Stock-Based Compensation

12 Months Ended

Dec. 31, 2014

Stock-Based Compensation [Line Items]

Stock-Based Compensation

10. Stock-Based Compensation

(All Registrants except LG&E and KU)

In 2012, shareowners approved the PPL SIP. This new equity plan replaces the PPL ICP and incorporates the following changes:

Eliminates the potential to pay dividend equivalents on stock options.

Eliminates the automatic lapse of restrictions on all equity awards in the event of a "potential" change in control and requires that a termination of employment occur in the event of a change in control before restrictions lapse.

Changes the treatment of outstanding stock options upon retirement to limit the exercise period to the earlier of the end of the term (ten years from grant) or five years after retirement.

To further align the executives’ interests with those of PPL shareowners, this plan provides that each restricted stock unit entitles the executive to accrue additional restricted stock units equal to the amount of quarterly dividends paid on PPL stock. These additional restricted stock units would be deferred and payable in shares of PPL common stock at the end of the restriction period. Dividend equivalents on restricted stock unit awards granted under the ICP and ICPKE are currently paid in cash when dividends are declared by PPL.

Under the ICP, SIP and the ICPKE (together, the Plans), restricted shares of PPL common stock, restricted stock units, performance units and stock options may be granted to officers and other key employees of PPL, PPL Energy Supply, PPL Electric, LKE and other affiliated companies. Awards under the Plans are made by the Compensation, Governance and Nominating Committee (CGNC) of the PPL Board of Directors, in the case of the ICP and SIP, and by the PPL Corporate Leadership Council (CLC), in the case of the ICPKE.

The following table details the award limits under each of the plans.

		Annual Grant Limit		Annual Grant Limit
		Total As % of		For Individual Participants -
	Total Plan	Outstanding	Annual Grant	Performance Based Awards
	Award	PPL Common Stock	Limit	For awards	For awards
	Limit	On First Day of	Options	denominated in	denominated in
Plan	(Shares)	Each Calendar Year	(Shares)	shares (Shares)	cash (in dollars)
ICP (a)	15,769,431	2%	3,000,000
SIP	10,000,000		2,000,000	750,000	$	15,000,000
ICPKE	14,199,796	2%	3,000,000

(a)Applicable to outstanding awards granted from January 27, 2006 to January 26, 2012. During 2012, the total plan award limit was reached and the ICP was replaced by the SIP.

Any portion of these awards that has not been granted may be carried over and used in any subsequent year. If any award lapses, is forfeited or the rights of the participant terminate, the shares of PPLcommon stock underlying such an award are again available for grant. Shares delivered under the Plans may be in the form of authorized and unissued PPLcommon stock, common stock held in treasury by PPL or PPLcommon stock purchased on the open market (including private purchases) in accordance with applicable securities laws.

Restricted Stock and Restricted Stock Units

Restricted shares of PPL common stock are outstanding shares with full voting and dividend rights. Restricted stock awards are granted as a retention award for select key executives and vest when the recipient reaches a certain age or meets service or other criteria set forth in the executive's restricted stock award agreement. The shares are subject to forfeiture or accelerated payout under plan provisions for termination, retirement, disability and death of employees. Restricted shares vest fully, in certain situations, as defined by each of the Plans.

The Plans allow for the grant of restricted stock units. Restricted stock units are awards based on the fair value of PPL common stock on the date of grant. Actual PPL common shares will be issued upon completion of a vesting period, generally three years.

The fair value of restricted stock and restricted stock units granted is recognized on a straight-line basis over the service period or through the date at which the employee reaches retirement eligibility. The fair value of restricted stock and restricted stock units granted to retirement-eligible employees is recognized as compensation expense immediately upon the date of grant. Recipients of restricted stock units may also be granted the right to receive dividend equivalents through the end of the restriction period or until the award is forfeited. Restricted stock and restricted stock units are subject to forfeiture or accelerated payout under the plan provisions for termination, retirement, disability and death of employees. Restricted stock and restricted stock units vest fully, in certain situations, as defined by each of the Plans.

