To estimate the Net Debt / EBITDA ratio for Italgas S.p.A. for the year 2022 (period 2022-01-01 to 2023-01-01) using the S&P methodology, we need to calculate two components: Adjusted EBITDA and Net Debt.

**1. Calculate Adjusted EBITDA**

S&P typically defines EBITDA as Earnings Before Interest, Taxes, Depreciation, and Amortization. We can derive this from the provided Income Statement data for the period 2022-01-01 to 2023-01-01.

*   **Profit Loss From Operating Activities (EBIT):** 641,338,000 EUR
*   **Depreciation, Amortisation and Impairment:** 479,186,000 EUR
    *   *Note: The line item "Depreciation Amortisation And Impairment Loss Reversal Of Impairment Loss Recognised In Profit Or Loss" is the standard add-back for D&A.*

**EBITDA Calculation:**
$$EBITDA = \text{Operating Profit} + \text{Depreciation \& Amortization}$$
$$EBITDA = 641,338,000 + 479,186,000 = 1,120,524,000 \text{ EUR}$$

*Self-Correction/Refinement:* S&P often adjusts EBITDA for other non-recurring items or specific equity income/expenses if they are considered part of core operations or if the definition is "Adjusted EBITDA". However, without specific adjustments for "non-recurring" items explicitly labeled as such in the text (other than standard D&A), we will use the standard operational EBITDA derived above. Some methodologies might add back "Share of profit of associates" if excluded from Operating Profit, but here "Profit Loss From Operating Activities" is given, and "Share Of Profit Loss Of Associates..." is listed below it or separately. Looking at the structure:
*   Revenue and Operating Income: 2,312,476,000
*   Operating Expense: 1,191,952,000
*   Depreciation...: 479,186,000
*   Profit Loss From Operating Activities: 641,338,000.
    *   Check: $2,312,476,000 - 1,191,952,000 - 479,186,000 = 641,338,000$. This confirms Operating Profit is after D&A.
    *   Therefore, adding D&A back to Operating Profit gives us EBITDA.

**EBITDA = 1,120,524,000 EUR**

**2. Calculate Net Debt**

S&P defines Net Debt as Total Debt minus Cash and Cash Equivalents (and sometimes highly liquid short-term investments). Total Debt includes short-term and long-term interest-bearing borrowings.

**A. Identify Debt Components (Liabilities)**
We need to sum up financial liabilities. Based on the balance sheet items for 2023-01-01 (end of period 2022):

*   **Short Term Financial Liabilities:**
    *   "Short Term Financial Liabilities Excluding Other Current Financial Liabilities": 142,437,000 EUR
    *   "Other Current Financial Liabilities": 290,000 EUR
    *   *Total Short Term Debt* = $142,437,000 + 290,000 = 142,727,000$ EUR

*   **Long Term Financial Liabilities:**
    *   "Long Term Financial Liabilities Excluding Other Non Current Financial Liabilities": 6,402,913,000 EUR
    *   "Other Noncurrent Financial Liabilities": 34,000 EUR
    *   *Total Long Term Debt* = $6,402,913,000 + 34,000 = 6,402,947,000$ EUR

*   **Total Gross Debt** = $142,727,000 + 6,402,947,000 = 6,545,674,000$ EUR

*Note: "Trade And Other Current Payables" and "Other Current Nonfinancial Liabilities" are generally operating liabilities, not debt, so they are excluded.*

**B. Identify Cash and Cash Equivalents (Assets)**
*   "Cash And Cash Equivalents" (2023-01-01): 451,946,000 EUR

*Note: S&P may also deduct "Current Financial Assets" if they are considered cash equivalents or highly liquid. Let's look at "Current Financial Assets Excluding Other Current Financial Assets" (5,770,000 EUR) and "Other Current Financial Assets" (17,455,000 EUR). Usually, strict Net Debt only deducts Cash & Cash Equivalents. However, sometimes "Marketable Securities" are deducted. Given the small size relative to debt, and the label "Cash And Cash Equivalents" being explicit, we will stick to the explicit cash line. If we were to include all current financial assets: $451,946,000 + 5,770,000 + 17,455,000 = 475,171,000$. The difference is minimal (~23M). Standard S&P methodology usually deducts Cash, Cash Equivalents, and Short-term Investments. "Current Financial Assets" often contains short-term investments. Let's assume the strict definition of Net Debt = Gross Debt - Cash & Cash Equivalents. If the result seems off, we might reconsider including short-term investments. However, "Cash And Cash Equivalents" is the most standard deduction.*

