To determine the appropriate reliance on hybrid bonds for ELECTRICITE DE FRANCE (EDF), we must analyze the company's financial profile, existing capital structure, and the strategic role of hybrid bonds.

1.  **Financial Health & Leverage:** EDF's 2022 annual report reveals a financially distressed situation. The company reported a massive net loss of -€18.2 billion and a severely negative Operating Profit Before Depreciation and Amortisation of -€5.0 billion. Furthermore, total Equity plummeted from €62.0 billion at the end of 2021 to €46.6 billion at the end of 2022, with Equity Attributable to Owners of the Parent dropping to €34.3 billion. Meanwhile, total liabilities surged to €341.5 billion (Noncurrent €203.9B + Current €137.5B). The debt-to-equity ratio is exceptionally high, indicating an urgent need for equity-like funding rather than additional traditional debt.

2.  **Cash Flow & Capital Expenditure:** EDF is capital-intensive. Cash flows from operating activities turned negative at -€7.4 billion, while purchases of Property, Plant, and Equipment remained massive at -€18.3 billion. This resulted in a severe free cash flow deficit, heavily funded by a massive increase in borrowings (€34.2 billion issued in 2022 vs €6.9 billion in 2021).

3.  **Existing Use of Hybrids:** EDF is already a significant issuer of hybrid bonds (perpetual subordinated bonds). The balance sheet shows €994 million issued in 2022, with €606 million in payments and €1.025 billion in redemptions. These instruments currently bridge the gap between debt and equity, providing subordinate funding that is treated as 50% equity by rating agencies, thus helping to support the heavily leveraged balance sheet.

4.  **Strategic Role of Hybrids:** Given the severe deterioration in the equity base and the massive capex requirements (nuclear maintenance, new nuclear builds like Hinkley Point C and Sizewell C, and renewable expansion), EDF requires substantial capital that does not immediately burden the stressed income statement with mandatory interest payments. Relying 100% on hybrids for capital structure needs is not feasible, as they carry higher coupon risks and cannot replace the foundational equity layer entirely. Conversely, 0% reliance ignores their critical current and historical role in EDF's capital structure. A 50% reliance appropriately reflects that hybrid bonds constitute a substantial, essential layer of EDF's capital structure—acting as the primary "mezzanine" buffer between the core equity and senior debt in a highly leveraged, capital-intensive utility, but not the dominant or sole source of structural capital.

<answer>50%</answer>