Revenue from Contracts with Customers

9 Months Ended

Sep. 30, 2022

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

Revenue from Contracts with Customers

Nature of Goods and Services

We provide retail electric and natural gas services to three primary customer classes. Our residential customers include single private dwellings and individual apartments. Our commercial customers consist primarily of main street businesses, and our industrial customers consist primarily of manufacturing and processing businesses that turn raw materials into products.

Electric Segment - Our regulated electric utility business primarily provides generation, transmission, and distribution services to customers in our Montana and South Dakota jurisdictions. We recognize revenue when electricity is delivered to the customer. Payments on our tariff-based sales are generally due 20-30 days after the billing date.

Natural Gas Segment - Our regulated natural gas utility business primarily provides production, storage, transmission, and distribution services to customers in our Montana, South Dakota, and Nebraska jurisdictions. We recognize revenue when natural gas is delivered to the customer. Payments on our tariff-based sales are generally due 20-30 days after the billing date.

Disaggregation of Revenue

The following tables disaggregate our revenue by major source and customer class (in millions):

	Three Months Ended
	September 30, 2022						September 30, 2021
	Electric		Natural Gas		Total		Electric		Natural Gas		Total
Montana	$	85.2	$	10.8	$	96.0	$	85.5	$	9.9	$	95.4
South Dakota	19.0		2.4		21.4		18.8		2.2		21.0
Nebraska	—		3.2		3.2		—		2.5		2.5
Residential	104.2		16.4		120.6		104.3		14.6		118.9
Montana	92.6		7.1		99.7		95.2		6.1		101.3
South Dakota	29.1		2.1		31.2		28.8		1.8		30.6
Nebraska	—		2.3		2.3		—		1.5		1.5
Commercial	121.7		11.5		133.2		124.0		9.4		133.4
Industrial	9.7		0.1		9.8		9.2		—		9.2
Lighting, governmental, irrigation, and interdepartmental	12.6		0.2		12.8		13.1		0.1		13.2
Total Customer Revenues	248.2		28.2		276.4		250.6		24.1		274.7
Other tariff and contract based revenues	22.3		8.6		30.9		26.9		8.7		35.6
Total Revenue from Contracts with Customers	270.5		36.8		307.3		277.5		32.8		310.3
Regulatory amortization and other	21.8		6.0		27.8		10.0		5.7		15.7
Total Revenues	$	292.3	$	42.8	$	335.1	$	287.5	$	38.5	$	326.0

	Nine Months Ended
	September 30, 2022						September 30, 2021
	Electric		Natural Gas		Total		Electric		Natural Gas		Total
Montana	$	252.9	$	91.7	$	344.6	$	251.4	$	82.4	$	333.8
South Dakota	55.0		31.7		86.7		51.0		18.7		69.7
Nebraska	—		26.0		26.0		—		14.6		14.6
Residential	307.9		149.4		457.3		302.4		115.7		418.1
Montana	263.4		48.9		312.3		266.6		42.9		309.5
South Dakota	83.2		23.0		106.2		77.0		12.6		89.6
Nebraska	—		16.0		16.0		—		7.7		7.7
Commercial	346.6		87.9		434.5		343.6		63.2		406.8
Industrial	28.4		0.9		29.3		28.1		0.7		28.8
Lighting, governmental, irrigation, and interdepartmental	25.4		1.4		26.8		26.8		1.0		27.8
Total Customer Revenues	708.3		239.6		947.9		700.9		180.6		881.5
Other tariff and contract based revenues	64.0		27.8		91.8		69.2		27.5		96.7
Total Revenue from Contracts with Customers	772.3		267.4		1,039.7		770.1		208.1		978.2
Regulatory amortization and other	35.1		(22.2)		12.9		28.9		17.9		46.8
Total Revenues	$	807.4	$	245.2	$	1,052.6	$	799.0	$	226.0	$	1,025.0