The weighted-average grant date fair value of restricted stock and restricted stock units granted was:

	2014		2013		2012
PPL	$	31.50	$	30.30	$	28.35
PPL Energy Supply		31.70		30.42		28.29
PPL Electric		31.81		30.55		28.51
LKE		30.98		30.00		28.34

Restricted stock and restricted stock unit activity for 2014 was:

			Weighted-
			Average
		Restricted	Grant Date Fair
		Shares/Units	Value Per Share
PPL
Nonvested, beginning of period		3,140,600	$	28.50
	Granted	1,197,947		31.50
	Vested	(804,582)		26.01
	Forfeited	(48,445)		30.48
Nonvested, end of period		3,485,520		30.07
PPL Energy Supply
Nonvested, beginning of period		1,343,404	$	28.71
	Transferred	70,298		27.43
	Granted	465,238		31.70
	Vested	(395,740)		26.19
	Forfeited	(25,300)		30.54
Nonvested, end of period		1,457,900		30.13
PPL Electric
Nonvested, beginning of period		265,550	$	28.22
	Transferred	2,270		29.03
	Granted	103,511		31.81
	Vested	(78,370)		26.04
	Forfeited	(6,150)		30.65
Nonvested, end of period		286,811		30.04
LKE
Nonvested, beginning of period		231,553	$	29.17
	Granted	112,625		30.98
	Vested	(2,710)		29.97
Nonvested, end of period		341,468		29.76

Substantially all restricted stock and restricted stock unit awards are expected to vest.

The total fair value of restricted stock and restricted stock units vesting for the years ended December 31 was:

	2014		2013		2012
PPL	$	21	$	19	$	27
PPL Energy Supply		10		7		6
PPL Electric		2		3		2
LKE				1		4

Performance Units

Performance units are intended to encourage and reward future corporate performance. Performance units represent a target number of shares (Target Award) of PPL's common stock that the recipient would receive upon PPL's attainment of the applicable performance goal. Performance is determined based on total shareowner return during a three-year performance period. At the end of the period, payout is determined by comparing PPL's performance to the total shareowner return of the companies included in the Philadelphia Stock Exchange Utility Index. Awards are payable on a graduated basis based on thresholds that measure PPL's performance relative to peers that comprise the applicable index on which each years' awards are measured. Awards can be paid up to 200% of the Target Award or forfeited with no payout if performance is below a minimum established performance threshold. Dividends payable during the performance cycle accumulate and are converted into additional performance units and are payable in shares of PPL common stock upon completion of the performance period based on the determination of the CGNC of whether the performance goals have been achieved. Under the plan provisions, performance units are subject to forfeiture upon termination of employment except for retirement, disability or death of an employee, in which case the total performance units remain outstanding and are eligible for vesting through the conclusion of the performance period.

Beginning in 2014, the fair value of performance units grantedto retirement-eligible employees is recognized as compensation expense on a straight-line basis over a one-year period, the minimum vesting period required for an employee to be entitled to payout of the awards. For employees who are not retirement-eligible, compensation expense is recognized over the shorter of the three-year performance period or the period until the employee is retirement-eligible, with a minimum vesting and recognition period of one-year. The fair value of performance units granted in 2013 and 2012 is recognized as compensation expense on a straight-line basis over the three-year performance period. Performance units vest on a pro rata basis, in certain situations, as defined by each of the Plans.

The fair value of each performance unit granted was estimated using a Monte Carlo pricing model that considers stock beta, a risk-free interest rate, expected stock volatility and expected life. The stock beta was calculated comparing the risk of the individual securities to the average risk of the companies in the index group. The risk-free interest rate reflects the yield on a U.S. Treasury bond commensurate with the expected life of the performance unit. Volatility over the expected term of the performance unit is calculated using daily stock price observations for PPL and all companies in the index group and is evaluated with consideration given to prior periods that may need to be excluded based on events not likely to recur that had impacted PPL and the companies in the index group. PPLuses a mix of historic and implied volatility to value awards.

The weighted-average assumptions used in the model were:

	2014	2013	2012
Risk-free interest rate	0.75%	0.36%	0.30%
Expected stock volatility	15.80%	15.50%	19.30%
Expected life	3 years	3 years	3 years

The weighted-average grant date fair value of performance units granted was:

	2014		2013		2012
PPL	$	34.55	$	34.15	$	31.41
PPL Energy Supply		34.35		34.29		31.40
PPL Electric		34.43		33.97		31.37
LKE		34.12		33.84		31.30

Performance unit activity for 2014 was:

