Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Commitments [Line Items]

Estimated minimum long-term purchase commitments

Estimated total obligations under these commitments at December 31, 2017 were as follows:

	Operating Leases		Other
	(in millions)
2018	$	247	$	7
2019	250		6
2020	247		4
2021	249		5
2022	252		4
2023 and thereafter	806		38
Total	$	2,051	$	64

Expected future contractual obligations

Expected future contractual obligations for pipeline charges, storage capacity, and gas supply that are not recognized on the balance sheets as of December 31, 2017 were as follows:

	Pipeline Charges, Storage Capacity, and Gas Supply
	(in millions)
2018	$	813
2019	552
2020	416
2021	375
2022	339
2023 and thereafter	2,294
Total	$	4,789

Estimated minimum lease payments under operating leases

As of December 31, 2017, estimated minimum lease payments under operating leases were as follows:

	Minimum Lease Payments
	Barges & Railcars		Other(*)		Total
	(in millions)
2018	$	21	$	128	$	149
2019	11		113		124
2020	9		99		108
2021	8		87		95
2022	6		77		83
2023 and thereafter	5		963		968
Total	$	60	$	1,467	$	1,527

ALABAMA POWER CO

Commitments [Line Items]

Estimated minimum long-term purchase commitments

Total estimated minimum long-term obligations at December 31, 2017 were as follows:

	Operating Lease PPAs
	(in millions)
2018	$	41
2019	43
2020	44
2021	46
2022	47
2023 and thereafter	—
Total commitments	$	221

Estimated minimum lease payments under operating leases

As of December 31, 2017, estimated minimum lease payments under operating leases were as follows:

	Minimum Lease Payments(a)
	Affiliate Operating Leases(b)		Railcars		Vehicles & Other		Total
			(in millions)
2018	$	8	$	7	$	6	$	21
2019	10		7		5		22
2020	8		7		3		18
2021	7		6		1		14
2022	5		5		—		10
2023 and thereafter	16		4		—		20
Total	$	54	$	36	$	15	$	105

(a) Minimum lease payments have not been reduced by minimum sublease rentals of $3 million in the future.

GEORGIA POWER CO

Commitments [Line Items]

Estimated minimum lease payments under operating leases

As of December 31, 2017, estimated minimum lease payments under operating leases were as follows:

	Minimum Lease Payments
	Affiliate Operating Leases(a)		Non-Affiliate Operating Leases (b)		Total
	(in millions)
2018	$	10	$	14	$	24
2019	11		11		22
2020	11		9		20
2021	9		8		17
2022	8		6		14
2023 and thereafter	33		11		44
Total	$	82	$	59	$	141

(a) Includes operating leases for cellular tower space.

(b) Includes operating leases for cellular tower space, facilities, railcars, and other equipment.

Estimated long-term obligations

Estimated total long-term obligations at December 31, 2017 were as follows:

	Affiliate Capital Leases		Affiliate Operating Leases		Non-Affiliate Operating Leases		Vogtle Units 1 and 2 Capacity Payments		Total
	(in millions)
2018	$	23	$	62	$	127	$	7	$	219
2019	23		63		128		6		220
2020	23		65		124		4		216
2021	24		66		125		5		220
2022	24		67		126		4		221
2023 and thereafter	182		412		773		38		1,405
Total	$	299	$	735	$	1,403	$	64	$	2,501
Less: amounts representing executory costs(a)	45
Net minimum lease payments	254
Less: amounts representing interest(b)	120
Present value of net minimum lease payments	$	134

(a) Executory costs such as taxes, maintenance, and insurance (including the estimated profit thereon) are estimated and included in total minimum lease payments.

(b) Calculated using an adjusted incremental borrowing rate to reduce the present value of the net minimum lease payments to fair value.

GULF POWER CO

Commitments [Line Items]

Estimated minimum long-term purchase commitments

Estimated total minimum long-term commitments at December 31, 2017 were as follows:

	Operating Lease PPA
	(in millions)
2018	$	79
2019	79
2020	79
2021	79
2022	79
2023 and thereafter	33
Total	$	428

Estimated minimum lease payments under operating leases

Estimated total minimum lease payments under these operating leases at December 31, 2017 were as follows:

	Minimum Lease Payments
	Affiliate Operating Leases(a)		Non-Affiliate Operating Leases(b)		Total
	(in millions)
2018	$	2	$	7	$	9
2019	1		1		2
2020	1		1		2
2021	1		—		1
2022	1		—		1
2023 and thereafter	4		1		5
Total	$	10	$	10	$	20

MISSISSIPPI POWER CO

Commitments [Line Items]

Estimated minimum long-term purchase commitments

Estimated minimum lease payments under operating leases at December 31, 2017 were as follows:

	Affiliate Operating Leases(a)		Non-Affiliate Operating Lease(b)		Total
	(in millions)
2018	$	2	$	1	$	3
2019	2		1		3
2020	2		1		3
2021	2		—		2
2022	2		—		2
2023 and thereafter	7		—		7
Total	$	17	$	3	$	20

(a) Includes operating leases with affiliates primarily related to cellular towers.

(b) Primarily includes railcar and fuel handling equipment leases for Plant Daniel.

SOUTHERN Co GAS

Commitments [Line Items]

Expected future contractual obligations

Expected future contractual obligations for pipeline charges, storage capacity, and gas supply that are not recognized on the balance sheets as of December 31, 2017 were as follows:

	Pipeline Charges, Storage Capacity, and Gas Supply
	(in millions)
2018	$	813
2019	552
2020	416
2021	375
2022	339
2023 and thereafter	2,294
Total	$	4,789

Estimated minimum lease payments under operating leases

As of December 31, 2017, the Company's estimated minimum lease payments under operating leases were as follows:

	Minimum Lease Payments
	(in millions)
2018	$	17
2019	16
2020	16
2021	15
2022	13
2023 and thereafter	26
Total	$	103