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Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2023

Derivative Instruments [Abstract]

Schedule of volume of GRE's outstanding contracts and options

Settlement Dates		Volume
		Electricity (in MWH)				Gas (in Dth)
Second quarter 2023			31,728				13,072
Third quarter 2023			45,056				—
Fourth quarter 2023			108,332				610,000
First quarter 2024			6,160				910,000
Second quarter 2024			—				—
Third quarter of 2024			16,592				—
Fourth quarter of 2024			—				—
First quarter of 2025			13,520				225,000
Second quarter of 2025			—				227,500
Third quarter of 2025			—				230,000
Fourth quarter of 2025			—				230,000
First quarter of 2026			—				—
Second quarter of 2026			—				—
Third quarter of 2026			3,520				—

Schedule of fair value of outstanding derivative instruments recorded as assets and liability

Asset Derivatives		Balance Sheet Location		March 31, 2023				December 31, 2022
				(in thousands)
Derivatives not designated or not qualifying as hedging instruments:
Energy contracts and options1		Other current assets		$	586			$	2,799
Energy contracts and options		Other assets			1,040				1,261
Total derivatives not designated or not qualifying as hedging instruments — Assets				$	1,626			$	4,060
Liability Derivatives		Balance Sheet Location		March 31, 2023				December 31, 2022
				(in thousands)
Derivatives not designated or not qualifying as hedging instruments:
Energy contracts and options1		Other current liabilities		$	3,444			$	1,800
Energy contracts and options		Other liabilities			115				1,057
Total derivatives not designated or not qualifying as hedging instruments — Liabilities				$	3,559			$	2,857

(1) The Company classifies derivative assets and liabilities as current based on the cash flows expected to be incurred within the following 12 months.

Schedule of derivative instruments on the consolidated statements of operations

				Amount of (Loss) Gain Recognized on Derivatives
Derivatives not designated or not qualifying as		Location of Gain Recognized		Three Months Ended March 31,
hedging instruments		on Derivatives			2023				2022
				(in thousands)
Energy contracts and options		Cost of revenues		$	(11,175	)		$	37,512

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Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4E
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624181-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

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- Definition

Tabular disclosure of the notional amounts of outstanding derivative positions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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- Definition

Tabular disclosure of derivative instrument not designated or qualifying as hedging instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959

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