21.STOCK OPTION AND STOCK UNIT PLANS

The Company maintains four long-term incentive compensation plans: the ISO Plan, the PBSO Plan, the PSU Plan and the RSU Plan. A maximum of 60 million common shares were reserved for issuance under the 2002 ISO plan, of which 49 million have been issued to date. A further 71 million common shares have been reserved for issuance for the 2007 ISO and PBSO plans, of which eight million have been exercised and issued from treasury to date. The PSU and RSU plans grant notional units as if a unit was one Enbridge common share and are payable in cash.

INCENTIVE STOCK OPTIONS

Key employees are granted ISO to purchase common shares at the market price on the grant date. ISO vest in equal annual installments over a four-year period and expire 10 years after the issue date.

December 31, 2014	Number	Weighted Average Exercise Price	Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
(options in thousands; intrinsic value in millions of Canadian dollars)
Options outstanding at beginning of year	29,602	30.52
Options granted	5,963	48.80
Options exercised1	(3,973)	22.20
Options cancelled or expired	(262)	41.33
Options outstanding at end of year	31,330	34.97	6.6	523
Options vested at end of year2	16,591	27.25	5.2	405

The total intrinsic value of ISO exercised during the year ended December 31, 2014 was $117 million (2013 - $98 million; 2012 - $130 million) and cash received on exercise was $37 million (2013 - $24 million; 2012 - $69 million).

The total fair value of options vested under the ISO Plan during the year ended December 31, 2014 was $26 million (2013 - $22 million; 2012 - $19 million).

Weighted average assumptions used to determine the fair value of ISO granted using the Black-Scholes-Merton option pricing model are as follows:

Year ended December 31,	2014	2013	2012
Fair value per option (Canadian dollars)1	5.53	5.27	4.81
Valuation assumptions
Expected option term (years)2	5	5	5
Expected volatility3	16.9%	17.4%	19.7%
Expected dividend yield4	2.9%	2.8%	3.0%
Risk-free interest rate5	1.6%	1.2%	1.3%

Options granted to United States employees are based on New York Stock Exchange prices. The option value and assumptions shown are based on a weighted average of the United States and the Canadian options. The fair values per option were $5.45 (2013 - $5.15; 2012 - $4.65) for Canadian employees and US$5.35 (2013 - US$5.63; 2012 - US$5.58) for United States employees.

The expected option term is based on historical exercise practice.

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.

The expected dividend yield is the current annual dividend at the grant date divided by the current stock price.

The risk-free interest rate is based on the Government of Canada’s Canadian Bond Yields and the United States Treasury Bond Yields.

Compensation expense recorded for the year ended December 31, 2014 for ISO was $29 million (2013 - $27 million; 2012 - $23 million). At December 31, 2014, unrecognized compensation cost related to non-vested stock-based compensation arrangements granted under the ISO Plan was $42 million. The cost is expected to be fully recognized over a weighted average period of approximately two years.

PERFORMANCE BASED STOCK OPTIONS

PBSO are granted to executive officers and become exercisable when both performance targets and time vesting requirements have been met. PBSO were granted on August 15, 2007, February 19, 2008, August 15, 2012 and March 13, 2014 under the 2007 plan. All performance targets for the 2007 and 2008 grants have been met. The time vesting requirements were fulfilled evenly over a five-year period ending on August 15, 2012 with the options being exercisable until August 15, 2015. Time vesting requirements for the 2012 grant will be fulfilled evenly over a five-year term, ending August 15, 2017. The 2012 grant’s performance targets are based on the Company’s share price and must be met by February 15, 2019 or the options expire. Currently, two of the three performance targets have been met as at December 31, 2014 and the options are exercisable until August 15, 2020. Time vesting requirements for the 2014 grant will be fulfilled evenly over a four-year term, ending March 13, 2018. The 2014 grant’s performance targets are based on the Company’s share price and must be met by February 15, 2019 or the options expire. Currently, one of the two performance targets have been met as at December 31, 2014 and the options are exercisable until August 15, 2020.

