Based on the financial data and characteristics of Ørsted A/S, the company should be advised to utilize hybrid bonds at **11.25%** of its total adjusted capital for the next 18 months. 

**Reasoning:**
1. **High Capex Intensity:** Ørsted operates heavily in the unregulated power generation sector, particularly in capital-intensive offshore wind projects. The company's 2022 capital expenditure ("Purchase Of Property Plant And Equipment...") stood at an immense 33 billion DKK, which actually exceeds its EBITDA of roughly 32 billion DKK. Hybrids are heavily needed to fund this massive capital pipeline without sacrificing their balance sheet.
2. **Current Capital Structure:** As of the end of 2022, Ørsted had approximately 19.79 billion DKK in hybrid capital. Factoring in its total equity of 95.53 billion DKK and total borrowings/lease liabilities of roughly 71.55 billion DKK, its total adjusted capital evaluates to around 167 billion DKK. The proportion of hybrid capital in its capital structure currently represents ~11.8%, putting it squarely in the 11.25% bucket.
3. **Established Issuer:** Ørsted has actively used hybrids to defend its capital structure since 2005. During 2022 alone, it injected 3.69 billion DKK in new hybrid contributions while rolling over/repurchasing older issuances. This proves the instrument remains central to their ongoing strategy.
4. **Credit Metrics and Rating Cushion:** The 15% maximum limit is generally reserved for companies attempting to stave off a material downgrade risk or undergoing transformational M&A. With a healthy S&P FFO / Net Debt ratio of 0.31x, an S&P Net Debt / EBITDA ratio of 2.5x, and an improving leverage trajectory noted by Moody's, Ørsted shows no immediate signs of a downgrade risk. Its metrics denote solid Investment Grade preservation, effectively ruling out the desperation inherent to the 15% tier, while confirming that hybrid financing remains crucial for their leverage optimization.

<answer>11.25%</answer>