Let's calculate Net Debt with just Cash & Cash Equivalents:
$$Net Debt = \text{Total Gross Debt} - \text{Cash and Cash Equivalents}$$
$$Net Debt = 6,545,674,000 - 451,946,000 = 6,093,728,000 \text{ EUR}$$

**3. Calculate Ratio**

$$\text{Net Debt / EBITDA} = \frac{6,093,728,000}{1,120,524,000}$$

$$\text{Ratio} \approx 5.438$$

Let's double check if there are any other debt-like items.
"Lease Liabilities" are often included in S&P Net Debt.
The item "Costs For The Use Of Third Party Assets" suggests operating leases or similar, but under IFRS 16, these are capitalized.
Looking at the liabilities, we have "Other Noncurrent Nonfinancial Liabilities" (545,192,000 EUR) and "Other Current Nonfinancial Liabilities" (30,072,000 EUR). Under IFRS 16, lease liabilities are often separated or included in financial liabilities. In many European reports, "Financial Liabilities" include lease liabilities. The line items "Short Term Financial Liabilities..." and "Long Term Financial Liabilities..." likely include the lease portions if classified as financial. If they are classified as "Nonfinancial", we might need to add them.
However, typically "Financial Liabilities" captures interest-bearing debt including leases. The label "Nonfinancial" for the other items suggests they are provisions or trade-related.
Let's assume the "Financial Liabilities" lines capture all interest-bearing debt (including leases).

Let's re-verify the EBITDA.
Is there any "Equity Income" to add back?
"Share Of Profit Loss Of Associates..." is 3,432,000 EUR.
"Effect Of Valuation Using The Equity Method" is 662,000 EUR.
These are usually below the Operating Profit line or non-cash/non-core. S&P Adjusted EBITDA often adds back equity income if it's not part of core ops, or ignores it if it's already excluded from EBIT. Since our starting point is "Profit Loss From Operating Activities", and equity income is typically non-operating or below the line, it is not included in the 641M figure. Therefore, we do not need to subtract it. If it *were* included in Operating Profit, we would subtract it. Given the standard structure, Operating Profit usually excludes equity income.

Let's check if "Depreciation" figure includes impairment reversals.
The line is "Depreciation Amortisation And Impairment Loss Reversal...".
Value: 479,186,000.
There is a separate line "Impairment Loss Reversal... Recognised In Profit Or Loss" with value -342,000 (expense/reversal?).
And "Adjustments For Impairment Loss..." in cash flow is 895,000.
The D&A line is the primary add-back.

Let's refine the Net Debt calculation.
S&P often includes "Hybrid Debt" or other adjustments. None are explicitly identified as hybrid here.
S&P often deducts "Unrestricted Cash". We used total Cash & Cash Equivalents.

Calculation:
Numerator: 6,093,728,000
Denominator: 1,120,524,000
Result: 5.43828...

Let's consider if "Current Financial Assets" should be deducted.
If we deduct all current financial assets (Cash 451.9M + Current Fin Assets 5.77M + Other Current Fin Assets 17.45M = ~475.17M):
Net Debt = 6,545,674,000 - 475,171,000 = 6,070,503,000
Ratio = 6,070,503,000 / 1,120,524,000 = 5.417

The difference is small (5.44 vs 5.42). Standard "Net Debt" usually refers to Interest Bearing Debt minus Cash and Cash Equivalents. I will stick to the stricter definition unless "Financial Assets" are clearly cash equivalents. "Current Financial Assets" can include derivatives or short-term loans to third parties, which are not always cash equivalents. "Cash And Cash Equivalents" is the safest deduction.

One more check: Did we use the correct year?
The prompt asks for the ratio for 2022.
The data provided is for the period ending 2023-01-01 (which is the FY 2022 report).
EBITDA is for the period 2022-01-01 to 2023-01-01. Correct.
Net Debt is a snapshot at the end of the period (2023-01-01). Correct.

Final values:
EBITDA = 1,120,524,000 EUR
Net Debt = 6,093,728,000 EUR
Ratio = 5.44

<answer>5.44</answer>