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Shareholders' capital | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Shareholders' capital | Shareholders’ capital
(a) | Common shares
Number of common shares:
|  | 2017 |  | 2016
Common shares, beginning of year |  | 274,087,018 |  |  | 255,869,419 |
Public offering (i) and subscription receipts (ii) |  | 43,470,000 |  |  | 12,938,457 |
Conversion of convertible debentures (note 14) |  | 108,370,081 |  |  | — |
Dividend reinvestment plan (iii) |  | 3,905,848 |  |  | 2,322,618 |
Exercise of share-based awards (c) |  | 1,932,988 |  |  | 2,956,524 |
Common shares, end of year |  | 431,765,935 |  |  | 274,087,018 |
Authorized APUC is authorized to issue an unlimited number of common shares. The holders of the common shares are entitled to dividends if, as and when declared by the Board of Directors (the “Board”); to one vote per share at meetings of the holders of common shares; and upon liquidation, dissolution or winding up of APUC to receive pro rata the remaining property and assets of APUC, subject to the rights of any shares having priority over the common shares. The Company has a shareholders’ rights plan (the “Rights Plan”) which expires in 2019. Under the Rights Plan, one right is issued with each issued share of the Company. The rights remain attached to the shares and are not exercisable or separable unless one or more certain specified events occur. If a person or group acting in concert acquires 20 percent or more of the outstanding shares (subject to certain exceptions) of the Company, the rights will entitle the holders thereof (other than the acquiring person or group) to purchase shares at a 50 percent discount from the then current market price. The rights provided under the Rights Plan are not triggered by any person making a “Permitted Bid”, as defined in the Rights Plan. (i)Public offering On November 10, 2017, APUC issued 43,470,000 common shares at $13.25 per share pursuant to a public offering for proceeds of $576,000 before issuance costs of $24,342 or $17,895 net of taxes.
(ii) | Subscription receipts
On December 29, 2014, the Company received total proceeds of $77,503 from the issuance to Emera Inc. (“Emera”) of 8,708,170 subscription receipts at a price of $8.90 per share in connection with the Odell SponsorCo investment (note 8(c)). Effective June 30, 2016, Emera converted the subscription receipts for no additional consideration on a one-for-one basis into common shares and received 661,693 additional common shares in lieu of dividends declared during the holding period.
15. | Shareholders’ capital (continued)
(a) | Common shares (continued)
(ii) | Subscription receipts (continued)
On December 29, 2014, the Company received total proceeds of $33,000 from the issuance to Emera of 3,316,583 subscription receipts at a price of $9.95 per share in connection with the Park Water System acquisition (note 3(i)). Effective June 30, 2016, Emera converted the subscription receipts for no additional consideration on a one-for-one basis into common shares and received 252,011 additional common shares in lieu of dividends declared during the holding period.
(iii) | Dividend reinvestment plan
The Company has a common shareholder dividend reinvestment plan, which provides an opportunity for shareholders to reinvest dividends for the purpose of purchasing common shares. Additional common shares acquired through the reinvestment of cash dividends are purchased in the open market or are issued by APUC at a discount of up to 5% from the average market price, all as determined by the Company from time to time. Subsequent to year-end, APUC issued an additional 1,063,572 common shares under the dividend reinvestment plan.
(b) | Preferred shares
APUC is authorized to issue an unlimited number of preferred shares, issuable in one or more series, containing terms and conditions as approved by the Board. The Company has the following Series A and Series D preferred shares issued and outstanding as at December 31, 2017 and 2016:
Preferred shares | Number of shares |  | Price per share |  | Carrying amount
Series A | 4,800,000 |  |  | $ | 25 |  |  | $ | 116,546 |
Series D | 4,000,000 |  |  | $ | 25 |  |  | 97,259 |
|  |  |  |  | $ | 213,805 |
The holders of Series A and Series D preferred shares are entitled to receive fixed cumulative preferential dividends as and when declared by the Board at an annual amount of $1.125 and $1.25 per share, respectively, for each year up to, but excluding December 31, 2018 and March 31, 2019, respectively. The Series A and Series D dividend rate will reset on those dates and every five years thereafter at a rate equal to the then five-year Government of Canada bond yield plus 2.94% and 3.28%, respectively. The Series A and Series D preferred shares are redeemable at $25 per share at the option of the Company on December 31, 2018 and March 31, 2019, respectively, and every fifth year thereafter. The holders of Series A and Series D preferred shares have the right to convert their shares into cumulative floating rate preferred shares, Series B and Series E, respectively, subject to certain conditions, on December 31, 2018 and March 31, 2019, respectively, and every fifth year thereafter. The Series B and Series E preferred shares will be entitled to receive quarterly floating-rate cumulative dividends, as and when declared by the Board, at a rate equal to the then ninety-day Government of Canada treasury bill yield plus 2.94% and 3.28%, respectively. The holders of Series B and Series E preferred shares will have the right to convert their shares back into Series A and Series D preferred shares on December 31, 2018 and March 31, 2019, respectively and every fifth year thereafter. The Series A, Series B, Series D and Series E preferred shares do not have a fixed maturity date and are not redeemable at the option of the holders thereof. The Company has 100 redeemable Series C preferred shares issued and outstanding. The mandatorily redeemable Series C preferred shares are recorded as a liability on the consolidated balance sheets as they are mandatorily redeemable for cash (note 11).
