Pay vs Performance Disclosure - USD ($)

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Pay vs Performance Disclosure

Pay vs Performance Disclosure, Table

Pay vs. Performance (“PvP”) Tabular Disclosure — 2023

As required by Section 953(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act, and Item 402(v) of Regulation S-K, we are providing the following information about the relationship between “compensation actually paid” (“CAP”) to our CEO and to our other NEOs and certain financial performance metrics of the Company. Compensation actually paid, as determined under SEC requirements, does not reflect the actual amount of compensation earned by or paid to our executive officers during a covered year. For further information concerning the Company’s pay-for-performance philosophy and how the Company aligns executive compensation with the Company’s performance, refer to the Compensation Discussion and Analysis.

	Pay								Performance
	CEO				Average of Other NEOs				Value of $100 Initial Investment Based On:
Year(1)	SCT Total Compensation		Compensation Actually Paid(2)		SCT Total Compensation		Compensation Actually Paid(2)		Cumulative TSR		Peer Group Cumulative TSR(3)		Net Income ($M)		EPS
2023	$	5,229,962	$	1,552,612	$	1,137,887	$	454,110	$	86	$	88	$	171.2	$	2.24
2022	$	4,745,379	$	5,290,632	$	1,318,402	$	1,605,440	$	104	$	103	$	155.2	$	2.12
2021	$	4,577,539	$	3,485,983	$	1,257,052	$	1,082,031	$	96	$	103	$	147.3	$	2.10
2020	$	5,004,033	$	2,234,759	$	1,173,361	$	241,559	$	87	$	86	$	129.5	$	1.90

1. The CEO in all four reporting years is Dennis Vermillion. The other NEOs in the 2023 reporting years are Mark Thies (ret.), Kevin Christie, Heather Rosentrater, Jason Thackston, and Wayne Manuel. The other NEOs in 2022 and 2021 reporting years were: Mark Thies (ret.), Jason Thackston, Heather Rosentrater, and Kevin Christie. The other NEOs in the 2020 reporting year are Mark Thies (ret.), Jason Thackston, Marian Durkin (ret.), Kevin Christie, and Heather Rosentrater.

2. Amounts reported in this column are based upon total compensation reported for our CEO and our other NEOs in the Summary Compensation Table for the indicated reporting years and adjusted as shown in the table below. Fair value of equity awards was computed in accordance with the Company’s methodology used for financial reporting purposes.

	2020						2021						2022						2023
	CEO			Other NEOs			CEO			Other NEOs			CEO			Other NEOs			CEO			Other NEOs
Summary Compensation Table Reported Compensation	$	5,004,033		$	1,173,361		$	4,577,539		$	1,257,052		$	4,745,379		$	1,318,402		$	5,229,962		$	1,137,887
Deduct: SCT reported change in pension value	$	(2,290,317	)	$	(335,308	)	$	(905,751	)	$	(170,893	)	$	—		$	—		$	(1,384,964	)	$	(155,884	)
Add: “CAP” pension value	$	985,475		$	73,716		$	6,658		$	118,549		$	3,813		$	115,378		$	804		$	35,117
Deduct: Grant date fair values of equity awards reported in “Stock Awards” column of the SCT for the covered FY	$	(1,778,775	)	$	(432,640	)	$	(1,986,445	)	$	(443,078	)	$	(2,923,157	)	$	(642,502	)	$	(2,728,537	)	$	(505,521	)
Deduct: For any awards granted in any prior FY forfeited during the covered FY, the fair value at the end of the prior FY	$	—		$	(10,089	)	$	—		$	—		$	—		$	—		$	—		$	(104,376	)
Add: Fair values as of the end of the covered FY of all equity awards granted during the covered FY outstanding and unvested as of the end of such covered FY	$	798,823		$	154,306		$	1,865,542		$	416,058		$	2,626,495		$	577,278		$	1,767,071		$	242,652
Add: The change in fair value (whether positive or negative) as of the end of the covered FY of any equity awards granted in any prior FY outstanding and unvested as of the end of such covered FY	$	(249,034	)	$	(176,959	)	$	(192,645	)	$	(63,103	)	$	268,274		$	61,234		$	(1,518,971	)	$	(240,617	)
Add: For awards granted and vested in the same FY, the fair value as of the vesting date	$	109,542		$	23,708		$	179,733		$	40,100		$	217,488		$	63,451		$	227,735		$	58,177
Add: The change in fair value (whether positive or negative) as of the vesting date of any awards granted in any prior FY for which all applicable vesting conditions were satisfied at the end of or during the covered FY	$	(410,431	)	$	(250,148	)	$	(197,784	)	$	(108,165	)	$	119,893		$	60,392		$	(183,866	)	$	(36,344	)
Add: The dollar value of any dividend equivalents or other earnings paid on stock or option awards in the covered FY prior to the vesting date not otherwise reflected in the fair value of such award	$	65,443		$	21,612		$	139,135		$	35,511		$	232,446		$	51,807		$	143,377		$	23,019
Total Compensation Actually Paid	$	2,234,759		$	241,559		$	3,485,983		$	1,082,031		$	5,290,632		$	1,605,440		$	1,552,612		$	454,110

