To estimate the Funds From Operations (FFO) / Net Debt ratio for Redeia Corporación S.A. for the year 2022 (reporting period 2022-01-01 to 2023-01-01), we follow these steps:

**1. Estimate FFO:**
FFO is typically calculated as Net Profit plus Depreciation and Amortization.
*   Profit/Loss (2022): 681,187,000 EUR
*   Depreciation and Amortisation Expense (2022): 544,992,000 EUR
*   FFO = 681,187,000 + 544,992,000 = 1,226,179,000 EUR

**2. Calculate Net Debt:**
Net Debt is calculated as Total Financial Liabilities (Current + Noncurrent) minus Cash and Cash Equivalents.
*   Noncurrent Financial Liabilities: 5,543,755,000 EUR
*   Current Financial Liabilities: 1,705,277,000 EUR
*   Total Financial Liabilities: 5,543,755,000 + 1,705,277,000 = 7,249,032,000 EUR
*   Cash and Cash Equivalents: 794,824,000 EUR
*   Net Debt = 7,249,032,000 - 794,824,000 = 6,454,208,000 EUR

**3. Calculate FFO / Net Debt Ratio:**
*   Ratio = 1,226,179,000 / 6,454,208,000 ≈ 0.18998

Rounding to standard financial presentation practices, we provide the result.

<answer>0.19</answer>