To estimate the Net Debt / EBITDA ratio for ERG S.p.A. for the year 2022 based on the S&P methodology, we need to determine two components: EBITDA and Net Debt.

**1. Calculate EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization)**

The provided data explicitly lists "Profit Loss From Operating Activities Before Interest Taxes Depreciation And Amortisation Expense" for the period 2022-01-01 to 2023-01-01. This is the standard definition of EBITDA.

*   **EBITDA (2022):** 499,430,000.0 EUR

*Note: S&P Global Ratings typically uses the last twelve months (LTM) or the most recent full fiscal year. Here we use the full year 2022 figure provided.*

**2. Calculate Net Debt**

S&P's definition of Net Debt generally includes:
*   Total Debt (Short-term and Long-term interest-bearing liabilities)
*   Less: Cash and Cash Equivalents
*   Adjustments may include certain lease liabilities, minority interest in debt, etc., but the core is Interest-Bearing Debt minus Cash.

From the balance sheet data at 2022-01-01 (Start of 2022) and 2023-01-01 (End of 2022), we should use the year-end figures (2023-01-01) for the ratio denominator if calculating a point-in-time ratio at year-end, or an average if specified. Standard practice for a "2022 ratio" often uses the year-end balance sheet figures unless an average is requested. Let's look at the components at 2023-01-01 (which represents the end of the 2022 fiscal year).

**Components of Debt (Interest-Bearing Liabilities) at 2023-01-01:**
*   `Other Noncurrent Financial Liabilities`: 1,751,255,000.0 EUR
*   `Noncurrent Lease Liabilities`: 150,955,000.0 EUR
*   `Current Financial Liabilities At Fair Value Through Profit Or Loss`: 76,644,000.0 EUR
*   `Other Current Financial Liabilities`: 389,716,000.0 EUR
*   `Current Lease Liabilities`: 6,362,000.0 EUR

*Note: `Noncurrent Financial Liabilities At Fair Value Through Profit Or Loss` is 0.0 EUR.*

Total Debt = 1,751,255,000 + 150,955,000 + 76,644,000 + 389,716,000 + 6,362,000
Total Debt = 2,374,932,000.0 EUR

**Cash and Cash Equivalents at 2023-01-01:**
*   `Cash And Cash Equivalents`: 392,811,000.0 EUR

**Net Debt Calculation:**
Net Debt = Total Debt - Cash and Cash Equivalents
Net Debt = 2,374,932,000.0 - 392,811,000.0
Net Debt = 1,982,121,000.0 EUR

*Alternative Check using 2022-01-01 (Start of year) balances:*
*   Debt: `Other Noncurrent Financial Liabilities` (2,064,088,000) + `Noncurrent Financial Liabilities FV` (44,763,000) + `Noncurrent Lease Liabilities` (122,663,000) + `Other Current Financial Liabilities` (1,342,688,000) + `Current Financial Liabilities FV` (170,857,000) + `Current Lease Liabilities` (6,282,000) = 3,751,341,000 EUR.
*   Cash: 860,352,000 EUR.
*   Net Debt (Start): 2,890,989,000 EUR.

S&P often uses the year-end debt figure for the ratio unless specified as "average". Given the significant deleveraging during the year (likely due to the discontinued operations/divestments mentioned in the cash flow from losing control of subsidiaries), the year-end figure is the most relevant snapshot of the company's current leverage profile post-transactions.

Let's stick with the Year-End (2023-01-01) Net Debt.

**3. Calculate the Ratio**

Ratio = Net Debt / EBITDA
Ratio = 1,982,121,000.0 / 499,430,000.0

Calculation:
1,982,121,000 / 499,430,000 ≈ 3.9687

Let's double check if "Other Current Financial Liabilities" and "Other Noncurrent Financial Liabilities" are entirely interest-bearing debt. In utility/energy companies like ERG, these lines typically comprise bank loans, bonds, and other borrowings. The label "Financial Liabilities" strongly suggests debt. Lease liabilities are also included in S&P's debt definition.

Is there any minority interest in debt to add?
`Profit Loss Attributable To Noncontrolling Interests` is small (4.1M). `Noncontrolling Interests` equity is 9.3M. It is unlikely there is significant minority debt not consolidated in the financial liabilities lines, or it is already included in the consolidated figures. S&P adds minority interest in debt if it's not consolidated, but here the liabilities are consolidated.

So, Net Debt = 1,982,121,000 EUR.
EBITDA = 499,430,000 EUR.

Ratio = 3.97

Let's consider if we should use Average Net Debt.
Average Net Debt = (2,890,989,000 + 1,982,121,000) / 2 = 2,436,555,000 EUR.
Ratio (Average) = 2,436,555,000 / 499,430,000 ≈ 4.88.

However, standard "Net Debt/EBITDA" reporting usually implies the most recent period-end Net Debt against the trailing twelve months EBITDA. The drastic change in debt is due to "Cash Flows From Losing Control Of Subsidiaries" (1.26B inflow) and repayments. The year-end balance sheet reflects the ongoing entity's leverage. S&P methodology for corporate ratings typically uses the reported debt at the balance sheet date closest to the rating date. For an annual report analysis, the year-end figure is standard.

Let's refine the Debt components.
S&P defines Debt as:
- Short-term and long-term bank loans
- Bonds and notes
- Capital leases (Lease liabilities are included)
- Minority interest in debt (if any)
- Less: Cash and short-term investments (sometimes restricted cash is excluded from cash deduction, but we don't have that breakdown, so we use total Cash & Cash Equivalents).

The items identified:
1.  `Other Noncurrent Financial Liabilities`: 1,751,255,000
2.  `Noncurrent Lease Liabilities`: 150,955,000
3.  `Current Financial Liabilities At Fair Value Through Profit Or Loss`: 76,644,000
4.  `Other Current Financial Liabilities`: 389,716,000
5.  `Current Lease Liabilities`: 6,362,000

Sum = 2,374,932,000.

Cash = 392,811,000.

Net Debt = 1,982,121,000.

EBITDA = 499,430,000.

Ratio = 1,982,121,000 / 499,430,000 = 3.96876...

Rounding to two decimal places: 3.97.

<answer>3.97</answer>