To determine the extent to which Electricité de France (EDF) should utilize hybrid bonds relative to the S&P Global Ratings cap, we must analyze the company's financial position, specifically its leverage and equity buffer, in the context of the rating agency's methodology.

**1. Understanding the Constraint:**
S&P Global Ratings typically allows equity credit for hybrid instruments (like perpetual subordinated bonds) up to a maximum of 15% of "Total Adjusted Capital." Total Adjusted Capital is defined as Debt + Equity. The "equity credit" is the portion of the hybrid bond treated as equity for rating purposes. If a company issues hybrids exceeding this 15% threshold, the excess is treated entirely as debt, which negatively impacts leverage ratios and potentially the credit rating. Therefore, the strategic goal for a company seeking to optimize its capital structure while maintaining a strong credit profile is to utilize hybrids up to, but not exceeding, this cap to maximize the equity benefit without incurring excessive debt treatment penalties.

**2. Analyzing EDF's Financial Position (2022):**
*   **Equity Attributable to Owners of Parent:** €34,340 million (as of 2023-01-01, representing the end of the 2022 fiscal year).
*   **Noncontrolling Interests:** €12,272 million.
*   **Total Equity:** €46,612 million.
*   **Total Liabilities (Debt proxy):** Total Assets (€388,132 million) - Total Equity (€46,612 million) = €341,520 million.
*   **Total Adjusted Capital:** Debt + Equity = €341,520 million + €46,612 million = €388,132 million.

**3. Calculating the Hybrid Cap:**
*   **15% Cap of Total Adjusted Capital:** 0.15 * €388,132 million ≈ €58,220 million.
*   This means EDF could theoretically have up to €58,220 million in hybrid instruments treated with equity credit before hitting the cap.

**4. Assessing Current Hybrid Usage:**
*   The report lists "Other Noncurrent Financial Liabilities" and "Other Current Financial Liabilities," but does not explicitly break out the exact stock of hybrid bonds eligible for equity credit in the provided summary lines. However, we can look at the "Proceeds From Issue Of Subordinated Liabilities And Convertible Instruments" (€994 million in 2022) and "Payments To Holders Of Perpetual Subordinated Bonds" (€606 million in 2022).
*   More importantly, we look at the *strategy*. EDF is a capital-intensive utility with significant nuclear decommissioning provisions and high debt levels. The net loss in 2022 (-€17.9 billion attributable to owners) significantly eroded equity.
*   Despite the loss, the question asks about the *extent* to which the company *should* utilize hybrids relative to the cap. In corporate finance theory for rated entities, especially those with high leverage like utilities, maximizing the equity credit component of capital is crucial to de-leveraging the balance sheet from a rating perspective.
*   The options provided (0%, 25%, 50%, 75%, 100%) refer to the *utilization rate* of the allowed cap.
    *   **0%:** Implies avoiding hybrids entirely. This is suboptimal for a highly leveraged utility that benefits from the equity credit to improve leverage ratios.
    *   **100%:** Implies issuing hybrids exactly up to the 15% of Total Adjusted Capital limit. This maximizes the equity credit benefit, treating the maximum allowable amount as equity, which supports the credit rating by lowering reported leverage. Given EDF's high debt load and the need to fund energy transition and nuclear maintenance, optimizing the capital structure to get the best possible rating (and thus lower cost of debt) is a primary objective.
    *   **Intermediate values (25%, 50%, 75%):** These would imply leaving "equity credit capacity" on the table. Unless there is a specific constraint preventing issuance (e.g., market access, investor demand), a rational financial strategy for a company under rating agency scrutiny is to fill the bucket that provides the most rating benefit.

**5. Contextual Market Data:**
*   Swap curves and bond spreads rose significantly in 2022 (e.g., 10Y swap average went from -0.143% in 2020 to 1.927% in 2022). This increased the cost of all financing. However, hybrid bonds often offer a yield pickup over senior debt but are cheaper than pure equity.
*   The "Sub-Sen Delta" for iBoxx EUR Non-Financial IG increased, indicating wider spreads for subordinated debt. Despite higher costs, the *structural* benefit of equity credit for leverage ratios remains the dominant factor for rating-constrained utilities.

**Conclusion:**
For a company like EDF, which operates in a regulated, capital-intensive industry and is subject to strict credit rating constraints, the optimal strategy is to utilize the hybrid instrument allowance to its fullest extent permitted by the rating agency's equity credit cap. This maximizes the treated equity, thereby minimizing the leverage ratio used for rating purposes. Therefore, the company should aim to utilize 100% of the available cap.

<answer>100%</answer>