				Weighted-
				Average Grant
		Performance		Date Fair Value
		Units		Per Share
PPL
Nonvested, beginning of period			793,199	$	32.19
	Granted		555,553		34.55
	Vested		(177,036)		29.11
Nonvested, end of period			1,171,716		33.77
PPL Energy Supply
Nonvested, beginning of period			170,609	$	32.22
	Transferred		27,656		32.12
	Granted		138,601		34.35
	Vested		(45,374)		29.11
Nonvested, end of period			291,492		33.71
PPL Electric
Nonvested, beginning of period			38,210	$	32.22
	Granted		29,701		34.43
	Vested		(8,296)		28.99
Nonvested, end of period			59,615		33.77
LKE
Nonvested, beginning of period			129,630	$	31.88
	Granted		75,174		34.12
	Vested		(30,858)		29.20
Nonvested, end of period			173,946		33.32

The total fair value of performance units vesting for the year ended December 31, 2014 was $5 million for PPL and insignificant for PPL Energy Supply, PPL Electric and LKE.

Stock Options

PPL’s CGNC eliminated the use of stock options and changed its long-term incentive mix to 60% performance units and 40% performance-contingent restricted stock units, resulting in 100% performance-based long-term incentive mix for equity awards granted beginning in January 2014.

Under the Plans, stock options had been granted with an option exercise price per share not less than the fair value of PPL's common stock on the date of grant. Options outstanding at December 31, 2014, become exercisable in equal installments over a three-year service period beginning one year after the date of grant, assuming the individual is still employed by PPL or a subsidiary. The CGNC and CLC have discretion to accelerate the exercisability of the options, except that the exercisability of an option issued under the ICP may not be accelerated unless the individual remains employed by PPL or a subsidiary for one year from the date of grant. All options expire no later than ten years from the grant date. The options become exercisable immediately in certain situations, as defined by each of the Plans. The fair value of options granted is recognized as compensation expense on a straight-line basis over the service period or through the date at which the employee reaches retirement eligibility. The fair value of options granted to retirement-eligible employees is recognized as compensation expense immediately upon the date of grant.

The fair value of each option granted is estimated using a Black-Scholes option-pricing model. PPL uses a risk-free interest rate, expected option life, expected volatility and dividend yield to value its stock options. The risk-free interest rate reflects the yield for a U.S. Treasury Strip available on the date of grant with constant rate maturity approximating the option's expected life. Expected life is calculated based on historical exercise behavior. Volatility over the expected term of the options is evaluated with consideration given to prior periods that may need to be excluded based on events not likely to recur that had impacted PPL's volatility in those prior periods. Management's expectations for future volatility, considering potential changes to PPL's business model and other economic conditions, are also reviewed in addition to the historical data to determine the final volatility assumption. PPL uses a mix of historic and implied volatility to value awards.The dividend yield is based on several factors, including PPL's most recent dividend payment, as of the grant date and the forecasted stock price.The assumptions used in the model were:

	2013		2012
Risk-free interest rate		1.15%		1.13%
Expected option life		6.48 years		6.17 years
Expected stock volatility		18.50%		20.60%
Dividend yield		5.00%		5.00%

The weighted-average grant date fair value of options granted was:

	2013		2012
PPL	$	2.18	$	2.48
PPL Energy Supply		2.19		2.51
PPL Electric		2.19		2.50
LKE		2.18		2.51

Stock option activity for 2014 was:

						Weighted-
				Weighted		Average
				Average		Remaining		Aggregate
		Number		Exercise		Contractual		Total Intrinsic
		of Options		Price Per Share		Term (years)		Value
PPL
Outstanding at beginning of period			11,381,482	$	30.45
	Exercised		(2,338,520)		28.58
Outstanding at end of period			9,042,962		30.93		5.9	$	56
Options exercisable at end of period			6,432,806		31.60		5.2		38
PPL Energy Supply
Outstanding at beginning of period			2,845,336	$	30.47
	Transferred		458,800		30.47
	Exercised		(559,120)		28.79
Outstanding at end of period			2,745,016		30.84		5.6	$	17
Options exercisable at end of period			2,166,150		31.24		5.0		13
PPL Electric
Outstanding at beginning of period			532,200	$	30.04
	Exercised		(24,280)		30.12
Outstanding at end of period			507,920		30.04		6.3	$	3
Options exercisable at end of period			386,413		30.27		5.8		3
LKE
Outstanding at beginning of period			997,156	$	28.35
	Exercised		(373,839)		27.87
Outstanding at end of period			623,317		28.64		7.5	$	5
Options exercisable at end of period			215,106		27.58		6.9		2

Substantially all stock option awards are expected to vest.

