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Revenue - Narrative (Details) customer in Millions		9 Months Ended
	Oct. 28, 2022 USD ($) term customer	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Prepayments received		$ 61,367,000		$ 54,678,000
Contract and contract acquisition costs		109,000	$ 129,000
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Disaggregation of Revenue [Line Items]
Agreement term	20 years
Number of agreement extensions | term	2
Agreement extension term	10 years
Total scheduled prepayments	$ 80,000,000
Prepayments received		$ 8,000,000
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Electricity
Disaggregation of Revenue [Line Items]
Number of customers | customer	3.7
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Natural Gas
Disaggregation of Revenue [Line Items]
Number of customers | customer	2.1

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