3. Amounts reported in this column represent returns on an initial $100 investment in the S&P 400 Utilities Index, which we chose as peer group for purposes of the PvP table.

Company Selected Measure Name

EPS

Named Executive Officers, Footnote

1. The CEO in all four reporting years is Dennis Vermillion. The other NEOs in the 2023 reporting years are Mark Thies (ret.), Kevin Christie, Heather Rosentrater, Jason Thackston, and Wayne Manuel. The other NEOs in 2022 and 2021 reporting years were: Mark Thies (ret.), Jason Thackston, Heather Rosentrater, and Kevin Christie. The other NEOs in the 2020 reporting year are Mark Thies (ret.), Jason Thackston, Marian Durkin (ret.), Kevin Christie, and Heather Rosentrater.

Peer Group Issuers, Footnote

Amounts reported in this column represent returns on an initial $100 investment in the S&P 400 Utilities Index, which we chose as peer group for purposes of the PvP table.

PEO Total Compensation Amount

$ 5,229,962

$ 4,745,379

$ 4,577,539

$ 5,004,033

PEO Actually Paid Compensation Amount

$ 1,552,612

5,290,632

3,485,983

2,234,759

Adjustment To PEO Compensation, Footnote

2. Amounts reported in this column are based upon total compensation reported for our CEO and our other NEOs in the Summary Compensation Table for the indicated reporting years and adjusted as shown in the table below. Fair value of equity awards was computed in accordance with the Company’s methodology used for financial reporting purposes.

	2020						2021						2022						2023
	CEO			Other NEOs			CEO			Other NEOs			CEO			Other NEOs			CEO			Other NEOs
Summary Compensation Table Reported Compensation	$	5,004,033		$	1,173,361		$	4,577,539		$	1,257,052		$	4,745,379		$	1,318,402		$	5,229,962		$	1,137,887
Deduct: SCT reported change in pension value	$	(2,290,317	)	$	(335,308	)	$	(905,751	)	$	(170,893	)	$	—		$	—		$	(1,384,964	)	$	(155,884	)
Add: “CAP” pension value	$	985,475		$	73,716		$	6,658		$	118,549		$	3,813		$	115,378		$	804		$	35,117
Deduct: Grant date fair values of equity awards reported in “Stock Awards” column of the SCT for the covered FY	$	(1,778,775	)	$	(432,640	)	$	(1,986,445	)	$	(443,078	)	$	(2,923,157	)	$	(642,502	)	$	(2,728,537	)	$	(505,521	)
Deduct: For any awards granted in any prior FY forfeited during the covered FY, the fair value at the end of the prior FY	$	—		$	(10,089	)	$	—		$	—		$	—		$	—		$	—		$	(104,376	)
Add: Fair values as of the end of the covered FY of all equity awards granted during the covered FY outstanding and unvested as of the end of such covered FY	$	798,823		$	154,306		$	1,865,542		$	416,058		$	2,626,495		$	577,278		$	1,767,071		$	242,652
Add: The change in fair value (whether positive or negative) as of the end of the covered FY of any equity awards granted in any prior FY outstanding and unvested as of the end of such covered FY	$	(249,034	)	$	(176,959	)	$	(192,645	)	$	(63,103	)	$	268,274		$	61,234		$	(1,518,971	)	$	(240,617	)
Add: For awards granted and vested in the same FY, the fair value as of the vesting date	$	109,542		$	23,708		$	179,733		$	40,100		$	217,488		$	63,451		$	227,735		$	58,177
Add: The change in fair value (whether positive or negative) as of the vesting date of any awards granted in any prior FY for which all applicable vesting conditions were satisfied at the end of or during the covered FY	$	(410,431	)	$	(250,148	)	$	(197,784	)	$	(108,165	)	$	119,893		$	60,392		$	(183,866	)	$	(36,344	)
Add: The dollar value of any dividend equivalents or other earnings paid on stock or option awards in the covered FY prior to the vesting date not otherwise reflected in the fair value of such award	$	65,443		$	21,612		$	139,135		$	35,511		$	232,446		$	51,807		$	143,377		$	23,019
Total Compensation Actually Paid	$	2,234,759		$	241,559		$	3,485,983		$	1,082,031		$	5,290,632		$	1,605,440		$	1,552,612		$	454,110

