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Share-Based Payments - Schedule of Compensation Payable to BHES (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Share-Based Payment Arrangement [Abstract]
Compensation Cost Incurred To Date	$ 22,387
Remaining Compensation Cost	4,958
Total Compensation Cost	$ 27,345

X

- Definition

Share-Based Payment Arrangement, Nonvested Award, Compensation Cost

+ References

No definition available.

+ Details

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Namespace Prefix:	npwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Share-Based Payment Arrangement, Nonvested Award, Cost Incurred To Date, Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	npwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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