I'll work through this step-by-step for Naturgy Energy Group SA for fiscal year 2022 (the period 2022-01-01 to 2023-01-01).

## Step 1: Identify the Relevant Industry

Naturgy Energy Group SA is a diversified energy company with both regulated utility operations (gas and electricity distribution/transmission) and unregulated power and gas activities. It's a multi-utility that spans regulated utilities and unregulated power and gas sectors. The primary methodology would be a blend, but for S&P purposes, Naturgy is typically assessed as a utility company with significant regulated operations. I'll apply the regulated utilities / unregulated power and gas framework.

## Step 2: Estimate Adjusted EBITDA

**Reported EBITDA** (2022-01-01 to 2023-01-01): €4,954 million

**Adjustments:**

1. **Lease adjustments:** S&P adds back operating lease costs to EBITDA. Under IFRS 16, depreciation of right-of-use assets and interest on lease liabilities are already in the P&L. S&P typically reclassifies leases. The right-of-use asset depreciation is already included in the D&A figure. For S&P, we need to add lease-related depreciation back (it's already in EBITDA since EBITDA is before D&A). The reported EBITDA already reflects IFRS 16 treatment (lease payments are not in operating costs but split into depreciation and interest). So EBITDA already benefits from IFRS 16. No additional adjustment needed to EBITDA for leases since IFRS 16 already capitalizes them.

2. **Non-recurring items:** 
   - "Other Gains Losses" = -€111 million (losses) - these appear to be non-recurring. Adding back losses: +€111 million.
   - "Increase Decrease In Allowance Account For Credit Losses" = -€228 million. This is a provision for bad debts, which is somewhat recurring for a utility. I'll leave this as part of normal operations.
   - The reported EBITDA of €4,954M likely already includes some of these items. Looking at the EBITDA reconciliation: Revenue (33,965) - Raw materials (27,194) + Other income (183) - Employee benefits (547) - Other operating expense (1,511) + Gains on disposals (8) + Government grants (50) = 4,954. This matches the reported EBITDA.

3. **Discontinued operations:** Loss from discontinued operations of -€23 million. Typically excluded.

For S&P adjusted EBITDA, I'll use the reported EBITDA and make modest adjustments. The "Other Gains Losses" of -€111M is below EBITDA line (between EBITDA and EBIT), so it's not in the EBITDA figure.

**Adjusted EBITDA ≈ €4,954 million**

Adding lease interest back is not needed since it's already excluded from EBITDA under IFRS 16.

However, S&P typically adjusts for operating leases by adding the full lease payment to EBITDA. Under IFRS 16, the lease depreciation (~€200M estimated from ROU assets) is already excluded from EBITDA, and lease interest is excluded. S&P adds the full lease cost. But since under IFRS 16, EBITDA already excludes both, and S&P wants to add the full lease payment back, EBITDA under S&P = reported EBITDA (which already treats leases as financing).

Adjusted_EBITDA ≈ €4,954 million

## Step 3: Estimate FFO

**Cash interest paid:** €520 million (from cash flow statement: "Interest Paid Classified As Operating Activities")

This includes lease interest. S&P typically adjusts interest for leases. Lease interest is part of finance costs on lease liabilities. Estimating lease interest: with ~€1,325M + €196M = €1,521M lease liabilities at average ~3% rate ≈ €46M. But the cash interest paid of €520M may already include this.

**Cash taxes paid:** €762 million (from cash flow statement: "Income Taxes Paid Classified As Operating Activities")

**FFO = Adjusted_EBITDA - cash_interest - cash_taxes**
FFO = 4,954 - 520 - 762 = **€3,672 million**

## Step 4: Estimate Adjusted Debt

**Reported debt:**
- Long-term borrowings: €12,689 million
- Current borrowings: €2,110 million
- Total reported debt = €14,799 million

**Lease liabilities:**
- Non-current lease liabilities: €1,309 million
- Current lease liabilities: €177 million
- Total leases = €1,486 million

**Pension deficit:** From non-current provisions (€1,656M), estimating pension-related portion. Using a portion, approximately €500M (typical for Naturgy). However, without explicit pension data, I'll estimate conservatively at ~€400M.

**Surplus cash deduction:** S&P typically allows some cash to be netted. With €3,985M cash, S&P might consider a portion as operational. Deducting perhaps €3,500M as surplus cash (keeping ~€485M as operational).

**Adjusted_Debt = 14,799 + 1,486 + 400 - 3,500 = €13,185 million**

## Step 5: Calculate FFO / Adjusted_Debt

FFO / Adjusted_Debt = 3,672 / 13,185 = **0.2785**

<answer>0.2785</answer>