PPL received $67 million in cash from stock options exercised in 2014. The related income tax benefits realized were not significant.

The total intrinsic value of stock options exercised for 2014 was $13 million, 2013 was $6 million and was not significant for 2012.

Compensation Expense

Compensation expense for restricted stock, restricted stock units, performance units and stock options accounted for as equity awards, which for PPL Energy Supply, PPL Electric and LKE includes an allocation of PPL Services' expense, was:

	2014		2013		2012
PPL	$	63	$	52	$	49
PPL Energy Supply		33		27		23
PPL Electric		12		10		11
LKE		8		8		8

The income tax benefit related to above compensation expense was as follows:

	2014		2013		2012
PPL	$	26	$	22	$	20
PPL Energy Supply		14		11		10
PPL Electric		5		4		4
LKE		3		3		4

The income tax benefit PPL realized from stock-based awards vested or exercised for 2014 was $4 million and was not significant for 2013 and 2012.

At December 31, 2014, unrecognized compensation expense related to nonvestedrestricted stock, restricted stock units, performance units and stock option awards was:

			Weighted-
	Unrecognized		Average
	Compensation		Period for
	Expense		Recognition
PPL	$	27		1.7 years
PPL Energy Supply		13		1.8 years
PPL Electric		3		1.8 years
LKE		2		1.3 years

PPL Energy Supply LLC [Member]

Stock-Based Compensation [Line Items]

Stock-Based Compensation

10. Stock-Based Compensation

(All Registrants except LG&E and KU)

In 2012, shareowners approved the PPL SIP. This new equity plan replaces the PPL ICP and incorporates the following changes:

Eliminates the potential to pay dividend equivalents on stock options.

Eliminates the automatic lapse of restrictions on all equity awards in the event of a "potential" change in control and requires that a termination of employment occur in the event of a change in control before restrictions lapse.

Changes the treatment of outstanding stock options upon retirement to limit the exercise period to the earlier of the end of the term (ten years from grant) or five years after retirement.

To further align the executives’ interests with those of PPL shareowners, this plan provides that each restricted stock unit entitles the executive to accrue additional restricted stock units equal to the amount of quarterly dividends paid on PPL stock. These additional restricted stock units would be deferred and payable in shares of PPL common stock at the end of the restriction period. Dividend equivalents on restricted stock unit awards granted under the ICP and ICPKE are currently paid in cash when dividends are declared by PPL.

Under the ICP, SIP and the ICPKE (together, the Plans), restricted shares of PPL common stock, restricted stock units, performance units and stock options may be granted to officers and other key employees of PPL, PPL Energy Supply, PPL Electric, LKE and other affiliated companies. Awards under the Plans are made by the Compensation, Governance and Nominating Committee (CGNC) of the PPL Board of Directors, in the case of the ICP and SIP, and by the PPL Corporate Leadership Council (CLC), in the case of the ICPKE.

The following table details the award limits under each of the plans.

		Annual Grant Limit		Annual Grant Limit
		Total As % of		For Individual Participants -
	Total Plan	Outstanding	Annual Grant	Performance Based Awards
	Award	PPL Common Stock	Limit	For awards	For awards
	Limit	On First Day of	Options	denominated in	denominated in
Plan	(Shares)	Each Calendar Year	(Shares)	shares (Shares)	cash (in dollars)
ICP (a)	15,769,431	2%	3,000,000
SIP	10,000,000		2,000,000	750,000	$	15,000,000
ICPKE	14,199,796	2%	3,000,000

(a)Applicable to outstanding awards granted from January 27, 2006 to January 26, 2012. During 2012, the total plan award limit was reached and the ICP was replaced by the SIP.

Any portion of these awards that has not been granted may be carried over and used in any subsequent year. If any award lapses, is forfeited or the rights of the participant terminate, the shares of PPLcommon stock underlying such an award are again available for grant. Shares delivered under the Plans may be in the form of authorized and unissued PPLcommon stock, common stock held in treasury by PPL or PPLcommon stock purchased on the open market (including private purchases) in accordance with applicable securities laws.

Restricted Stock and Restricted Stock Units

Restricted shares of PPL common stock are outstanding shares with full voting and dividend rights. Restricted stock awards are granted as a retention award for select key executives and vest when the recipient reaches a certain age or meets service or other criteria set forth in the executive's restricted stock award agreement. The shares are subject to forfeiture or accelerated payout under plan provisions for termination, retirement, disability and death of employees. Restricted shares vest fully, in certain situations, as defined by each of the Plans.

