Administrative expenses.

No definition available.

Name:	HTOO_AdministrativeExpenses
Namespace Prefix:	HTOO_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of all expenses directly or indirectly attributed to the goods or services sold. Attributed expenses include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, such as depreciation and maintenance of factory buildings and equipment used in the production process, unallocated production overheads, and abnormal amounts of production costs of inventories.

+ References

No definition available.

Schedule of impact on consolidated statement of profit or loss (Details) € / shares in Units, € in Thousands	12 Months Ended
	Dec. 31, 2025 $ / shares	Dec. 31, 2025 EUR (€) € / shares	Dec. 31, 2024 $ / shares	Dec. 31, 2024 EUR (€) € / shares	Dec. 31, 2023 $ / shares	Dec. 31, 2023 EUR (€) € / shares
ImpactOnConsolidatedStatementOfProfitLossLineItems [Line Items]
Revenue		€ 14,415		€ 1,605		€ 4,144
Cost of sales						(20,088)
Gross profit (loss)		4,180		437		(15,944)
Share-based payments expense		(1,562)		(2,189)		(1,393)
Impairment expense						(2,165)
Finance income / (costs)		2,485		230		6,451
Derivative financial instruments movements						6,886
Profit / (loss) on deconsolidation due to insolvency		1,225		1,846
(Loss) / profit before tax		(5,072)		(15,254)		(30,857)
Income tax expense		(92)		(470)		(159)
(Loss) / profit for the year		(4,980)		(15,279)		(31,016)
Other comprehensive income: exchange differences on translating foreign operations
Total comprehensive loss for the year		(7,269)		(15,279)		(31,016)
Loss attributable to owners of the parent		(5,720)		(15,300)
(Loss) / profit attributable to non-controlling interests
Total comprehensive (loss) / income attributable to non-controlling interests
Basic loss per shares \| (per share)			$ (29.05)		$ (74.11)	€ (74.11)
Diluted loss per shares \| (per share)			$ (29.05)		$ (74.11)	€ (74.11)
Cost of sales		(10,235)		(1,168)		€ (20,088)
Administration expenses		(11,696)		(16,460)		(15,835)
Net finance income / (costs)		(908)		(471)		€ 115
Previously stated [member]
ImpactOnConsolidatedStatementOfProfitLossLineItems [Line Items]
Revenue		14,415		1,605
Cost of sales		(10,240)
Gross profit (loss)		4,175		437
Other income / (expenses)		1,358		881
Administration expenses		(11,869)
Share-based payments expense		(1,562)		(2,189)
Impairment expense		(2)
Operating expenses		(7,898)		(17,181)
Finance income / (costs)		2,243		223
Interest payable and similar expense		(24)		(531)
Derivative financial instruments movements		3,392		627
Net finance income / (costs)		5,611
Profit / (loss) on deconsolidation due to insolvency		1,225		2,719
(Loss) / profit before tax		(1,062)		(13,706)
Income tax expense		110		(25)
(Loss) / profit for the year		(952)		(13,731)
Other comprehensive income: exchange differences on translating foreign operations
Total comprehensive loss for the year		(952)
Loss attributable to owners of the parent		(1,694)
(Loss) / profit attributable to non-controlling interests		742
Total comprehensive loss attributable to owners of the parent		(1,694)
Total comprehensive (loss) / income attributable to non-controlling interests		€ 742
Basic loss per shares \| € / shares		€ (1.27)
Diluted loss per shares \| € / shares		€ (1.27)
Cost of sales				(1,168)
Administration expenses				(15,873)
Operating loss before interest				(16,744)
Net finance income / (costs)				319
Increase (decrease) due to corrections of prior period errors [member]
ImpactOnConsolidatedStatementOfProfitLossLineItems [Line Items]
Revenue
Cost of sales		5
Gross profit (loss)		5
Other income / (expenses)
Administration expenses		173
Share-based payments expense
Impairment expense		(1,060)
Operating expenses		(884)		(586)
Finance income / (costs)		(3,126)		70
Interest payable and similar expense				6
Derivative financial instruments movements				(165)
Net finance income / (costs)		(3,126)
Profit / (loss) on deconsolidation due to insolvency				(873)
(Loss) / profit before tax		(4,010)		(1,548)
Income tax expense		(18)
(Loss) / profit for the year		(4,028)		(1,548)
Other comprehensive income: exchange differences on translating foreign operations		(2,289)
Total comprehensive loss for the year		(6,317)
Loss attributable to owners of the parent		(2,412)
(Loss) / profit attributable to non-controlling interests		(1,616)
Total comprehensive loss attributable to owners of the parent		(4,059)
Total comprehensive (loss) / income attributable to non-controlling interests		€ (2,258)
Basic loss per shares \| € / shares		€ (1.80)
Diluted loss per shares \| € / shares		€ (1.80)
Cost of sales
Administration expenses				(587)
Operating loss before interest				(586)
Net finance income / (costs)				(89)
Currently stated [member]
ImpactOnConsolidatedStatementOfProfitLossLineItems [Line Items]
Revenue		€ 14,415		1,605
Cost of sales		(10,235)		(1,168)
Gross profit (loss)		4,180		437
Other income / (expenses)		1,358		881
Administration expenses		(11,696)
Share-based payments expense		(1,562)		(2,189)
Impairment expense		(1,062)
Operating expenses		(8,782)		(17,767)
Finance income / (costs)		(883)		293
Interest payable and similar expense		(24)		(525)
Derivative financial instruments movements		3,392		462
Net finance income / (costs)		2,485
Profit / (loss) on deconsolidation due to insolvency		1,225		1,846
(Loss) / profit before tax		(5,072)		(15,254)
Income tax expense		92		(25)
(Loss) / profit for the year		(4,980)		(15,279)
Other comprehensive income: exchange differences on translating foreign operations		(2,289)
Total comprehensive loss for the year		(7,269)		(15,279)
Loss attributable to owners of the parent		(4,106)		(15,333)
(Loss) / profit attributable to non-controlling interests		(874)		54
Total comprehensive loss attributable to owners of the parent		(5,753)
Total comprehensive (loss) / income attributable to non-controlling interests		€ (1,516)		€ 54
Basic loss per shares \| (per share)	$ (3.07)	€ (3.07)		€ (29.05)
Diluted loss per shares \| (per share)	$ (3.07)	€ (3.07)		€ (29.05)
Cost of sales				€ (1,168)
Administration expenses		€ (11,696)		(16,460)
Operating loss before interest				(17,330)
Net finance income / (costs)				€ 230