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Segment Reporting - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting [Abstract]
Asset optimization revenue	$ 27.3	$ 25.7
Asset optimization cost of revenues	$ 28.2	$ 25.8

X

- Definition

Asset Optimization, Cost of Revenues

+ References

No definition available.

+ Details

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Namespace Prefix:	spke_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Asset Optimization Revenue, Gross

+ References

No definition available.

+ Details

Name:	spke_AssetOptimizationRevenueGross
Namespace Prefix:	spke_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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