To estimate the S&P-adjusted FFO-to-debt ratio for ACEA S.P.A. for 2022, we follow the steps provided:

**1. Identify Industry:** ACEA S.P.A. is a multi-utility company (water, energy, environment), falling under the "Regulated Utilities" industry methodology.

**2. Estimate Adjusted_EBITDA:**
*   Reported EBITDA (Margine Operativo Lordo) is effectively the Operating Profit plus Depreciation and Amortization. Using the provided figures:
*   Profit Loss from Operating Activities: 565,851,000 EUR
*   Adjustments for Depreciation and Amortisation: 594,636,000 EUR
*   Adjustments for Impairment: 67,680,000 EUR
*   Adjusted_EBITDA = 565,851,000 + 594,636,000 + 67,680,000 = 1,228,167,000 EUR

**3. Estimate FFO:**
*   FFO = Adjusted_EBITDA - cash_interest - cash_taxes
*   Cash Interest (Finance Costs): 111,670,000 EUR (Using reported Finance Costs as proxy for cash interest)
*   Cash Taxes (Income Taxes Paid): 178,506,000 EUR
*   FFO = 1,228,167,000 - 111,670,000 - 178,506,000 = 937,991,000 EUR

**4. Estimate Adjusted_Debt:**
*   Reported Debt (Noncurrent Financial Liabilities + Current Financial Liabilities): 4,791,979,000 + 285,222,000 = 5,077,201,000 EUR
*   Cash/Cash Equivalents: 680,820,000 EUR (End of 2022)
*   Right-of-use assets (as proxy for lease adjustment): 53,096,000 EUR
*   Adjusted_Debt = 5,077,201,000 + 53,096,000 - 680,820,000 = 4,449,477,000 EUR

**5. Calculate FFO / Adjusted_Debt Ratio:**
*   Ratio = 937,991,000 / 4,449,477,000 ≈ 0.210810

<answer>0.2108</answer>