The Plans allow for the grant of restricted stock units. Restricted stock units are awards based on the fair value of PPL common stock on the date of grant. Actual PPL common shares will be issued upon completion of a vesting period, generally three years.

The fair value of restricted stock and restricted stock units granted is recognized on a straight-line basis over the service period or through the date at which the employee reaches retirement eligibility. The fair value of restricted stock and restricted stock units granted to retirement-eligible employees is recognized as compensation expense immediately upon the date of grant. Recipients of restricted stock units may also be granted the right to receive dividend equivalents through the end of the restriction period or until the award is forfeited. Restricted stock and restricted stock units are subject to forfeiture or accelerated payout under the plan provisions for termination, retirement, disability and death of employees. Restricted stock and restricted stock units vest fully, in certain situations, as defined by each of the Plans.

The weighted-average grant date fair value of restricted stock and restricted stock units granted was:

	2014		2013		2012
PPL	$	31.50	$	30.30	$	28.35
PPL Energy Supply		31.70		30.42		28.29
PPL Electric		31.81		30.55		28.51
LKE		30.98		30.00		28.34

Restricted stock and restricted stock unit activity for 2014 was:

			Weighted-
			Average
		Restricted	Grant Date Fair
		Shares/Units	Value Per Share
PPL
Nonvested, beginning of period		3,140,600	$	28.50
	Granted	1,197,947		31.50
	Vested	(804,582)		26.01
	Forfeited	(48,445)		30.48
Nonvested, end of period		3,485,520		30.07
PPL Energy Supply
Nonvested, beginning of period		1,343,404	$	28.71
	Transferred	70,298		27.43
	Granted	465,238		31.70
	Vested	(395,740)		26.19
	Forfeited	(25,300)		30.54
Nonvested, end of period		1,457,900		30.13
PPL Electric
Nonvested, beginning of period		265,550	$	28.22
	Transferred	2,270		29.03
	Granted	103,511		31.81
	Vested	(78,370)		26.04
	Forfeited	(6,150)		30.65
Nonvested, end of period		286,811		30.04
LKE
Nonvested, beginning of period		231,553	$	29.17
	Granted	112,625		30.98
	Vested	(2,710)		29.97
Nonvested, end of period		341,468		29.76

Substantially all restricted stock and restricted stock unit awards are expected to vest.

The total fair value of restricted stock and restricted stock units vesting for the years ended December 31 was:

	2014		2013		2012
PPL	$	21	$	19	$	27
PPL Energy Supply		10		7		6
PPL Electric		2		3		2
LKE				1		4

Performance Units

Performance units are intended to encourage and reward future corporate performance. Performance units represent a target number of shares (Target Award) of PPL's common stock that the recipient would receive upon PPL's attainment of the applicable performance goal. Performance is determined based on total shareowner return during a three-year performance period. At the end of the period, payout is determined by comparing PPL's performance to the total shareowner return of the companies included in the Philadelphia Stock Exchange Utility Index. Awards are payable on a graduated basis based on thresholds that measure PPL's performance relative to peers that comprise the applicable index on which each years' awards are measured. Awards can be paid up to 200% of the Target Award or forfeited with no payout if performance is below a minimum established performance threshold. Dividends payable during the performance cycle accumulate and are converted into additional performance units and are payable in shares of PPL common stock upon completion of the performance period based on the determination of the CGNC of whether the performance goals have been achieved. Under the plan provisions, performance units are subject to forfeiture upon termination of employment except for retirement, disability or death of an employee, in which case the total performance units remain outstanding and are eligible for vesting through the conclusion of the performance period.

Beginning in 2014, the fair value of performance units grantedto retirement-eligible employees is recognized as compensation expense on a straight-line basis over a one-year period, the minimum vesting period required for an employee to be entitled to payout of the awards. For employees who are not retirement-eligible, compensation expense is recognized over the shorter of the three-year performance period or the period until the employee is retirement-eligible, with a minimum vesting and recognition period of one-year. The fair value of performance units granted in 2013 and 2012 is recognized as compensation expense on a straight-line basis over the three-year performance period. Performance units vest on a pro rata basis, in certain situations, as defined by each of the Plans.

