To estimate the S&P-adjusted FFO-to-debt ratio for Acea S.p.A. for the fiscal year ended December 31, 2022, we follow the workflow based on the provided facts and industry methodology.

### Step 1: Identify the Relevant Industry

Acea S.p.A. is an Italian multi-utility company primarily engaged in the management of water, electricity, gas, and environmental services. The provided text outlines methodologies for "Regulated Utilities," "Oil And Gas Exploration And Production," "Unregulated Power And Gas," and "Transportation Infrastructure."

Given Acea's core business involves water distribution, electricity distribution, and waste management, often under regulatory frameworks or concessions, it fits best within the **Regulated Utilities** sector description ("Companies that provide an essential or near-essential infrastructure product... subject to comprehensive regulation... Subsectors: Multi-utilities, Water, Electricity"). While some activities may be unregulated, the dominant characteristic for credit analysis of such entities is typically the regulated utility framework. We will apply the **Regulated Utilities** methodology.

### Step 2: Estimate Adjusted EBITDA

The baseline formula is:
`Adjusted_EBITDA = EBITDA (reported or reconstructed) + adjustment_leases + nonrecurring_losses - nonrecurring_gains ± pension_adjustments ± joint_venture_proportional_EBITDA ± other_normalization_adjustments`

First, we reconstruct EBITDA from the Income Statement data provided for 2022:
*   **Profit Loss From Operating Activities (EBIT):** 565,851,000 EUR
*   **Adjustments For Depreciation And Amortisation Expense:** 594,636,000 EUR
*   **Adjustments For Impairment Loss...:** 67,680,000 EUR

Reported EBITDA is typically calculated as EBIT + Depreciation & Amortization.
`EBITDA_reported = 565,851,000 + 594,636,000 = 1,160,487,000 EUR`

However, S&P often starts with Operating Cash Flow before working capital changes or adjusts EBITDA for specific items. Let's look at the Cash Flow statement provided:
*   **Cash Flows From Used In Operations Before Changes In Working Capital:** 1,062,464,000 EUR

This figure (CFO before WC) is a close proxy for EBITDA adjusted for cash taxes and interest paid/received if we back them out, but usually, EBITDA is an accrual concept. Let's stick to the accrual reconstruction and apply adjustments.

**Adjustments:**
1.  **Leases:** The company has "Right-of-use Assets" of 90,397,000 EUR (2023) and 53,096,000 EUR (2022). Under IFRS 16, depreciation of ROU assets is included in EBITDA (via the D&A add-back), but the interest portion of lease payments is in Finance Costs. S&P typically adds back the interest portion of lease payments to EBITDA if it was deducted to arrive at EBIT, or treats the entire lease payment as an operating expense in some older methodologies. However, the standard S&P adjustment for leases in the debt calculation is to capitalize them. For EBITDA, since IFRS 16 EBITDA already includes the ROU depreciation (non-cash) but excludes the lease interest (financial), and S&P FFO is often derived from EBITDA minus cash interest, we need to be consistent.
    *   Standard S&P practice for Regulated Utilities: Use reported EBITDA. IFRS 16 EBITDA is generally accepted.
    *   Let's check for **Non-recurring items**. The "Adjustments For Impairment Loss" of 67,680,000 EUR is added back to EBIT to get EBITDA? No, impairment is usually a non-cash charge below EBITDA or included in operating expenses. In the cash flow, it's an adjustment. In the P&L, "Impairment Loss... IFRS9" is 113,370,000 EUR. The cash flow adjustment is 67,680,000 EUR. This suggests some impairment is non-cash or reversed.
    *   Usually, S&P adds back significant non-recurring impairments. The prompt lists "Impairment Loss Impairment Gain... IFRS9" as 113,370,000 EUR. This is likely financial impairment (receivables). The cash flow adjustment for impairment is 67,680,000.
    *   Let's use the **Cash Flow from Operations before Working Capital** as a robust starting point for "Funds From Operations" proxy, but the formula asks for Adjusted EBITDA first.
    *   Let's calculate EBITDA strictly:
        *   EBIT (Profit from Operating Activities): 565,851,000
        *   Add: Depreciation & Amortization: 594,636,000
        *   Add: Impairment (Operating): The line "Impairment Loss... IFRS9" is 113,370,000. IFRS 9 impairments are often on financial assets (trade receivables). If these are included in Operating Expenses, they reduce EBIT. If they are non-cash, they are added back to get to a cash-flow-like EBITDA. The Cash Flow statement adds back 67,680,000 for impairment. This discrepancy might be due to reversals or provisions.
        *   Let's assume the standard EBITDA = EBIT + D&A.
        *   `EBITDA = 565,851,000 + 594,636,000 = 1,160,487,000 EUR`.

