To estimate S&P's credit trend for VERBUND AG from 2021 to 2022, we follow the standard criteria for the "Unregulated Power And Gas" / "Regulated Utilities" industry. We compute the Adjusted EBITDA, Funds From Operations (FFO), and Adjusted Debt to determine the changes in the core credit metrics.

**Step 1: Identify the relevant industry**
VERBUND AG is an Austrian electricity utility with significant power generation (primarily hydropower) and grid operations. We apply the standard corporate and utility-specific adjustments to estimate its credit metrics.

**Step 2 & 3: Estimate 2021 Adjusted EBITDA and FFO**
* **Adjusted EBITDA:** We use the reported EBITDA, as it primarily reflects the clean operating performance before D&A and impairments.
  Reported EBITDA = 1,578,959,000 EUR
* **FFO:** Calculated by deducting cash interest and cash taxes from Adjusted EBITDA.
  Cash Interest Paid (Operating) = 17,900,000 EUR
  Cash Taxes Paid (Operating) = 238,200,000 EUR
  FFO = 1,578,959,000 - 17,900,000 - 238,200,000 = 1,322,859,000 EUR

**Step 4: Estimate 2021 Adjusted Debt**
For Adjusted Debt, we take the reported financial liabilities and subtract eligible cash. We explicitly exclude derivative financial liabilities as these represent energy trading/hedging positions, which grossed up due to European market conditions but are not classified as funded debt.
* Noncurrent Financial Liabilities = 1,834,155,000 EUR
* Current Financial Liabilities = 1,462,453,000 EUR
* Total Financial Debt = 3,296,608,000 EUR
* Less: Cash and Cash Equivalents = 318,562,000 EUR
  Adjusted Debt = 3,296,608,000 - 318,562,000 = 2,978,046,000 EUR

**Step 5 & 6: Calculate 2021 Credit Ratios**
* **Adjusted Debt / Adjusted EBITDA** = 2,978,046,000 / 1,578,959,000 = **1.89x**
* **FFO / Adjusted Debt** = 1,322,859,000 / 2,978,046,000 = **0.444 (44.4%)**

**Step 7 & 8: Estimate 2022 Adjusted EBITDA and FFO**
* **Adjusted EBITDA:** Driven by the historic spike in European power prices, VERBUND's revenues and margins surged.
  Reported EBITDA = 3,160,679,000 EUR
* **FFO:**
  Cash Interest Paid (Operating) = 36,100,000 EUR
  Cash Taxes Paid (Operating) = 343,100,000 EUR
  FFO = 3,160,679,000 - 36,100,000 - 343,100,000 = 2,781,479,000 EUR

**Step 9: Estimate 2022 Adjusted Debt**
* Noncurrent Financial Liabilities = 2,844,559,000 EUR
* Current Financial Liabilities = 1,109,297,000 EUR
* Total Financial Debt = 3,953,856,000 EUR
* Less: Cash and Cash Equivalents = 409,252,000 EUR
  Adjusted Debt = 3,953,856,000 - 409,252,000 = 3,544,604,000 EUR

**Step 10 & 11: Calculate 2022 Credit Ratios**
* **Adjusted Debt / Adjusted EBITDA** = 3,544,604,000 / 3,160,679,000 = **1.12x**
* **FFO / Adjusted Debt** = 2,781,479,000 / 3,544,604,000 = **0.785 (78.5%)**

**Step 12: Trend Classification**
* **Signal 1 (Leverage):** 1.12x - 1.89x = -0.77x. This reduction is well past the -0.2x threshold, indicating an *Improving* trend.
* **Signal 2 (Cash-flow coverage):** 0.785 - 0.444 = +0.341 (or +34.1 percentage points). This surpasses the +0.03 threshold, strongly indicating an *Improving* trend.

Both signals confirm a highly robust strengthening in the credit metrics, largely thanks to the outsized power margins from hydro-generation amidst Europe's 2022 energy crisis.

<answer>Improving</answer>