15. | Shareholders’ capital (continued)
(c) | Share-based compensation
For the year ended December 31, 2017, APUC recorded $10,804 (2016 - $5,675) in total share-based compensation expense detailed as follows:
| 2017 |  | 2016
Share options | $ | 3,990 |  |  | $ | 3,006 |
Directors deferred share units | 771 |  |  | 683 |
Employee share purchase | 568 |  |  | 238 |
Performance share units | 5,475 |  |  | 1,748 |
Total share-based compensation | $ | 10,804 |  |  | $ | 5,675 |
The compensation expense is recorded as part of administrative expenses in the consolidated statements of operations. The portion of share-based compensation costs capitalized as cost of construction is insignificant. As of December 31, 2017, total unrecognized compensation costs related to non-vested options and PSUs were $2,796 and $8,471, respectively, and are expected to be recognized over a period of 1.61 and 1.84 years, respectively.
(i) | Share option plan
The Company’s share option plan (the “Plan”) permits the grant of share options to key officers, directors, employees and selected service providers. The aggregate number of shares that may be reserved for issuance under the Plan must not exceed 8% of the number of shares outstanding at the time the options are granted. The number of shares subject to each option, the option price, the expiration date, the vesting and other terms and conditions relating to each option shall be determined by the Board from time to time. Dividends on the underlying shares do not accumulate during the vesting period. Option holders may elect to surrender any portion of the vested options which is then exercisable in exchange for the “In-the-Money Amount”. In accordance with the Plan, the “In-The-Money Amount” represents the excess, if any, of the market price of a share at such time over the option price, in each case such “In-the-Money Amount” being payable by the Company in cash or shares at the election of the Company. As the Company does not expect to settle these instruments in cash, these options are accounted for as equity awards. In the case of qualified retirement, the Board may accelerate the vesting of the unvested options then held by the optionee at the Board’s discretion. All vested options may be exercised within ninety days after retirement. In the case of death, the options vest immediately and the period over which the options can be exercised is one year. In the case of disability, options continue to vest and be exercisable in accordance with the terms of the grant and the provisions of the plan. Employees have up to thirty days to exercise vested options upon resignation or termination. In the event that the Company restates its financial results, any unpaid or unexercised options may be cancelled at the discretion of the Board (or the compensation committee of the Board (“Compensation Committee”)) in accordance with the terms of the Company's clawback policy. The estimated fair value of options, including the effect of estimated forfeitures, is recognized as expense on a straight-line basis over the options’ vesting periods while ensuring that the cumulative amount of compensation cost recognized at least equals the value of the vested portion of the award at that date. The Company determines the fair value of options granted using the Black-Scholes option-pricing model. The risk-free interest rate is based on the zero-coupon Canada Government bond with a similar term to the expected life of the options at the grant date. Expected volatility was estimated based on the adjusted historical volatility of the Company’s shares. The expected life was based on experience to-date. The dividend yield rate was based upon recent historical dividends paid on APUC shares.
