Step 1: Identify the relevant industry
HERA S.P.A. is an Italian multi-utility company (indicated by its name, sector classifications, and revenue scale). The provided industry methodologies include "Regulated Utilities," which encompasses Multi-utilities. Thus, we will use the Regulated Utilities methodology. Under this methodology, there are no specific modifications to the baseline formulas for Adjusted EBITDA, FFO, or Adjusted Debt, other than typical corporate adjustments and the fact that debt-like items such as leases and pension deficits need to be included in Adjusted Debt.

Step 2: Estimate Adjusted EBITDA
Using the baseline formula:
Adjusted_EBITDA = EBITDA (reported or reconstructed) + adjustment_leases + nonrecurring_losses - nonrecurring_gains ± pension_adjustments ± joint_venture_proportional_EBITDA ± other_normalization_adjustments

From the income statement, we can reconstruct EBITDA:
EBITDA = Profit Loss From Operating Activities + Amortisation Depreciation And Amortisation Expense And Impairment Loss Reversal = 533,800,000 EUR + 478,600,000 EUR = 1,012,400,000 EUR.
Alternatively, summing the expenses and other income: (20,082 + 548.2) - (16,730 + 2,105.8 + 601.1 + 74.9) - 82.5 + 667.1 + 10.0 = 1,012,400,000 EUR.

For lease adjustments: Under S&P criteria, operating leases are capitalized and added to EBITDA. The implied interest on the lease liability is added back. We estimate the lease interest as the difference between the operating lease expense and the depreciation of the right-of-use asset. 
Depreciation of right-of-use assets (2022) = Right-ofuse Assets (2022-01-01) - Rightofuse Assets (2023-01-01) = 101,600,000 - 84,200,000 = 17,400,000 EUR.
Implied Lease Interest = Total Lease Expense (estimated from Finance Costs and Repayments) - Depreciation of ROU Assets. 
Total lease expense ≈ Finance Costs Paid Classified As Operating Activities (128,000,000) + Payments Of Lease Liabilities Classified As Financing Activities (43,400,000) = 171,400,000 EUR.
Implied Lease Interest = 171,400,000 - 17,400,000 = 154,000,000 EUR.
Adjustment_leases to EBITDA = Implied Lease Interest = 154,000,000 EUR.

There are no explicit nonrecurring items or pension adjustments detailed in the data. Joint ventures are accounted for using the equity method, and we generally do not proportionally consolidate them for EBITDA unless specified. 
Adjusted_EBITDA = 1,012,400,000 + 154,000,000 = 1,166,400,000 EUR.

Step 3: Estimate FFO
Using the baseline formula:
FFO = Adjusted_EBITDA - cash_interest - cash_taxes

Cash Interest = Finance Costs Paid Classified As Operating Activities (128,000,000) + Payments Of Lease Liabilities Classified As Financing Activities (43,400,000) = 171,400,000 EUR.
Cash Taxes = Income Taxes Paid Classified As Operating Activities = 165,900,000 EUR.

FFO = 1,166,400,000 - 171,400,000 - 165,900,000 = 829,100,000 EUR.

Step 4: Estimate Adjusted Debt
Using the baseline formula:
Adjusted_Debt = (reported_debt + leases + pension_deficit + guarantees + hybrid_debt_portion + other_debt_like_items) - eligible_cash

Reported Debt = Noncurrent Financial Liabilities + Current Financial Liabilities = 5,689,900,000 + 650,100,000 = 6,340,000,000 EUR.
Leases = Noncurrent Lease Liabilities + Current Lease Liabilities = 55,100,000 + 21,300,000 = 76,400,000 EUR.
Pension deficit: Provisions for employee benefits (92,000,000 noncurrent) typically represent the net defined benefit liability in these statements, so we add 92,000,000 EUR.
Other debt-like items: No specific guarantees or hybrids listed.
Total Debt Adjustments = 6,340,000,000 + 76,400,000 + 92,000,000 = 6,508,400,000 EUR.

Eligible Cash = Cash And Cash Equivalents (1,942,400,000 EUR). We deduct this from the adjusted debt.
Adjusted_Debt = 6,508,400,000 - 1,942,400,000 = 4,566,000,000 EUR.

Step 5: Calculate the FFO / Adjusted_Debt ratio
FFO / Adjusted_Debt = 829,100,000 / 4,566,000,000 = 0.181557...

Rounding to four decimal places: 0.1816

<answer>0.1816</answer>