To estimate the S&P-adjusted FFO-to-debt ratio for ERG S.p.A. for the fiscal year ended December 31, 2022, we follow the workflow outlined below.

### Step 1: Identify the Relevant Industry

ERG S.p.A. is primarily engaged in the production of energy from renewable sources (wind, solar, hydro, biomass) and, historically, oil refining (though the refining business was divested in 2022, as indicated by the "Profit Loss From Discontinued Operations" and "Cash Flows From Losing Control Of Subsidiaries"). The remaining core business is renewable energy generation.

According to the provided methodologies:
*   **Regulated Utilities:** ERG operates in the renewable energy sector, which is typically merchant or supported by incentives/PPAs, not strictly regulated cost-of-service utilities.
*   **Oil And Gas Exploration And Production:** ERG has exited this sector (discontinued operations).
*   **Unregulated Power And Gas:** This sector covers renewable generation companies. The methodology states: "Unregulated power and gas companies, such as renewable generation companies... may benefit from policy support and gain competitive strength from fixed-price or feed-in tariffs, or from long-term contractual arrangements."

Therefore, the **Unregulated Power And Gas** industry methodology is the most appropriate. However, the calculation of FFO and Adjusted Debt generally follows the standard corporate baseline unless specific sector adjustments (like purchased power adjustments for integrated utilities or specific lease treatments) are mandated. The Unregulated Power and Gas section does not prescribe a unique FFO formula different from the standard corporate definition but emphasizes EBITDA margins and ROC for profitability. We will use the standard S&P Global Ratings corporate methodology definitions for FFO and Adjusted Debt, applying any specific adjustments found in the data (such as leases).

### Step 2: Estimate Adjusted EBITDA

The baseline formula is:
`Adjusted_EBITDA = EBITDA + adjustment_leases + nonrecurring_losses - nonrecurring_gains ± other_normalization_adjustments`

First, we determine the reported EBITDA. The report provides "Profit Loss From Operating Activities Before Interest Taxes Depreciation And Amortisation Expense" (EBITDA) directly.
*   **Reported EBITDA (2022):** 499,430,000 EUR

Next, we analyze adjustments:
1.  **Leases:** S&P typically adds back the interest portion of lease liabilities or treats lease liabilities as debt. In the FFO calculation, we subtract cash interest. In the Adjusted Debt calculation, we add lease liabilities. For EBITDA, reported EBITDA usually includes lease expenses (operating leases under IFRS 16 are depreciated and interest is below EBITDA, or if treated as operating, they are within EBITDA). Under IFRS 16, EBITDA is often higher than under IAS 17 because rent expense is replaced by depreciation and interest. The provided EBITDA figure is "Before Interest Taxes Depreciation And Amortisation". Under IFRS 16, depreciation of Right-of-Use (ROU) assets is added back to get to EBITDA. Interest on leases is below EBITDA. Therefore, the reported EBITDA is generally consistent with the S&P definition of EBITDA before lease interest adjustments. No specific add-back for "adjustment_leases" to EBITDA is typically required if EBITDA is already pre-interest and pre-depreciation/amortization, as the lease interest is handled in the FFO step (cash interest) and the principal/lease liability in the Debt step.
2.  **Non-recurring items:**
    *   **Impairment Loss Reversal:** The report shows "Impairment Loss Reversal Of Impairment Loss Recognised In Profit Or Loss Intangible Assets And Property Plant And Equipment" of 43,185,000 EUR. This is a gain included in the operating profit. S&P typically deducts non-recurring gains from EBITDA to normalize it.
    *   **Impairment Loss:** There is an "Impairment Loss Recognised In Profit Or Loss Trade Receivables" of 300,000 EUR. This is likely considered a recurring operating item or immaterial.
    *   **Discontinued Operations:** The EBITDA figure provided (499,430,000 EUR) is for "Operating Activities". We must verify if this includes discontinued operations. The "Profit Loss From Operating Activities" is 220,814,000 EUR. The "Profit Loss From Discontinued Operations" is 294,131,000 EUR. The sum is 514,945,000 EUR, which is close to the Net Profit. The EBITDA line item usually refers to continuing operations unless specified. Given the large divestment (Eni Refining & Marketing), the core business is renewables. We should focus on the continuing operations for a forward-looking rating metric, or adjust for the discontinued part if it's included. However, the line item "Profit Loss From Operating Activities Before Interest Taxes Depreciation And Amortisation Expense" is typically a subtotal from the continuing operations section of the income statement. Let's assume this EBITDA figure (499.43M) relates to continuing operations. The discontinued operations generated significant profit, but since they are sold, they are excluded from future FFO generation. Thus, we use the continuing operations EBITDA.
    *   **Adjustment for Impairment Reversal:** We subtract the non-recurring gain of 43,185,000 EUR.