The fair value of each performance unit granted was estimated using a Monte Carlo pricing model that considers stock beta, a risk-free interest rate, expected stock volatility and expected life. The stock beta was calculated comparing the risk of the individual securities to the average risk of the companies in the index group. The risk-free interest rate reflects the yield on a U.S. Treasury bond commensurate with the expected life of the performance unit. Volatility over the expected term of the performance unit is calculated using daily stock price observations for PPL and all companies in the index group and is evaluated with consideration given to prior periods that may need to be excluded based on events not likely to recur that had impacted PPL and the companies in the index group. PPLuses a mix of historic and implied volatility to value awards.

The weighted-average assumptions used in the model were:

	2014	2013	2012
Risk-free interest rate	0.75%	0.36%	0.30%
Expected stock volatility	15.80%	15.50%	19.30%
Expected life	3 years	3 years	3 years

The weighted-average grant date fair value of performance units granted was:

	2014		2013		2012
PPL	$	34.55	$	34.15	$	31.41
PPL Energy Supply		34.35		34.29		31.40
PPL Electric		34.43		33.97		31.37
LKE		34.12		33.84		31.30

Performance unit activity for 2014 was:

				Weighted-
				Average Grant
		Performance		Date Fair Value
		Units		Per Share
PPL
Nonvested, beginning of period			793,199	$	32.19
	Granted		555,553		34.55
	Vested		(177,036)		29.11
Nonvested, end of period			1,171,716		33.77
PPL Energy Supply
Nonvested, beginning of period			170,609	$	32.22
	Transferred		27,656		32.12
	Granted		138,601		34.35
	Vested		(45,374)		29.11
Nonvested, end of period			291,492		33.71
PPL Electric
Nonvested, beginning of period			38,210	$	32.22
	Granted		29,701		34.43
	Vested		(8,296)		28.99
Nonvested, end of period			59,615		33.77
LKE
Nonvested, beginning of period			129,630	$	31.88
	Granted		75,174		34.12
	Vested		(30,858)		29.20
Nonvested, end of period			173,946		33.32

The total fair value of performance units vesting for the year ended December 31, 2014 was $5 million for PPL and insignificant for PPL Energy Supply, PPL Electric and LKE.

Stock Options

PPL’s CGNC eliminated the use of stock options and changed its long-term incentive mix to 60% performance units and 40% performance-contingent restricted stock units, resulting in 100% performance-based long-term incentive mix for equity awards granted beginning in January 2014.

Under the Plans, stock options had been granted with an option exercise price per share not less than the fair value of PPL's common stock on the date of grant. Options outstanding at December 31, 2014, become exercisable in equal installments over a three-year service period beginning one year after the date of grant, assuming the individual is still employed by PPL or a subsidiary. The CGNC and CLC have discretion to accelerate the exercisability of the options, except that the exercisability of an option issued under the ICP may not be accelerated unless the individual remains employed by PPL or a subsidiary for one year from the date of grant. All options expire no later than ten years from the grant date. The options become exercisable immediately in certain situations, as defined by each of the Plans. The fair value of options granted is recognized as compensation expense on a straight-line basis over the service period or through the date at which the employee reaches retirement eligibility. The fair value of options granted to retirement-eligible employees is recognized as compensation expense immediately upon the date of grant.

The fair value of each option granted is estimated using a Black-Scholes option-pricing model. PPL uses a risk-free interest rate, expected option life, expected volatility and dividend yield to value its stock options. The risk-free interest rate reflects the yield for a U.S. Treasury Strip available on the date of grant with constant rate maturity approximating the option's expected life. Expected life is calculated based on historical exercise behavior. Volatility over the expected term of the options is evaluated with consideration given to prior periods that may need to be excluded based on events not likely to recur that had impacted PPL's volatility in those prior periods. Management's expectations for future volatility, considering potential changes to PPL's business model and other economic conditions, are also reviewed in addition to the historical data to determine the final volatility assumption. PPL uses a mix of historic and implied volatility to value awards.The dividend yield is based on several factors, including PPL's most recent dividend payment, as of the grant date and the forecasted stock price.The assumptions used in the model were:

	2013		2012
Risk-free interest rate		1.15%		1.13%
Expected option life		6.48 years		6.17 years
Expected stock volatility		18.50%		20.60%
Dividend yield		5.00%		5.00%

The weighted-average grant date fair value of options granted was:

	2013		2012
PPL	$	2.18	$	2.48
PPL Energy Supply		2.19		2.51
PPL Electric		2.19		2.50
LKE		2.18		2.51

Stock option activity for 2014 was:

