XML 72 R62.htm IDEA: XBRL DOCUMENT v3.23.3

Derivative Instruments (Details)	9 Months Ended
	Sep. 30, 2023
Electricity (in MWH) [Member] | Fourth quarter 2023
Derivative [Line Items]
Volume	789,300
Electricity (in MWH) [Member] | First quarter 2024
Derivative [Line Items]
Volume	13,040
Electricity (in MWH) [Member] | Second quarter 2024
Derivative [Line Items]
Volume
Electricity (in MWH) [Member] | Third quarter of 2024
Derivative [Line Items]
Volume	24,208
Electricity (in MWH) [Member] | Fourth quarter of 2024
Derivative [Line Items]
Volume
Electricity (in MWH) [Member] | First quarter of 2025
Derivative [Line Items]
Volume
Electricity (in MWH) [Member] | Second quarter of 2025
Derivative [Line Items]
Volume
Electricity (in MWH) [Member] | Third quarter of 2025
Derivative [Line Items]
Volume
Electricity (in MWH) [Member] | Fourth quarter of 2025
Derivative [Line Items]
Volume
Electricity (in MWH) [Member] | First quarter of 2026
Derivative [Line Items]
Volume
Electricity (in MWH) [Member] | Second quarter of 2026
Derivative [Line Items]
Volume
Electricity (in MWH) [Member] | Third quarter of 2026
Derivative [Line Items]
Volume	3,520
Gas (in Dth) [Member] | Fourth quarter 2023
Derivative [Line Items]
Volume	19,152
Gas (in Dth) [Member] | First quarter 2024
Derivative [Line Items]
Volume	1,137,500
Gas (in Dth) [Member] | Second quarter 2024
Derivative [Line Items]
Volume
Gas (in Dth) [Member] | Third quarter of 2024
Derivative [Line Items]
Volume
Gas (in Dth) [Member] | Fourth quarter of 2024
Derivative [Line Items]
Volume
Gas (in Dth) [Member] | First quarter of 2025
Derivative [Line Items]
Volume	225,000
Gas (in Dth) [Member] | Second quarter of 2025
Derivative [Line Items]
Volume	227,500
Gas (in Dth) [Member] | Third quarter of 2025
Derivative [Line Items]
Volume	230,000
Gas (in Dth) [Member] | Fourth quarter of 2025
Derivative [Line Items]
Volume	230,000
Gas (in Dth) [Member] | First quarter of 2026
Derivative [Line Items]
Volume
Gas (in Dth) [Member] | Second quarter of 2026
Derivative [Line Items]
Volume
Gas (in Dth) [Member] | Third quarter of 2026
Derivative [Line Items]
Volume

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Information that would enable users to understand the volume of the entity's derivative activity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

+ Details

Name:	us-gaap_DescriptionOfDerivativeActivityVolume
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=gne_ElectricityCommodityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesSevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesNineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesTenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesElevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesTwelveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesSeventeenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesThirteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesFourteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesFifteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gne_SettlementDatesAxis=gne_SettlementDatesSixteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=gne_NaturalGasReserveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: