The company (EDP, S.A.) has experienced a significant increase in its debt levels. As of 2023-01-01, "Longterm Borrowings" stood at approximately 15.78 billion EUR, and "Current Borrowings" jumped to 4.24 billion EUR (up from 1.52 billion EUR in 2022). Furthermore, "Other Noncurrent Financial Liabilities" increased substantially from 3.04 billion EUR to 5.16 billion EUR. 

From a market perspective, swap rates (5Y, 7Y, 10Y) increased dramatically from 2021 to 2022 (e.g., the 10Y swap rate went from 0.053% to 1.927%). This environment of rising interest rates makes traditional debt financing more expensive and increases the financial burden of servicing interest payments, which already grew significantly from 875.8 million EUR in 2021 to 1.75 billion EUR in 2022.

Given the substantial rise in leverage and the interest rate environment, maintaining credit ratings is critical. Hybrid bonds, which provide equity-like characteristics for rating agency assessments while retaining debt-like tax advantages, offer a strategic buffer. However, excessive reliance on hybrids can become prohibitively expensive and signal distress. A 25% allocation to hybrid instruments within the capital structure is a prudent approach to optimize the weighted average cost of capital and support the credit profile without overly diluting current equity holders or creating an unsustainable fixed-cost burden in a volatile energy market.

<answer>25%</answer>