Non-PEO NEO Average Total Compensation Amount

$ 1,137,887

1,318,402

1,257,052

1,173,361

Non-PEO NEO Average Compensation Actually Paid Amount

$ 454,110

1,605,440

1,082,031

241,559

Adjustment to Non-PEO NEO Compensation Footnote

2. Amounts reported in this column are based upon total compensation reported for our CEO and our other NEOs in the Summary Compensation Table for the indicated reporting years and adjusted as shown in the table below. Fair value of equity awards was computed in accordance with the Company’s methodology used for financial reporting purposes.

	2020						2021						2022						2023
	CEO			Other NEOs			CEO			Other NEOs			CEO			Other NEOs			CEO			Other NEOs
Summary Compensation Table Reported Compensation	$	5,004,033		$	1,173,361		$	4,577,539		$	1,257,052		$	4,745,379		$	1,318,402		$	5,229,962		$	1,137,887
Deduct: SCT reported change in pension value	$	(2,290,317	)	$	(335,308	)	$	(905,751	)	$	(170,893	)	$	—		$	—		$	(1,384,964	)	$	(155,884	)
Add: “CAP” pension value	$	985,475		$	73,716		$	6,658		$	118,549		$	3,813		$	115,378		$	804		$	35,117
Deduct: Grant date fair values of equity awards reported in “Stock Awards” column of the SCT for the covered FY	$	(1,778,775	)	$	(432,640	)	$	(1,986,445	)	$	(443,078	)	$	(2,923,157	)	$	(642,502	)	$	(2,728,537	)	$	(505,521	)
Deduct: For any awards granted in any prior FY forfeited during the covered FY, the fair value at the end of the prior FY	$	—		$	(10,089	)	$	—		$	—		$	—		$	—		$	—		$	(104,376	)
Add: Fair values as of the end of the covered FY of all equity awards granted during the covered FY outstanding and unvested as of the end of such covered FY	$	798,823		$	154,306		$	1,865,542		$	416,058		$	2,626,495		$	577,278		$	1,767,071		$	242,652
Add: The change in fair value (whether positive or negative) as of the end of the covered FY of any equity awards granted in any prior FY outstanding and unvested as of the end of such covered FY	$	(249,034	)	$	(176,959	)	$	(192,645	)	$	(63,103	)	$	268,274		$	61,234		$	(1,518,971	)	$	(240,617	)
Add: For awards granted and vested in the same FY, the fair value as of the vesting date	$	109,542		$	23,708		$	179,733		$	40,100		$	217,488		$	63,451		$	227,735		$	58,177
Add: The change in fair value (whether positive or negative) as of the vesting date of any awards granted in any prior FY for which all applicable vesting conditions were satisfied at the end of or during the covered FY	$	(410,431	)	$	(250,148	)	$	(197,784	)	$	(108,165	)	$	119,893		$	60,392		$	(183,866	)	$	(36,344	)
Add: The dollar value of any dividend equivalents or other earnings paid on stock or option awards in the covered FY prior to the vesting date not otherwise reflected in the fair value of such award	$	65,443		$	21,612		$	139,135		$	35,511		$	232,446		$	51,807		$	143,377		$	23,019
Total Compensation Actually Paid	$	2,234,759		$	241,559		$	3,485,983		$	1,082,031		$	5,290,632		$	1,605,440		$	1,552,612		$	454,110

Compensation Actually Paid vs. Total Shareholder Return

Compensation Actually Paid vs. Net Income

Compensation Actually Paid vs. Company Selected Measure

Total Shareholder Return Vs Peer Group

Tabular List, Table

Most Important Measures Linking Avista NEO Pay to Performance — 2023

The following are the most important financial and non-financial performance measures, as determined by the Company, that link compensation actually paid to our NEOs to the Company’s performance for the most recently completed fiscal year.

