To estimate the FFO/Net debt ratio for ACEA S.P.A. at the end of 2022, we follow standard S&P methodology principles:

1.  **FFO (Funds From Operations):** This is calculated as Cash Flow from Operating Activities adjusted for non-cash items and working capital changes. S&P often defines FFO as Profit/Loss + Depreciation/Amortization + Impairment + Non-cash items (provisions).
    *   Profit/Loss (Group + Non-controlling): 311,160,000 EUR
    *   Depreciation/Amortization: 594,636,000 EUR
    *   Impairment Losses: 67,680,000 EUR
    *   Increase in Provisions (Variazione Fondo Rischi + Variazione Netta Fondo Per Benefici Ai Dipendenti): 14,167,000 - 19,158,000 = -4,991,000 EUR
    *   *Calculation:* 311,160,000 + 594,636,000 + 67,680,000 - 4,991,000 = **968,485,000 EUR**

2.  **Net Debt:** S&P generally defines Net Debt as total financial debt minus cash and cash equivalents.
    *   Total Financial Liabilities: We look at Noncurrent Financial Liabilities and Current Financial Liabilities.
        *   Noncurrent Financial Liabilities: 4,722,263,000 EUR
        *   Current Financial Liabilities: 619,418,000 EUR
        *   Total Gross Debt = 5,341,681,000 EUR
    *   Cash and Cash Equivalents: 559,908,000 EUR
    *   *Calculation:* 5,341,681,000 - 559,908,000 = **4,781,773,000 EUR**

3.  **FFO / Net Debt Ratio:**
    *   FFO / Net Debt = 968,485,000 / 4,781,773,000 = 0.20253...

Rounding the result to the standard representation of this ratio (as a decimal or percentage), we arrive at the following value:

<answer>0.2025</answer>