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Shareholders' capital (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Schedule of Number of Common Shares

Number of common shares 

						2021						2020
Common shares, beginning of year						597,142,219						524,223,323
Public offering						67,611,465						66,130,063
Dividend reinvestment plan						6,184,686						5,217,071
Exercise of share-based awards (c)						1,020,020						1,565,537
Conversion of convertible debentures						1,886						6,225
Common shares, end of year						671,960,276						597,142,219

Schedule of Shares Issued and Outstanding

The Company has the following preferred shares, Series A and preferred shares, Series D issued and outstanding as at December 31, 2021 and 2020:

Preferred shares			Number of shares						Price per share						Carrying amount C$						Carrying amount $
Series A			4,800,000						C$	25					C$	116,546					$	100,463
Series D			4,000,000						C$	25					C$	97,259					$	83,836
																					$	184,299

Schedule of Share-based Compensation Expense

For the year ended December 31, 2021, AQN recorded $8,395 (2020 - $24,637) in total share-based compensation expense as follows: 

			2021						2020
Share options			$	939					$	1,743
Director deferred share units			821						870
Employee share purchase			592						511
Performance and restricted share units			6,043						21,513
Total share-based compensation			$	8,395					$	24,637

Schedule of Fair Value of Share Options Granted

The following assumptions were used in determining the fair value of share options granted: 

			2021						2020
Risk-free interest rate			1.1		%				1.2		%
Expected volatility			23		%				24		%
Expected dividend yield			4.1		%				4.1		%
Expected life			5.50 years						5.50 years
Weighted average grant date fair value per option			C$	2.46					C$	2.72

Schedule of Stock Option Activity

Share option activity during the years is as follows: 

			Number of awards						Weighted average exercise price						Weighted average remaining contractual term (years)						Aggregate intrinsic value
Balance, January 1, 2020			3,523,912						C$	13.09					5.87						C$	18,609
Granted			999,962						16.78						7.27						—
Exercised			(2,386,275)						12.52						5.16						18,465
Forfeited			(27,151)						14.96						—						—
Balance, December 31, 2020			2,110,448						C$	15.45					6.55						C$	11,604
Granted			437,006						19.64						7.22						—
Exercised			(506,926)						13.92						5.95						1,453
Forfeited			—						—						—						—
Balance, December 31, 2021			2,040,528						C$	15.45					6.11						C$	3,145
Exercisable, December 31, 2021			1,398,668						C$	16.09					5.83						C$	3,247

Schedule of Performance Stock Units

A summary of the PSUs and RSUs follows: 

			Number of awards						Weighted average grant-date fair value						Weighted average remaining contractual term (years)						Aggregate intrinsic value
Balance, January 1, 2020			2,412,043						C$	14.00					1.86						C$	44,309
Granted, including dividends			1,313,171						19.31						2.00						24,966
Exercised			(968,470)						14.45						—						20,105
Forfeited			(35,537)						15.62						—						745
Balance, December 31, 2020			2,721,207						C$	16.58					0.93						C$	54,560
Granted, including dividends			805,433						19.94						2.77						12,881
Exercised			(865,067)						13.79						—						17,005
Forfeited			(217,901)						18.64						—						3,981
Balance, December 31, 2021			2,443,672						C$	18.07					1.72						C$	44,646
Exercisable, December 31, 2021			775,674						C$	16.12											C$	14,172

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