    `Adjusted_EBITDA = 499,430,000 - 43,185,000 = 456,245,000 EUR`

    *Self-Correction/Refinement:* S&P often looks at "Core" EBITDA. The impairment reversal is a clear non-cash, non-recurring gain. Are there other items? "Other Income" is 12.6M. "Other Purchase Expense" is 15.1M. These seem operational. The large "Finance Income" of 75.6M is below EBITDA.

    Let's check if there are any other significant non-recurring items in the operating profit. The difference between EBITDA (499.43M) and Operating Profit (220.81M) is Depreciation (176.69M) + Amortization (58.74M) - Impairment Reversal (43.19M) + Impairment Loss (0.3M).
    499.43 - 176.69 - 58.74 + 43.19 - 0.3 = 306.89 M. This does not match the Operating Profit of 220.81M.
    Let's re-read the components.
    Operating Profit = EBITDA - Depreciation - Amortization + Impairment Reversals - Impairment Losses +/- Other operating items?
    499,430,000 - 176,689,000 - 58,741,000 + 43,185,000 - 300,000 = 306,885,000 EUR.
    The reported "Profit Loss From Operating Activities" is 220,814,000 EUR.
    The difference is 306,885,000 - 220,814,000 = 86,071,000 EUR.
    This difference might be due to other operating expenses or income not explicitly broken out in the provided tags, or perhaps the "EBITDA" line provided is not the exact sum of the components listed. However, we must trust the explicit "Profit Loss From Operating Activities Before Interest Taxes Depreciation And Amortisation Expense" tag as the starting EBITDA.

    Regarding the **Impairment Reversal**: It is a gain. We subtract it.
    Adjusted EBITDA = 499,430,000 - 43,185,000 = **456,245,000 EUR**.

### Step 3: Estimate FFO

The baseline formula is:
`FFO = Adjusted_EBITDA - cash_interest - cash_taxes`

1.  **Cash Interest:**
    The report provides "Finance Costs" of 112,195,000 EUR and "Finance Income" of 75,622,000 EUR.
    Net Finance Costs = 36,573,000 EUR.
    However, FFO requires *cash* interest paid.
    The Cash Flow statement shows "Interest Paid Classified As Financing Activities" of **29,146,000 EUR**.
    Note: Sometimes interest paid is classified as operating. Here it is explicitly classified as Financing. We use the cash amount paid.
    Cash Interest = 29,146,000 EUR.

2.  **Cash Taxes:**
    The Cash Flow statement shows "Income Taxes Paid Classified As Operating Activities" of **91,854,000 EUR**.

3.  **Calculation:**
    `FFO = 456,245,000 - 29,146,000 - 91,854,000`
    `FFO = 335,245,000 EUR`

    *Alternative Check:* Some definitions of FFO start from Net Income and add back D&A.
    Net Income from Continuing Operations = 88,966,000 EUR.
    Add: Depreciation (176,689,000) + Amortization (58,741,000) = 235,430,000.
    Less: Impairment Reversal (43,185,000) (since it was added to income, we remove it to normalize? Or rather, FFO adds back non-cash charges. Impairment reversal is a non-cash gain, so we subtract it).
    Adjusted Net Income proxy = 88,966,000 + 176,689,000 + 58,741,000 - 43,185,000 = 281,211,000.
    This differs from the EBITDA-based approach because of interest and taxes.
    FFO = EBITDA - Cash Interest - Cash Taxes is the standard S&P approximation when starting from EBITDA.
    Let's stick to the EBITDA derivation as it is more robust for "Adjusted" metrics.

    `FFO = 335,245,000 EUR`

### Step 4: Estimate Adjusted Debt

The baseline formula is:
`Adjusted_Debt = (reported_debt + leases + pension_deficit + guarantees + hybrid_debt_portion + other_debt_like_items) - eligible_cash`

1.  **Reported Debt:**
    We need to identify interest-bearing debt.
    From the Balance Sheet (2022-01-01 to 2023-01-01, ending balance at 2023-01-01 is usually used for ratio denominators in annual reports, or average. S&P typically uses year-end debt for the ratio with full-year FFO. Let's use the year-end 2022 balances (labeled 2023-01-01 in the data, which is the end of the 2022 fiscal year).

