Hybrid bonds are hybrid instruments like convertible and other securities with features of equity and debt. From the provided data, Acciona SA’s balance sheet shows substantial noncurrent liabilities including long-term debt and noncurrent loans, but no explicit presentation of hybrid bonds. The equity section includes significant equity and noncontrolling interests, with no—indicated—preferred or hybrid securities. Given absence of hybrid instruments in the data and the sizable leverage evidenced by noncurrent liabilities around 8.467 billion and total liabilities with equity, there is no clear indication of reliance on hybrid bonds. Therefore, the prudent conclusion is to assign 0% reliance on hybrid bonds. 

<answer>0%</answer>