    *   **Joint Ventures:** The line "Share Of Profit Loss Of Associates And Joint Ventures Accounted For Using Equity Method" is 17,793,000 EUR. This is included in Profit Before Tax but *not* in EBIT (Operating Profit) typically, or it is below the operating line. In the provided data, "Profit Loss From Operating Activities" is 565,851,000. Then "Finance Income/Costs" and "Share of Profit...". This implies the JV share is *below* EBIT. S&P often prefers to include the proportional EBITDA of JVs. However, without specific JV EBITDA data, we often leave it out or add the equity income back if it's considered recurring. For regulated utilities, if JVs are integral, we might add it. But strictly, FFO is usually Group level. Let's stick to the reported group numbers unless specified. The prompt asks to modify as required. Without specific JV debt/EBITDA breakdown, we will use the consolidated reported figures which include the equity pick-up in Net Income but not in EBITDA. Wait, if it's equity method, it's not in EBITDA. S&P might add it back to FFO. Let's look at the FFO formula.

    Let's refine the **Adjusted EBITDA**:
    Reported EBITDA = 1,160,487,000 EUR.
    Are there non-recurring gains/losses? The impairment of 113M (IFRS9) is likely credit losses on receivables, which can be recurring for a utility. We will treat it as recurring.
    
    So, `Adjusted_EBITDA ≈ 1,160,487,000 EUR`.

### Step 3: Estimate FFO

Formula: `FFO = Adjusted_EBITDA - cash_interest - cash_taxes`

1.  **Cash Interest:**
    *   Reported "Finance Costs": 111,670,000 EUR.
    *   Reported "Finance Income": 25,962,000 EUR.
    *   Net Finance Costs in P&L: 111,670,000 - 25,962,000 = 85,708,000 EUR.
    *   However, FFO uses **Cash** Interest.
    *   From Cash Flow Statement:
        *   "Interest Paid Classified As Financing Activities": 114,121,000 EUR.
        *   "Interest Received Classified As Investing Activities": 29,243,000 EUR.
    *   S&P typically defines Cash Interest as interest paid minus interest received (if interest received is considered part of operating cash flow, it might be netted; if investing, it's often kept separate or netted against debt service). The standard definition for FFO deduction is **Net Cash Interest Paid**.
    *   `Cash Interest Paid` = 114,121,000 EUR.
    *   `Cash Interest Received` = 29,243,000 EUR.
    *   Net Cash Interest = 114,121,000 - 29,243,000 = 84,878,000 EUR.
    *   Alternatively, sometimes only interest *paid* is subtracted if interest received is added to EBITDA (it's not, it's below EBIT). EBITDA is pre-interest. So we subtract gross interest paid? No, FFO is funds available to pay debt. Interest received is a source of funds. So `FFO = EBITDA - Net Cash Interest - Cash Taxes`.
    *   Let's use **Net Cash Interest** = 84,878,000 EUR.

2.  **Cash Taxes:**
    *   From Cash Flow Statement: "Income Taxes Paid Refund Classified As Operating Activities": 178,506,000 EUR.
    *   This is the cash outflow for taxes.
    *   `Cash Taxes` = 178,506,000 EUR.

3.  **Calculate FFO:**
    *   `FFO = 1,160,487,000 - 84,878,000 - 178,506,000`
    *   `FFO = 897,103,000 EUR`.

