Acquisitions and Dispositions (Tables)

6 Months Ended

Jun. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Schedule of Asset Acquisitions

During the six months ended June 30, 2021, Southern Power acquired a controlling membership interest in the wind facility listed below. Acquisition-related costs were expensed as incurred and were not material.

Project Facility	Resource	Seller	Approximate Nameplate Capacity (MW)	Location	Southern Power Ownership Percentage	COD	PPA Contract Period
Deuel Harvest(*)	Wind	Invenergy Renewables, LLC	300	Deuel County, SD	100% of Class B	February 2021	25 years and 15 years

(*)On March 26, 2021, Southern Power acquired a controlling interest in the facility and consolidates the project's operating results in its financial statements. On March 30, 2021, Southern Power completed a tax equity transaction whereby it received $220 million. The tax equity partner, which is the Class A member, and Invenergy Renewables, LLC each own a noncontrolling interest.

Schedule of Construction Projects

Project Facility	Resource	Approximate Nameplate Capacity (MW)	Location	Actual/Expected COD	PPA Contract Period
Projects Under Construction at June 30, 2021
Garland Solar Storage(a)	Battery energy storage system	88	Kern County, CA	August 2021	20 years
Tranquillity Solar Storage(a)	Battery energy storage system	72	Fresno County, CA	Fourth quarter 2021	20 years
Glass Sands(b)	Wind	118	Murray County, OK	Fourth quarter 2021	12 years

(a)Subsequent to June 30, 2021, Southern Power further restructured its ownership in the Garland battery energy storage project and completed a tax equity transaction whereby it received initial proceeds of $11 million, while retaining the controlling interest. Prior to commercial operation, Southern Power expects to further restructure its ownership in the Tranquillity battery energy storage project and complete a tax equity transaction, but expects to retain the controlling interest. The ultimate outcome of this matter cannot be determined at this time.

(b)In December 2020, Southern Power purchased 100% of the membership interests of the Glass Sands facility.

Schedule of Assets Held for Sale

The following table provides the major classes of assets and liabilities classified as held for sale by Southern Company and Southern Company Gas at June 30, 2021 and/or December 31, 2020:

	Southern Company				Southern Company Gas
	At June 30,		At December 31,		At June 30,
	2021		2020		2021
	(in millions)
Assets Held for Sale:
Receivables – energy marketing	$	486	$	—	$	486
Natural gas for sale	90		—		90
Other current assets	76		—		76
Total property, plant, and equipment	11		8		5
Leveraged leases	45		52		—
Accumulated deferred income taxes	30		—		30
Other non-current assets	49		—		49
Total Assets Held for Sale	$	787	$	60	$	736
Liabilities Held for Sale:
Energy marketing trade payables	$	491	$	—	$	491
Other current liabilities	148		—		148
Other non-current liabilities	38		—		38
Total Liabilities Held for Sale	$	677	$	—	$	677