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STOCK OPTION AND STOCK UNIT PLANS | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
STOCK OPTION AND STOCK UNIT PLANS | STOCK OPTION AND STOCK UNIT PLANS We maintain four long-term incentive compensation plans: the ISO Plan, the Performance Stock Options (PSO) Plan, the PSU Plan and the RSU Plan. Total stock-based compensation expense recorded for the years ended December 31, 2020, 2019 and 2018 was $145 million, $117 million and $106 million, respectively. Disclosure of activity and assumptions for material stock-based compensation plans are included below. INCENTIVE STOCK OPTIONS Certain key employees are granted ISOs to purchase common shares at the grant date market price. ISOs vest in equal annual installments over a four-year period and expire 10 years after the issue date.
December 31, 2020 | Number | Weighted Average Exercise Price | Weighted Average Remaining Contractual Life (years) | Aggregate Intrinsic Value
(options in thousands; intrinsic value in millions of Canadian dollars; weighted average exercise price in Canadian dollars) |  |  |  |
Options outstanding at beginning of year | 35,047 |  | 47.73 |  |  |
Options granted | 4,783 |  | 55.50 |  |  |
Options exercised 1 | (2,656) |  | 37.12 |  |  |
Options cancelled or expired | (1,680) |  | 52.43 |  |  |
Options outstanding at end of year | 35,494 |  | 49.35 |  | 6.0 | 54 |
Options vested at end of year 2 | 22,005 |  | 48.65 |  | 4.6 | 34 |
1 The total intrinsic value of ISOs exercised during the years ended December 31, 2020, 2019 and 2018 was $13 million, $58 million and $42 million, respectively, and cash received on exercise was $4 million, $1 million and $15 million, respectively. 2 The total fair value of ISOs vested during the years ended December 31, 2020, 2019 and 2018 was $30 million, $32 million and $36 million, respectively. Weighted average assumptions used to determine the fair value of ISOs granted using the Black-Scholes-Merton option pricing model are as follows:
Year ended December 31, | 2020 | 2019 | 2018
Fair value per option (Canadian dollars)1 | 4.01 |  | 4.37 |  | 3.86 |
Valuation assumptions |  |  |
Expected option term (years)2 | 6 | 5 | 5
Expected volatility 3 | 18.3 | % | 19.9 | % | 21.9 | %
Expected dividend yield 4 | 5.9 | % | 6.1 | % | 6.4 | %
Risk-free interest rate 5 | 1.3 | % | 2.0 | % | 2.2 | %
1 Options granted to US employees are based on NYSE prices. The option value and assumptions shown are based on a weighted average of the US and the Canadian options. The fair values per option for the years ended December 31, 2020, 2019 and 2018 were $3.75, $4.04 and $3.75, respectively, for Canadian employees and US$3.62, US$4.09 and US$3.30, respectively, for US employees. 2 The expected option term is six years based on historical exercise practice and five years for retirement eligible employees. 3 Expected volatility is determined with reference to historic daily share price volatility and consideration of the implied volatility observable in call option values near the grant date. 4 The expected dividend yield is the current annual dividend at the grant date divided by the current stock price. 5 The risk-free interest rate is based on the Government of Canada’s Canadian Bond Yields and the US Treasury Bond Yields. Compensation expense recorded for the years ended December 31, 2020, 2019 and 2018 for ISOs was $24 million, $32 million and $28 million, respectively. As at December 31, 2020, unrecognized compensation expense related to non-vested stock-based compensation arrangements granted under the ISO Plan was $13 million. The expense is expected to be fully recognized over a weighted average period of approximately two years. PERFORMANCE STOCK UNITS Under PSU awards for certain key employees, cash awards are paid following a three-year performance cycle. Awards are calculated by multiplying the number of units outstanding at the end of the performance period by Enbridge's weighted average share price for 20 days prior to the maturity of the grant and by a performance multiplier. The performance multiplier ranges from zero, if our performance fails to meet threshold performance levels, to a maximum of two if we perform within the highest range of the performance targets. The performance multiplier is derived through a calculation of our Total Shareholder Return percentile rank, in each case relative to a specified peer group of companies and our distributable cash flow, adjusted for unusual, non-operating or non-recurring items, relative to targets established at the time of grant. To calculate the 2020 expense, a multiplier of 1.5 was used for 2020 PSU grants, 1.0 for 2019 PSU grants and 1.8 for the 2018 PSU grants.
December 31, 2020 | Number | Weighted Average Remaining Contractual Life (years) | Aggregate Intrinsic Value
(units in thousands; intrinsic value in millions of Canadian dollars) |  |  |
Units outstanding at beginning of year | 2,189 |  |  |
Units granted | 1,034 |  |  |
Units cancelled | (154) |  |  |
Units matured 1 | (219) |  |  |
Dividend reinvestment | 206 |  |  |
Units outstanding at end of year | 3,056 |  | 2.2 | 129 |
1 The total amount paid during the years ended December 31, 2020, 2019 and 2018 for PSUs was $14 million, $19 million and $18 million, respectively. Compensation expense recorded for the years ended December 31, 2020, 2019 and 2018 for PSUs was $76 million, $40 million and $15 million, respectively. As at December 31, 2020, unrecognized compensation expense related to non-vested PSUs was $46 million. The expense is expected to be fully recognized over a weighted average period of approximately two years. RESTRICTED STOCK UNITS Under RSU awards, cash awards are paid to certain of our employees following a 35-month maturity period. RSU holders receive cash equal to our weighted average share price for 20 days prior to the maturity of the grant multiplied by the units outstanding on the maturity date.
December 31, 2020 | Number | Weighted Average Remaining Contractual Life (years) | Aggregate Intrinsic Value
(units in thousands; intrinsic value in millions of Canadian dollars) |  |  |
Units outstanding at beginning of year | 1,624 |  |  |
Units granted | 1,281 |  |  |
Units cancelled | (87) |  |  |
Units matured 1 | (561) |  |  |
Dividend reinvestment | 196 |  |  |
Units outstanding at end of year | 2,453 |  | 2.5 | 104 |
1 The total amount paid during the years ended December 31, 2020, 2019 and 2018 for RSUs was $27 million, $34 million and $41 million, respectively. Compensation expense recorded for the years ended December 31, 2020, 2019 and 2018 for RSUs was $44 million, $41 million and $32 million, respectively. As at December 31, 2020, unrecognized compensation expense related to non-vested RSUs was $50 million. The expense is expected to be fully recognized over a weighted average period of approximately two years.

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