To determine the extent to which the company should utilize hybrid bonds relative to the 15% equity credit cap, we evaluate the company's financial position and the environment for issuing hybrid instruments.

1.  **Capital Structure Analysis**: As of 2023-01-01, the company's Total Equity is 2,755,243,000 EUR. Its total financial liabilities include Noncurrent Financial Liabilities (4,722,263,000 EUR) and Current Financial Liabilities (619,418,000 EUR). Total debt is approximately 5,341,681,000 EUR. Total Adjusted Capital (Debt + Equity) is roughly 8,096,924,000 EUR.
2.  **Hybrid Capacity**: S&P limits hybrid equity credit to 15% of total adjusted capital. 15% of 8,096,924,000 EUR is approximately 1,214,538,600 EUR. The current debt load is significant, and the company carries high interest-bearing obligations (Interest Paid 114,121,000 EUR in 2022).
3.  **Market Environment**: Market data shows a sharp increase in swap rates in 2022 (e.g., 10Y swap average moved from 0.053% in 2021 to 1.927% in 2022) and an increase in the iBoxx non-financial IG credit spreads (from 1.298 to 2.295). This environment makes issuing new debt or hybrids increasingly expensive.
4.  **Strategic Positioning**: While the company has substantial assets (11.3 billion EUR), its net income has decreased from 352 million EUR in 2021 to 311 million EUR in 2022. Given the rising cost of capital and the company's existing debt profile, aggressively utilizing hybrid bonds to the full extent of the 15% limit could strain cash flows due to the higher coupon rates typically associated with hybrids compared to senior debt. However, a moderate utilization allows for capital optimization without overleveraging. Given the options provided, 25% of the allowable capacity represents a balanced approach that respects the S&P limit while mitigating the impact of the current unfavorable interest rate environment.

<answer>25%</answer>