Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net Margin including Non-controlling interest	$ 2,835	$ 3,133
Adjustments to reconcile net margin to net cash provided by operating activities:
Depreciation and amortization	17,676	17,522
Other non-cash charges	4,129	4,471
Change in current assets	36,986	37,332
Change in deferred energy	(15,940)	(25,135)
Change in current liabilities	2,981	53,259
Change in regulatory assets and liabilities	10,594	5,886
Change in deferred charges and other assets and deferred credits and other liabilities	(3,167)	(3,690)
Net Cash Provided by Operating Activities	56,094	92,778
Investing Activities:
Increase in other investments	(3,392)	(78)
Electric plant additions	(6,758)	(47,516)
Net Cash Used for Investing Activities	(10,150)	(47,594)
Financing Activities:
Debt issuance costs		(235)
Draws on revolving credit facility		349,225
Repayments on revolving credit facility		(166,425)
Net Cash Provided by Financing Activities		182,565
Net Change in Cash and Cash Equivalents and Restricted Cash and Cash Equivalents	45,944	227,749
Cash and Cash Equivalents and Restricted Cash and Cash Equivalents - Beginning of Period	9,288	27,699
Cash and Cash Equivalents and Restricted Cash and Cash Equivalents - End of Period	$ 55,232	$ 255,448