I'll work through this step-by-step.

## Step 1: Identify the Relevant Industry

A2A S.p.A. is an Italian multi-utility company. The entity name is "A2A ENERGIA S.P.A." which is the energy/retail supply subsidiary, but the financial data provided appears to be consolidated group data for A2A S.p.A. (the parent). A2A operates in regulated utilities (networks, distribution) and unregulated power and gas (generation, retail supply). Given the mix, this is a multi-utility that spans both regulated utilities and unregulated power and gas sectors.

## Step 2: Estimate Adjusted Debt

**Reported Debt:**
- Noncurrent financial liabilities: €5,867M (as of Jan 1, 2023, i.e., end of FY2022)
- Current financial liabilities: €1,022M
- Total reported financial debt = 5,867 + 1,022 = €6,889M

**Pension deficit:**
- Noncurrent provisions for employee benefits: €248M

**Other debt-like items:**
- Other long-term provisions: €729M (these may include asset retirement obligations, environmental provisions, etc. S&P typically treats some provisions as debt-like, but not all. I'll be conservative and not add all of these as debt-like. However, S&P commonly adds asset retirement obligations. Without specific breakdown, I'll exclude the bulk of these.)

**Eligible cash to deduct:**
- S&P typically allows netting of some cash, but for utilities, they may not deduct all cash. A common approach is to deduct surplus cash beyond operating needs. For a large utility, operating cash needs might be around 2-3% of revenue. Revenue = €23,166M, so ~€460-695M operating cash needed.
- Cash = €2,584M. Surplus cash = 2,584 - 500 ≈ €2,084M. However, S&P is often conservative and may not deduct all surplus cash. A common approach is to leave some or deduct a modest portion. For utilities, S&P sometimes deducts minimal cash. I'll be conservative and not deduct cash (or deduct a small portion).
- Actually, S&P's typical approach for rated utilities is to not subtract much cash unless it's clearly ring-fenced. I'll assume no cash deduction for simplicity, which is the more conservative S&P default.

**Leases:**
- The data shows "Payments of Lease Liabilities" = €11M, suggesting relatively small lease obligations. The lease debt should already be on the balance sheet under IFRS 16 (included in financial liabilities). No additional adjustment needed.

**Adjusted Debt calculation:**
- Adjusted_Debt = 6,889 + 248 + 0 (no additional lease adjustment beyond what's on BS) - 0 (no cash deduction, conservative)
- Adjusted_Debt ≈ €7,137M

## Step 3: Estimate Adjusted EBITDA

**Reported EBITDA:** €1,505M

**Adjustments:**
- **Nonrecurring items:** "Result From Nonrecurring Transactions" = €157M (gain). S&P would typically remove nonrecurring gains.
  - Adjusted EBITDA should subtract this gain: -€157M
  
- **Pension adjustments:** S&P replaces pension service cost and interest with actual cash contributions. Without exact data, the adjustment is typically small. The pension provision decreased from €294M to €248M, and with OCI remeasurement of +€31M pre-tax, the cash contribution effect is modest. I'll approximate this as negligible.

- **Lease adjustments:** Under IFRS 16, depreciation of right-of-use assets and interest on lease liabilities are in D&A and finance costs. S&P adds back the full lease payment to EBITDA (which IFRS 16 already does by removing lease expense from operating costs). No further adjustment needed since EBITDA already excludes lease depreciation.

- **Discontinued operations gain:** €36M from discontinued operations is below EBITDA line, so no adjustment needed.

**Adjusted EBITDA:**
- Adjusted_EBITDA = 1,505 - 157 = €1,348M

## Step 4: Calculate the Ratio

Adjusted_Debt / Adjusted_EBITDA = 7,137 / 1,348 = 5.294

Rounding to two decimal places: 5.29

Let me reconsider whether to remove the nonrecurring gain. The €157M "Result from Nonrecurring Transactions" appears to be below EBIT (it's between EBIT and financial items in the P&L structure), meaning it may not be included in the reported EBITDA of €1,505M. Looking at the flow: Revenue - OpEx - Employee = EBITDA, then - D&A = EBIT (€687M). The €157M appears after EBIT. So EBITDA of €1,505M may already exclude it.

If so: Adjusted_EBITDA = €1,505M

Adjusted_Debt / Adjusted_EBITDA = 7,137 / 1,505 = 4.74

<answer>4.74</answer>