To estimate the FFO (Funds From Operations) to Net Debt ratio for Acciona SA using S&P methodology, we perform the following calculations:

**1. Calculate FFO (Funds From Operations):**
S&P typically defines FFO as Cash Flow from Operations (CFO) adjusted for non-recurring items and changes in working capital, or simply CFO minus changes in working capital plus dividends received.
*   "Cash Flows From Used In Operating Activities" (2022-01-01 - 2023-01-01): 1,648,000,000 EUR
*   "Increase Decrease In Working Capital": 135,000,000 EUR
*   S&P methodology often adds back dividends received from associates/joint ventures (if not already included in core operating cash flow) and subtracts interest paid.
*   Adjusted CFO (FFO approximation): 1,648,000,000 (Reported CFO) - 135,000,000 (Change in Working Capital) = 1,513,000,000 EUR.

**2. Calculate Net Debt:**
S&P defines Net Debt as total financial debt minus cash and cash equivalents.
*   "Noncurrent Portion Of Noncurrent Loans Received": 2,624,000,000 EUR
*   "Current Loans Received And Current Portion Of Noncurrent Loans Received": 553,000,000 EUR
*   "Participaciones Preferentes Obligaciones YOtros Valores Negociables No Corrientes1": 3,101,000,000 EUR
*   "Participaciones Preferentes Obligaciones YOtros Valores Negociables Corrientes": 1,139,000,000 EUR
*   Total Financial Debt = 2,624 + 553 + 3,101 + 1,139 = 7,417,000,000 EUR.
*   "Cash And Cash Equivalents": 2,360,000,000 EUR.
*   Net Debt = 7,417,000,000 - 2,360,000,000 = 5,057,000,000 EUR.

**3. Ratio Calculation:**
*   FFO / Net Debt = 1,513,000,000 / 5,057,000,000 ≈ 0.299189.

Rounding to significant digits consistent with financial reporting, we arrive at the ratio.

<answer>0.299</answer>