• EPS

• 3-Year Relative TSR

• Cost Per Customer

Total Shareholder Return Amount

$ 86

104

96

87

Peer Group Total Shareholder Return Amount

88

103

103

86

Net Income (Loss)

$ 171,200,000

$ 155,200,000

$ 147,300,000

$ 129,500,000

Company Selected Measure Amount

2.24

2.12

2.1

1.9

PEO Name

Dennis Vermillion

Measure:: 1

Pay vs Performance Disclosure

Name

EPS

Measure:: 2

Pay vs Performance Disclosure

Name

3-Year Relative TSR

Measure:: 3

Pay vs Performance Disclosure

Name

Cost Per Customer

PEO | SCT reported change in pension value [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ (1,384,964)

$ 0

$ (905,751)

$ (2,290,317)

PEO | "CAP" pension value [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

804

3,813

6,658

985,475

PEO | Grant date fair values of equity awards reported in "Stock Awards" column of the SCT for the covered FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(2,728,537)

(2,923,157)

(1,986,445)

(1,778,775)

PEO | For any awards granted in any prior FY forfeited during the covered FY, the fair value at the end of the prior FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

0

0

0

0

PEO | Fair values as of the end of the covered FY of all equity awards granted during the covered FY outstanding and unvested as of the end of such covered FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

1,767,071

2,626,495

1,865,542

798,823

PEO | The change in fair value (whether positive or negative) as of the end of the covered FY of any equity awards granted in any prior FY outstanding and unvested as of the end of such covered FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(1,518,971)

268,274

(192,645)

(249,034)

PEO | For awards granted and vested in the same FY, the fair value as of the vesting date [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

227,735

217,488

179,733

109,542

PEO | The change in fair value (whether positive or negative) as of the vesting date of any awards granted in any prior FY for which all applicable vesting conditions were satisfied at the end of or during the covered FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(183,866)

119,893

(197,784)

(410,431)

PEO | The dollar value of any dividend equivalents or other earnings paid on stock or option awards in the covered FY prior to the vesting date not otherwise reflected in the fair value of such award [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

143,377

232,446

139,135

65,443

Non-PEO NEO | SCT reported change in pension value [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(155,884)

0

(170,893)

(335,308)

Non-PEO NEO | "CAP" pension value [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

35,117

115,378

118,549

73,716

Non-PEO NEO | Grant date fair values of equity awards reported in "Stock Awards" column of the SCT for the covered FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(505,521)

(642,502)

(443,078)

(432,640)

Non-PEO NEO | For any awards granted in any prior FY forfeited during the covered FY, the fair value at the end of the prior FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(104,376)

0

0

(10,089)

Non-PEO NEO | Fair values as of the end of the covered FY of all equity awards granted during the covered FY outstanding and unvested as of the end of such covered FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

242,652

577,278

416,058

154,306

Non-PEO NEO | The change in fair value (whether positive or negative) as of the end of the covered FY of any equity awards granted in any prior FY outstanding and unvested as of the end of such covered FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(240,617)

61,234

(63,103)

(176,959)

Non-PEO NEO | For awards granted and vested in the same FY, the fair value as of the vesting date [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

58,177

63,451

40,100

23,708

Non-PEO NEO | The change in fair value (whether positive or negative) as of the vesting date of any awards granted in any prior FY for which all applicable vesting conditions were satisfied at the end of or during the covered FY [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(36,344)

60,392

(108,165)

(250,148)

Non-PEO NEO | The dollar value of any dividend equivalents or other earnings paid on stock or option awards in the covered FY prior to the vesting date not otherwise reflected in the fair value of such award [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ 23,019

$ 51,807

$ 35,511

$ 21,612