| Cover | 6 Months Ended |
| Jun. 30, 2023 | |
| Cover [Abstract] | |
| Document Type | 6-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 30, 2023 |
| Document Fiscal Period Focus | Q2 |
| Document Fiscal Year Focus | 2023 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 005-91913 |
| Entity Registrant Name | Fusion Fuel Green PLC |
| Entity Central Index Key | 0001819794 |
| Entity Address, Address Line One | The Victorians |
| Entity Address, Address Line Two | 15-18 Earlsfort Terrace |
| Entity Address, Address Line Three | Saint Kevin’s |
| Entity Address, City or Town | Dublin 2 |
| Entity Address, Country | IE |
| Entity Address, Postal Zip Code | D02 YX28 |
| Condensed consolidated statements of financial position (Unaudited) - EUR (€) € in Thousands | Jun. 30, 2023 | Dec. 31, 2022 |
| Non-current assets | ||
| Property, plant and equipment | € 28,755 | € 21,273 |
| Intangible assets | 5,184 | 5,350 |
| Total non-current assets | 33,939 | 26,623 |
| Current assets | ||
| Inventory | 19,292 | 22,336 |
| Prepayments and other receivables | 5,644 | 8,242 |
| Cash and cash equivalents | 3,085 | 8,164 |
| Total current assets | 28,021 | 38,742 |
| Total assets | 61,960 | 65,365 |
| Non-current liabilities | ||
| Trade and other payables - Leases | 9,745 | 7,651 |
| Deferred income | 5,642 | 2,925 |
| Total non-current liabilities | 15,387 | 10,576 |
| Current liabilities | ||
| Trade and other payables | 13,207 | 7,262 |
| Provisions | 8,403 | 8,403 |
| Deferred income | 1,375 | 186 |
| Cost accruals | 2,452 | 1,934 |
| Derivative financial instruments – warrants | 2,368 | 7,651 |
| Loans and borrowings | 414 | |
| Total current liabilities | 28,219 | 25,436 |
| Total liabilities | 43,606 | 36,012 |
| Net assets | 18,354 | 29,353 |
| Equity | ||
| Share capital | 2 | 2 |
| Share premium | 219,561 | 217,156 |
| Share-based payments reserve | 4,139 | 3,972 |
| Retained earnings | (205,348) | (191,777) |
| Total equity | € 18,354 | € 29,353 |
| Condensed consolidated statements of profit or loss and other comprehensive income (Unaudited) - EUR (€) € in Thousands | 6 Months Ended | |
| Jun. 30, 2023 | Jun. 30, 2022 | |
| Profit or loss [abstract] | ||
| Revenue | ||
| Cost of sales – raw materials | (7,298) | (660) |
| Gross profit | (7,298) | (660) |
| Operating expenses | ||
| Administration expenses | (10,814) | (6,980) |
| Share-based payment (expense)/credit | (1,207) | (1,755) |
| Operating loss | (19,319) | (9,395) |
| Net finance income | ||
| Finance income/(costs) | 37 | 338 |
| Interest receivable and similar income | 29 | 9 |
| Interest payable and similar expense | (277) | (16) |
| Derivative financial instruments at FVTPL | 5,283 | 1,694 |
| Net finance income/(costs) | 5,072 | 2,025 |
| Share of losses of equity-accounted investees | (205) | (282) |
| (Loss)/profit before tax | (14,452) | (7,652) |
| Income tax expense | (159) | (34) |
| Total comprehensive (loss)/income for the year | € (14,611) | € (7,686) |
| Basic (loss)/earnings per share | € (0.57) | € (0.54) |
| Diluted (loss)/earnings per share | € (0.57) | € (0.53) |
