't need meaningful improvement.

However, considering ENI is an integrated oil major with:
- Significant energy transition capex ahead
- Desire to maintain strong BBB+/A- rating
- Historical use of hybrids as tool
- Current profitability spike may not last (commodity cyclicality)

A **7.5%** target provides useful buffer without over-committing to expensive instruments in rising rate environment.

But wait - the guidelines say 7.5% is for when "hybrid issuance meaningfully improves adjusted leverage metrics." ENI's metrics are already strong. The 3.75% fits better: "mild leverage optimization rationale," "limited but useful rating flexibility," "cost will increase current cost of debt."

Given rising rates and no pressing need, conservative approach is warranted. The 3.75% represents prudent maintenance of hybrid capacity without aggressive expansion.

<answer>3.75%</answer>