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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
TRA liability	$ 9,376	$ 0

X

- Definition

Tax Receivable Agreement, Liability

+ References

No definition available.

+ Details

Name:	npwr_TaxReceivableAgreementLiability
Namespace Prefix:	npwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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