December 31, 2014	Number	Weighted Average Exercise Price	Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
(options in thousands; intrinsic value in millions of Canadian dollars)
Options outstanding at beginning of year	4,373	35.56
Options granted	138	48.81
Options exercised1	-	-
Options outstanding at end of year	4,511	35.97	4.5	71
Options vested at end of year2	1,964	30.93	3.4	41

No PBSO were exercised in 2014. The total intrinsic value of PBSO exercised during the year ended December 31, 2013 and 2012 was $62 million and $20 million, respectively, and cash received on exercise was $28 million and $12 million.

The total fair value of options vested under the PBSO Plan during the year ended December 31, 2014 was $5 million (2013 - nil; 2012 - $1 million).

Assumptions used to determine the fair value of PBSO granted using the Bloomberg barrier option valuation model are as follows:

Year ended December 31,	2014	2012
Fair value per option (Canadian dollars)	5.77	4.25
Valuation assumptions
Expected option term (years)1	6.5	8
Expected volatility2	15.0%	16.1%
Expected dividend yield3	2.8%	2.8%
Risk-free interest rate4	1.7%	1.6%

The expected option term is based on historical exercise practice.

Expected volatility is determined with reference to historic daily share price volatility.

The expected dividend yield is the current annual dividend at the grant date divided by the current stock price.

The risk-free interest rate is based on the Government of Canada’s Canadian Bond Yields.

Compensation expense recorded for the year ended December 31, 2014 for PBSO was $3 million (2013 - $3 million; 2012 - $2 million). At December 31, 2014, unrecognized compensation cost related to non-vested stock-based compensation arrangements granted under the PBSO Plan was $9 million. The cost is expected to be fully recognized over a weighted average period of approximately three years.

PERFORMANCE STOCK UNITS

The Company has a PSU Plan for executives where 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 the Company’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 the Company’s performance fails to meet threshold performance levels, to a maximum of two if the Company performs within the highest range of its performance targets. The 2012, 2013 and 2014 grants derive the performance multiplier through a calculation of the Company’s price/earnings ratio relative to a specified peer group of companies and the Company’s earnings per share, adjusted for unusual, non-operating or non-recurring items, relative to targets established at the time of grant. To calculate the 2014 expense, multipliers of two, based upon multiplier estimates at December 31, 2014, were used for each of the 2012, 2013 and 2014 PSU grants.

December 31, 2014	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	591
Units granted	274
Units cancelled	(2)
Units matured1	(332)
Dividend reinvestment	24
Units outstanding at end of year	555	1.5	66

The total amount paid during the year ended December 31, 2014 for PSU was $36 million (2013 - $48 million; 2012 - $25 million).

Compensation expense recorded for the year ended December 31, 2014 for PSU was $40 million (2013 - $25 million; 2012 - $49 million). As at December 31, 2014, unrecognized compensation expense related to non-vested units granted under the PSU Plan was $34 million and is expected to be fully recognized over a weighted average period of approximately two years.

RESTRICTED STOCK UNITS

Enbridge has a RSU Plan where cash awards are paid to certain non-executive employees of the Company following a 35-month maturity period. RSU holders receive cash equal to the Company’s 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, 2014	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	1,828
Units granted	1,019
Units cancelled	(99	)
Units matured1	(867	)
Dividend reinvestment	78
Units outstanding at end of year	1,959		1.5	116

The total amount paid during the year ended December 31, 2014 for RSU was $45 million (2013 - $41 million; 2012 - $37 million).

Compensation expense recorded for the year ended December 31, 2014 for RSU was $44 million (2013 - $36 million; 2012 - $32 million). As at December 31, 2014, unrecognized compensation expense related to non-vested units granted under the RSU Plan was $58 million and is expected to be fully recognized over a weighted average period of approximately two years.