RELATED-PARTY TRANSACTIONS - Amounts Due to Related Parties (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Due to related parties	$ 1,612,515	$ 1,375,049
Affiliated Entity | Coal Valley Properties, LLC
Related Party Transaction [Line Items]
Due to related parties	134,452	134,452
Affiliated Entity | Q Power LLC
Related Party Transaction [Line Items]
Due to related parties	500,000	500,000
Affiliated Entity | Coal Valley Sales, LLC
Related Party Transaction [Line Items]
Due to related parties	0	0
Affiliated Entity | Panther Creek Energy Services LLC
Related Party Transaction [Line Items]
Due to related parties	90,483	10,687
Affiliated Entity | Panther Creek Fuel Services LLC
Related Party Transaction [Line Items]
Due to related parties	687	53,482
Affiliated Entity | Northampton Generating Fuel Supply Company, Inc.
Related Party Transaction [Line Items]
Due to related parties	886,135	594,039
Affiliated Entity | Olympus Power LLC and other subsidiaries
Related Party Transaction [Line Items]
Due to related parties	758	78,302
Affiliated Entity | Scrubgrass Energy Services, LLC
Related Party Transaction [Line Items]
Due to related parties	0	4,087
Affiliated Entity | Scrubgrass Fuel Services, LLC
Related Party Transaction [Line Items]
Due to related parties	$ 0	$ 0