    *   **Noncurrent Financial Liabilities:**
        *   "Other Noncurrent Financial Liabilities": 1,751,255,000 EUR
        *   "Noncurrent Lease Liabilities": 150,955,000 EUR
        *   "Noncurrent Financial Liabilities At Fair Value Through Profit Or Loss": 0 EUR
    *   **Current Financial Liabilities:**
        *   "Other Current Financial Liabilities": 389,716,000 EUR
        *   "Current Financial Liabilities At Fair Value Through Profit Or Loss": 76,644,000 EUR
        *   "Current Lease Liabilities": 6,362,000 EUR

    Total Reported Debt (Gross) = 1,751,255,000 + 150,955,000 + 389,716,000 + 76,644,000 + 6,362,000
    Total Gross Debt = 2,374,932,000 EUR

2.  **Leases:**
    Lease liabilities are already included in the financial liabilities above (Current and Noncurrent Lease Liabilities). S&P treats lease liabilities as debt. So they are included in the 2,374,932,000 EUR.

3.  **Pension Deficit:**
    "Noncurrent Provisions For Employee Benefits": 3,723,000 EUR.
    S&P may add the underfunded portion of pension liabilities to debt. Without detailed actuarial data, we often use the provision on the balance sheet if it represents the deficit. However, for many European companies, this is small. We will include it as a debt-like item or assume it's negligible relative to the total. Let's add it to be conservative, or check if it's already in "provisions". It is a provision. S&P adjusts for the *underfunded* status. Lacking specific plan asset data, we might exclude it or include the provision. Given the small size (3.7M) vs billions in debt, it has minimal impact. We will exclude it for simplicity unless "pension_deficit" is explicitly distinct from the provision. Usually, the provision *is* the liability recognized. We'll leave it out of "Debt" strictly speaking, as it's a provision, but S&P adds *underfunded* pensions. Let's assume the provision equals the deficit for safety, adding 3,723,000.
    Adjusted Debt (pre-cash) = 2,374,932,000 + 3,723,000 = 2,378,655,000 EUR.

4.  **Eligible Cash:**
    S&P deducts cash and cash equivalents from debt.
    "Cash And Cash Equivalents": 392,811,000 EUR.
    Are there restrictions? The report doesn't specify restricted cash. We assume all cash is eligible for deduction.
    
    `Adjusted_Debt = 2,378,655,000 - 392,811,000 = 1,985,844,000 EUR`

    *Refinement on Debt Components:*
    Let's double-check "Other Current Financial Liabilities" (389.7M) and "Other Noncurrent Financial Liabilities" (1,751.2M). These likely contain bank loans and bonds.
    "Current Financial Liabilities At Fair Value" (76.6M) and "Noncurrent... At Fair Value" (0) are likely derivatives or specific instruments. If they are debt instruments marked to fair value, they are debt. If they are derivatives, they might not be. However, "Financial Liabilities" usually implies debt. Given the magnitude, we include them.
    
    Let's re-verify the "Lease" inclusion.
    Noncurrent Lease Liabilities: 150,955,000
    Current Lease Liabilities: 6,362,000
    Total Leases: 157,317,000.
    These are part of the "Other... Financial Liabilities" or separate? The tags list them separately.
    "Other Noncurrent Financial Liabilities" is 1,751,255,000.
    "Noncurrent Lease Liabilities" is 150,955,000.
    These are separate line items. So summing them is correct.

    Total Debt = 
    Noncurrent: 1,751,255,000 (Other) + 150,955,000 (Leases) = 1,902,210,000
    Current: 389,716,000 (Other) + 76,644,000 (FV) + 6,362,000 (Leases) = 472,722,000
    Total Gross Debt = 2,374,932,000 EUR.

    Add Pension Deficit: 3,723,000 EUR.
    Total Adjusted Gross Debt = 2,378,655,000 EUR.

    Less Cash: 392,811,000 EUR.
    Net Adjusted Debt = 1,985,844,000 EUR.