    *Self-Correction/Refinement:* Does "Cash Flows From Used In Operations Before Changes In Working Capital" (1,062,464,000) provide a better check?
    CFO before WC = EBITDA - Cash Interest - Cash Taxes + Other non-cash/working capital adjustments?
    Actually, `CFO before WC` usually equals `EBITDA - Cash Interest - Cash Taxes` if there are no other non-cash operating items (like stock comp, provisions changes not in WC).
    Let's check the difference:
    Calculated FFO (897M) vs CFO before WC (1,062M).
    Difference = 165M.
    Why?
    CFO before WC starts from Net Income and adds back D&A, Impairment, etc.
    Net Income = 311,160,000.
    Add: Tax 186,777,000.
    Add: Finance Costs 111,670,000.
    Less: Finance Income (25,962,000).
    Add: D&A 594,636,000.
    Add: Impairment 67,680,000.
    Add: Share of JV (17,793,000) -> This is a non-cash income, so it should be subtracted? Or added back if it was deducted? It's income, so it increases Net Income. To get to cash from ops, we subtract equity income not received in cash.
    Let's reconstruct CFO before WC from Net Income:
    NI: 311,160,000
    + Tax: 186,777,000
    + Net Finance Cost: 85,708,000 (111.67 - 25.96)
    + D&A: 594,636,000
    + Impairment: 67,680,000
    - Share of JV Profit: (17,793,000) (Non-cash income included in NI)
    + Other adjustments (Provisions, etc.): The CF statement shows "Variazione Fondo Rischi" 14,167,000 and "Variazione Netta Fondo Per Benefici" -19,158,000.
    Sum: 311.16 + 186.78 + 85.71 + 594.64 + 67.68 - 17.79 + 14.17 - 19.16 = 1,223.19 M.
    This is higher than 1,062 M. There are likely other adjustments or the "Finance Income" classification differs.
    
    Let's rely on the explicit formula: `FFO = Adjusted EBITDA - Cash Interest - Cash Taxes`.
    
    Is there a better EBITDA?
    Sometimes S&P uses "EBITDA" as reported by the company. Acea reports "Margine Operativo Lordo" (EBITDA).
    Looking at the data: "Gross Profit" is 1,305,021,000. "Operating Expense" is 3,861,121,000? No, Revenue is 5,138,245,000.
    Revenue - Operating Expense = 5,138,245,000 - 3,861,121,000 = 1,277,124,000. This is close to Gross Profit but not exact.
    "Profit Loss From Operating Activities" (EBIT) = 565,851,000.
    D&A = 594,636,000.
    EBITDA = 1,160,487,000.
    
    Let's check if there are lease adjustments for EBITDA. Under IFRS 16, EBITDA includes the depreciation of ROU assets. S&P often considers this acceptable for Regulated Utilities.
    
    So, `FFO = 1,160,487,000 - 84,878,000 (Net Cash Interest) - 178,506,000 (Cash Taxes) = 897,103,000 EUR`.

### Step 4: Estimate Adjusted Debt

Formula: `Adjusted_Debt = (reported_debt + leases + pension_deficit + guarantees + hybrid_debt_portion + other_debt_like_items) - eligible_cash`

1.  **Reported Debt:**
    *   Noncurrent Financial Liabilities: "Other Noncurrent Financial Liabilities" = 4,791,979,000 EUR.
    *   Current Financial Liabilities: "Other Current Financial Liabilities" = 285,222,000 EUR.
    *   Total Reported Debt = 4,791,979,000 + 285,222,000 = 5,077,201,000 EUR.
    *   Note: "Noncurrent Contract Liabilities" (5,514,512,000) are likely regulatory deferrals or customer advances, not interest-bearing debt. "Trade And Other Current Payables" are operational.

2.  **Leases:**
    *   S&P capitalizes operating leases. Since the company reports under IFRS 16, the lease liability is already included in "Financial Liabilities" (split between current and non-current).
    *   We need to determine if the reported financial liabilities *include* the lease liabilities.
    *   Total Lease Liability is not explicitly broken out in the liabilities list, but "Right-of-use Assets" are 53,096,000 (2022). The corresponding liability is usually similar.
    *   If the reported "Other Noncurrent/Current Financial Liabilities" include the lease liabilities (which is standard for IFRS 16), we should not double-count.
    *   However, S&P sometimes adjusts debt to include the *full* lease obligation if only a portion is capitalized or for comparability. But with IFRS 16, the liability is on the balance sheet.
    *   We will assume the reported financial debt includes the lease liabilities. If we need to add "leases" as an adjustment, it's usually for companies that haven't capitalized them. Here they are capitalized. So `Leases Adjustment = 0` (already included).

3.  **Pension Deficit:**
    *   "Noncurrent Provisions For Employee Benefits": 120,150,000 EUR.
    *   S&P treats underfunded pension liabilities as debt.
    *   We assume the provision represents the net deficit.
    *   `Pension Deficit = 120,150,000 EUR`.

