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Share-Based Payments - Schedule of Compensation Payable to BHES (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 08, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Compensation Cost Incurred To Date		$ 20,557
Remaining Compensation Cost	$ 3,300	6,788	$ 9,312
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_
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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

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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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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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