### Step 5: Calculate FFO / Adjusted Debt

`FFO = 335,245,000 EUR`
`Adjusted_Debt = 1,985,844,000 EUR`

`Ratio = 335,245,000 / 1,985,844,000`
`Ratio ≈ 0.168817`

Let's review the "Discontinued Operations" impact again.
The FFO calculated above uses EBITDA from continuing operations (assumed).
The Debt includes all debt of the entity at year-end. Since the refining business was sold ("Cash Flows From Losing Control Of Subsidiaries"), the debt associated with it should ideally be removed or netted against the proceeds if it was transferred. The balance sheet at 2023-01-01 reflects the post-divestment state. The "Liabilities Included In Disposal Groups Classified As Held For Sale" is 89,421,000 EUR at 2023-01-01? No, that's for 2023. At 2022-01-01 (start of year), it was 23,790,000. Wait, the divestment happened *during* 2022.
The balance sheet date "2023-01-01" is the end of the 2022 fiscal year.
At this date, the refining business is gone. The debt remaining (1.98B net) belongs to the renewable business.
The EBITDA (499M) is for the 2022 period. Did it include the refining business for the part of the year it was held?
"Profit Loss From Discontinued Operations" is 294M. This suggests the refining business contributed significantly to profit.
The "EBITDA" line item (499M) is typically "Continuing Operations" in IFRS statements when discontinued ops are presented separately. If the 499M included the refining business for the months it was held, it would be higher. However, standard presentation separates "Profit from discontinued operations" *after* operating profit from continuing operations. The tag "Profit Loss From Operating Activities Before Interest Taxes Depreciation And Amortisation Expense" usually aligns with Continuing Operations.
If the 499M EBITDA is *only* from continuing operations (Renewables), then the FFO of 335M is correct for the current asset base.
If the 499M EBITDA included the refining business (before it was classified as discontinued), we would need to subtract it. But IFRS requires restating prior periods or separating current period discontinued ops. The tag "Profit Loss From Discontinued Operations" exists, implying the Operating Profit (220M) and EBITDA (499M) are from **Continuing Operations**.
Therefore, the FFO (335M) corresponds to the Renewable business.
The Debt (1.98B) corresponds to the Renewable business (post-divestment).
This matching is consistent.

One check on Cash Interest:
Finance Costs: 112M.
Interest Paid: 29M.
The difference is huge. Why?
Perhaps the "Finance Costs" include non-cash items (amortization of debt issuance costs, fair value changes, etc.) or the interest was capitalized?
Or perhaps the "Interest Paid" in Cash Flow is only a portion?
Looking at "Finance Income" (75M) and "Finance Costs" (112M). Net is 36M.
Cash Flow from Financing: Interest Paid 29M.
This seems low relative to the debt of ~2.4B. 29M / 2.4B is ~1.2%. This is very low.
However, we must use the reported "Interest Paid" for the Cash Interest component of FFO.
Wait, let's look at "Adjustments For Finance Costs" in the Cash Flow from Operations section: 36,573,000 EUR. This matches the Net Finance Cost.
The Cash Flow statement shows "Interest Paid Classified As Financing Activities" as 29,146,000 EUR.
It is possible that some interest was paid in the previous year or accrued. Or perhaps the debt was lower on average during the year?
Start of year Debt (2022-01-01):
Noncurrent: 2,064M (Other) + 122M (Lease) + 44M (FV) = 2,230M
Current: 1,342M (Other) + 170M (FV) + 6M (Lease) = 1,518M
Total Gross Start Debt = 3,748M.
End of year Debt (2023-01-01): 2,375M.
The company repaid significant debt ("Repayments Of Noncurrent Borrowings" 350M, "Cash Flows From Used In Increase Decrease In Current Borrowings" -1,000M).
Average Debt might be around 3B.
Interest of 29M on 3B is still <1%.
However, "Finance Costs" are 112M.
If we use Accrued Interest (Finance Costs) instead of Cash Interest, FFO would be lower.
S&P definition: `FFO = Adjusted EBITDA - Cash Interest - Cash Taxes`.
We must use Cash Interest.
Is it possible "Interest Paid" is net of interest received?
"Finance Income" is 75M. "Interest Received" is not explicitly in the Cash Flow tags provided, but "Finance Income" is in P&L.
Usually, Interest Paid is gross.
Let's assume the provided "Interest Paid Classified As Financing Activities" is the correct cash interest outflow.

Recalculating with precision:
Adjusted EBITDA = 456,245,000
Cash Interest = 29,146,000
Cash Taxes = 91,854,000
FFO = 456,245,000 - 29,146,000 - 91,854,000 = 335,245,000

Adjusted Debt:
Gross Debt = 2,374,932,000
Pension = 3,723,000
Cash = 392,811,000
Net Debt = 2,374,932,000 + 3,723,000 - 392,811,000 = 1,985,844,000

Ratio = 335,245,000 / 1,985,844,000 = 0.168817...

Rounding to four decimal places: 0.1688

<answer>0.1688</answer>