15. | Shareholders’ capital (continued)
(c) | Share-based compensation (continued)
(i) | Share option plan (continued)
The following assumptions were used in determining the fair value of share options granted:
| 2017 |  | 2016
Risk-free interest rate | 1.4 | % |  | 0.9 | %
Expected volatility | 25 | % |  | 23 | %
Expected dividend yield | 4.3 | % |  | 4.5 | %
Expected life | 5.50 years |  |  | 5.50 years |
Weighted average grant date fair value per option | $ | 1.45 |  |  | $ | 1.26 |
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 at January 1, 2016 | 7,164,652 |  |  | $ | 6.92 |  |  | 4.74 |  | $ | 28,561 |
Granted | 2,596,025 |  |  | 10.85 |  |  | 8.00 |  | — |
Exercised | (3,715,663 | ) |  | 5.25 |  |  | 2.06 |  | 20,790 |
Balance at December 31, 2016 | 6,045,014 |  |  | $ | 9.64 |  |  | 6.27 |  | $ | 10,595 |
Granted | 2,328,343 |  |  | 12.82 |  |  | 8.00 |  |  |
Exercised | (1,634,501 | ) |  | 7.81 |  |  | 3.76 |  | 7,696 |
Balance at December 31, 2017 | 6,738,856 |  |  | $ | 11.18 |  |  | 6.32 |  | $ | 19,380 |
Exercisable at December 31, 2017 | 2,448,689 |  |  | $ | 10.03 |  |  | 5.61 |  | $ | 9,473,719 |
(ii) | Employee share purchase plan
Under the Company’s employee share purchase plan (“ESPP”), eligible employees may have a portion of their earnings withheld to be used to purchase the Company’s common shares. The Company will match (a) 20% of the employee contribution amount for the first five thousand dollars per employee contributed annually and 10% of the employee contribution amount for contributions over five thousand dollars up to ten thousand dollars annually, for Canadian employees, and (b) 15% of the employee contribution amount for the first fifteen thousand dollar per employee contributed annually, for U.S. employees. Common shares purchased through the Company match portion shall not be eligible for sale by the participant for a period of one year following the contribution date on which such shares were acquired. At the Company’s option, the common shares may be (i) issued to participants from treasury at the average share price or (ii) acquired on behalf of participants by purchases through the facilities of the TSX by an independent broker. The aggregate number of common shares reserved for issuance from treasury by APUC under the ESPP shall not exceed 2,000,000 common shares. The Company uses the fair value based method to measure the compensation expense related to the Company’s contribution. For the year ended December 31, 2017, a total of 283,523 common shares (2016 - 144,264) were issued to employees under the ESPP.
15. | Shareholders’ capital (continued)
(c) | Share-based compensation (continued)
(iii) | Directors deferred share units
Under the Company’s Deferred Share Unit Plan, non-employee directors of the Company may elect annually to receive all or any portion of their compensation in DSUs in lieu of cash compensation. Directors’ fees are paid on a quarterly basis and at the time of each payment of fees, the applicable amount is converted to DSUs. A DSU has a value equal to one of the Company’s common shares. Dividends accumulate in the DSU account and are converted to DSUs based on the market value of the shares on that date. DSUs cannot be redeemed until the director retires, resigns, or otherwise leaves the Board. The DSUs provide for settlement in cash or shares at the election of the Company. As the Company does not expect to settle these instruments in cash, these options are accounted for as equity awards. As of December 31, 2017, 293,906 (2016 - 224,663) DSUs were outstanding pursuant to the election of the directors to defer a percentage of their director’s fee in the form of DSUs. The aggregate number of common shares reserved for issuance from treasury by APUC under the DSU Plan shall not exceed 1,000,000 common shares.
(iv) | Performance share units
The Company offers a PSU plan to its employees as part of the Company’s long-term incentive program. PSUs are granted annually for three-year overlapping performance cycles. PSUs vest at the end of the three-year cycle and will be calculated based on established performance criteria. At the end of the three-year performance periods, the number of common shares issued can range from 2.0% to 237% of the number of PSUs granted. Dividends accumulating during the vesting period are converted to PSUs based on the market value of the shares on that date and are recorded in equity as the dividends are declared. None of these PSUs have voting rights. Any PSUs not vested at the end of a performance period will expire. The PSUs provide for settlement in cash or shares at the election of the Company. As the Company does not expect to settle these instruments in cash, these options are accounted for as equity awards. The aggregate number of common shares reserved for issuance from treasury by APUC under the PSU Plan shall not exceed 7,000,000 common shares. Compensation expense associated with PSUs is recognized rateably over the performance period. Achievement of the performance criteria is estimated at the balance sheet date. Compensation cost recognized is adjusted to reflect the performance conditions estimated to-date. A summary of the PSUs follows:
| Number of awards |  | Weighted average grant-date fair value |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value
Balance at January 1, 2016 | 564,116 |  |  | $ | 7.59 |  |  | 1.63 |  |  | $ | 6,155 |
Granted, including dividends | 219,315 |  |  | 11.62 |  |  | 2.00 |  |  | — |
Exercised | (181,875 | ) |  | 8.29 |  |  | — |  |  | 2,115 |
Forfeited | (22,568 | ) |  | 9.64 |  |  | — |  |  | — |
Balance at December 31, 2016 | 578,988 |  |  | $ | 9.82 |  |  | 1.74 |  |  | $ | 6,595 |
Granted, including dividends | 811,974 |  |  | 13.54 |  |  | 2.00 |  |  | — |
Exercised | (374,973 | ) |  | 8.33 |  |  | — |  |  | 4,394 |
Forfeited | (60,961 | ) |  | 12.61 |  |  | — |  |  | — |
Balance at December 31, 2017 | 955,028 |  |  | $ | 12.30 |  |  | 1.84 |  |  | $ | 13,428 |
Exercisable at December 31, 2017 | 172,031 |  |  | $ | 9.75 |  |  | — |  |  | $ | 2,423 |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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