4.  **Eligible Cash:**
    *   "DisponibilitàLiquide EMezzi Equivalenti" (Cash and Cash Equivalents): 680,820,000 EUR (at 2022-01-01? No, the label says 2022-01-01 for the start, but typically balance sheet items are at period end. The column header is "2022-01-01 - 2023-01-01" for flows, but for Balance Sheet items like "Property Plant...", it lists "2023-01-01" and "2022-01-01".
    *   We need the debt and cash at the *end* of 2022 (which is 2023-01-01 in the data labels, or is 2022-01-01 the end of 2021?).
    *   Let's check the dates carefully.
        *   "Revenue" 2022-01-01 - 2023-01-01 is the 2022 fiscal year.
        *   Balance Sheet items: "Property Plant And Equipment" 2023-01-01 is the closing balance for 2022. "Property Plant And Equipment" 2022-01-01 is the opening balance (end of 2021).
        *   So we must use the **2023-01-01** column for Balance Sheet items to get the year-end 2022 position.
    
    *   **Recalculating with Year-End 2022 (2023-01-01) Balance Sheet Data:**
    
    *   **Debt (2023-01-01):**
        *   Other Noncurrent Financial Liabilities: 4,722,263,000 EUR.
        *   Other Current Financial Liabilities: 619,418,000 EUR.
        *   Total Reported Debt = 4,722,263,000 + 619,418,000 = 5,341,681,000 EUR.
    
    *   **Pension Deficit (2023-01-01):**
        *   Noncurrent Provisions For Employee Benefits: 112,989,000 EUR.
    
    *   **Cash (2023-01-01):**
        *   Cash and Cash Equivalents: 559,908,000 EUR.
        *   "DisponibilitàMonetaria Netta" is listed as 559,908,000 EUR. This confirms the cash figure.
        *   S&P allows deduction of unrestricted cash. We assume all cash is eligible unless stated otherwise.
    
    *   **Adjusted Debt Calculation:**
        *   Reported Debt: 5,341,681,000
        *   Add: Pension Deficit: 112,989,000
        *   Less: Eligible Cash: 559,908,000
        *   `Adjusted_Debt = 5,341,681,000 + 112,989,000 - 559,908,000`
        *   `Adjusted_Debt = 4,894,762,000 EUR`.

    *   *Note on Leases:* The ROU Asset at 2023-01-01 is 90,397,000. The lease liability is embedded in the financial liabilities. We do not add it again.

### Step 5: Calculate FFO / Adjusted Debt

We need the FFO for the year 2022. The FFO calculation used P&L and Cash Flow data for the period 2022-01-01 to 2023-01-01.
`FFO = 897,103,000 EUR`.

`Adjusted_Debt = 4,894,762,000 EUR`.

`Ratio = 897,103,000 / 4,894,762,000`

Calculation:
897,103,000 / 4,894,762,000 ≈ 0.183278

Let's double check the FFO components.
Is "Cash Flows From Used In Operations Before Changes In Working Capital" a better proxy for FFO?
S&P FFO is essentially Operating Cash Flow before working capital changes, minus maintenance capex? No, FFO is pre-capex.
S&P FFO = Net Income + D&A + Impairment + Deferred Taxes - Gains on Asset Sales +/- Other.
Or FFO = EBITDA - Cash Interest - Cash Taxes.

Let's verify the Cash Interest again.
Interest Paid: 114,121,000.
Interest Received: 29,243,000.
Net: 84,878,000.

Cash Taxes: 178,506,000.

EBITDA: 1,160,487,000.

FFO = 1,160,487,000 - 84,878,000 - 178,506,000 = 897,103,000.

Let's check if there are any **preferred dividends** or **minority interests** to adjust.
FFO is typically available to common shareholders and debt holders.
S&P FFO usually does not deduct minority interests unless calculating FFO attributable to parent. But for leverage ratios, we often use Group FFO and Group Debt.
The debt calculated is Group Debt. The FFO should be Group FFO.
Our EBITDA is Group EBITDA.
Cash Interest is Group Cash Interest.
Cash Taxes is Group Cash Taxes.
So the FFO figure of 897M is the Group FFO.

One potential adjustment: **Joint Ventures**.
If the JVs are significant, S&P might proportionally consolidate them.
"Share Of Profit Loss Of Associates...": 17,793,000.
This is small relative to EBITDA (1.1B). Ignoring proportional consolidation is likely acceptable given the data constraints.

Another check: **Working Capital**.
S&P FFO does *not* subtract working capital changes. It is a pre-working capital measure. So our formula is correct.

Final Ratio:
0.183278...

Rounding to four decimal places: 0.1833.

<answer>0.1833</answer>