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Segment Reporting - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting [Abstract]
Asset optimization revenue	$ 22.6	$ 9.6	$ 68.4	$ 43.1
Asset optimization cost of revenues	$ 20.9	$ 9.9	$ 68.9	$ 43.6

X

- Definition

Asset Optimization, Cost of Revenues

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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