Based on the provided data and S&P’s rating methodology, the recommendation for EDP, S.A. regarding hybrid bond issuance over the next 18 months is **0%** of total adjusted capital.

The reasoning is as follows:

1.  **Existing and Significant Hybrid Presence:** EDP has issued hybrid bonds since 2013 and had hybrids outstanding in 2021 and 2022. The facts state that S&P allows a maximum of 15% of total adjusted capital for equity credit. While the exact percentage of EDP’s current hybrid stock isn't provided, its long history and active use suggest it is likely already optimizing this aspect of its capital structure. The guidance explicitly notes that an entity's previous level is a strong indicator of the advisable level for the next 18 months.

2.  **Financial Profile and Metrics:** EDP's financial metrics for 2022 show a robust and improving profile, rather than one under severe stress that would necessitate pushing hybrid issuance to the limit.
    *   **Leverage and Coverage:** S&P Net Debt / EBITDA is 4.06x, and FFO / Net Debt is 18.84%. While not in the 'A' rating range, these metrics do not point to an entity facing "material downgrade risk" or needing to "substantially stabilize adjusted leverage trajectory." The Moody’s adjusted leverage trend is noted as "Improving."
    *   **Profitability and Growth:** Revenue grew significantly from 2021 to 2022 (€14.98B to €20.65B), and operating profit (before provisions, amortization, and financial items) grew from €3.72B to €4.52B. This demonstrates strong internal cash flow generation.
    *   **Market Conditions:** The cost of debt increased sharply between 2021 and 2022 (e.g., 10Y swap rate rose from an average of 0.05% to 1.93%), making new hybrid issuance considerably more expensive than the entity’s existing cost of debt. This directly aligns with the 0% guidance point: "Cost of hybrid will materially increase the current cost of debt."

3.  **Rating and Strategic Rationale:** The guidance for 0% includes "Strong rating profile, 'A' range, and no extraordinary capex needs" and "Low refinancing needs." While EDP is not necessarily 'A' rated, its financial health is stable and improving. There is no evidence of a "transformational capex/M&A program" or "material downgrade risk" that would force the company to issue expensive hybrid debt at the top of the 0%-15% range. The cash flow statement shows substantial operating cash flow (€3.78B) that largely covers investing outflows, limiting the desperate need for expensive capital.

Given that EDP is an experienced hybrid issuer that already manages this as a permanent part of its capital structure, and its current credit metrics are stable-to-improving in an environment of sharply rising rates, the rationale to *increase* hybrid debt significantly over the next 18 months is minimal. Pushing towards the 15% cap is unwarranted without a major, debt-funded acquisition. The most prudent advice aligns with the 0% (no further material issuance) or a very low level, but per the starting point and historical context, maintaining the status quo without adding a new, costly layer is optimal.

<answer>0%</answer>