						Weighted-
				Weighted		Average
				Average		Remaining		Aggregate
		Number		Exercise		Contractual		Total Intrinsic
		of Options		Price Per Share		Term (years)		Value
PPL
Outstanding at beginning of period			11,381,482	$	30.45
	Exercised		(2,338,520)		28.58
Outstanding at end of period			9,042,962		30.93		5.9	$	56
Options exercisable at end of period			6,432,806		31.60		5.2		38
PPL Energy Supply
Outstanding at beginning of period			2,845,336	$	30.47
	Transferred		458,800		30.47
	Exercised		(559,120)		28.79
Outstanding at end of period			2,745,016		30.84		5.6	$	17
Options exercisable at end of period			2,166,150		31.24		5.0		13
PPL Electric
Outstanding at beginning of period			532,200	$	30.04
	Exercised		(24,280)		30.12
Outstanding at end of period			507,920		30.04		6.3	$	3
Options exercisable at end of period			386,413		30.27		5.8		3
LKE
Outstanding at beginning of period			997,156	$	28.35
	Exercised		(373,839)		27.87
Outstanding at end of period			623,317		28.64		7.5	$	5
Options exercisable at end of period			215,106		27.58		6.9		2

Substantially all stock option awards are expected to vest.

PPL received $67 million in cash from stock options exercised in 2014. The related income tax benefits realized were not significant.

The total intrinsic value of stock options exercised for 2014 was $13 million, 2013 was $6 million and was not significant for 2012.

Compensation Expense

Compensation expense for restricted stock, restricted stock units, performance units and stock options accounted for as equity awards, which for PPL Energy Supply, PPL Electric and LKE includes an allocation of PPL Services' expense, was:

	2014		2013		2012
PPL	$	63	$	52	$	49
PPL Energy Supply		33		27		23
PPL Electric		12		10		11
LKE		8		8		8

The income tax benefit related to above compensation expense was as follows:

	2014		2013		2012
PPL	$	26	$	22	$	20
PPL Energy Supply		14		11		10
PPL Electric		5		4		4
LKE		3		3		4

The income tax benefit PPL realized from stock-based awards vested or exercised for 2014 was $4 million and was not significant for 2013 and 2012.

At December 31, 2014, unrecognized compensation expense related to nonvestedrestricted stock, restricted stock units, performance units and stock option awards was:

			Weighted-
	Unrecognized		Average
	Compensation		Period for
	Expense		Recognition
PPL	$	27		1.7 years
PPL Energy Supply		13		1.8 years
PPL Electric		3		1.8 years
LKE		2		1.3 years

PPL Electric Utilities Corp [Member]

Stock-Based Compensation [Line Items]

Stock-Based Compensation

10. Stock-Based Compensation

(All Registrants except LG&E and KU)

In 2012, shareowners approved the PPL SIP. This new equity plan replaces the PPL ICP and incorporates the following changes:

Eliminates the potential to pay dividend equivalents on stock options.

Eliminates the automatic lapse of restrictions on all equity awards in the event of a "potential" change in control and requires that a termination of employment occur in the event of a change in control before restrictions lapse.

Changes the treatment of outstanding stock options upon retirement to limit the exercise period to the earlier of the end of the term (ten years from grant) or five years after retirement.

To further align the executives’ interests with those of PPL shareowners, this plan provides that each restricted stock unit entitles the executive to accrue additional restricted stock units equal to the amount of quarterly dividends paid on PPL stock. These additional restricted stock units would be deferred and payable in shares of PPL common stock at the end of the restriction period. Dividend equivalents on restricted stock unit awards granted under the ICP and ICPKE are currently paid in cash when dividends are declared by PPL.

Under the ICP, SIP and the ICPKE (together, the Plans), restricted shares of PPL common stock, restricted stock units, performance units and stock options may be granted to officers and other key employees of PPL, PPL Energy Supply, PPL Electric, LKE and other affiliated companies. Awards under the Plans are made by the Compensation, Governance and Nominating Committee (CGNC) of the PPL Board of Directors, in the case of the ICP and SIP, and by the PPL Corporate Leadership Council (CLC), in the case of the ICPKE.

The following table details the award limits under each of the plans.

		Annual Grant Limit		Annual Grant Limit
		Total As % of		For Individual Participants -
	Total Plan	Outstanding	Annual Grant	Performance Based Awards
	Award	PPL Common Stock	Limit	For awards	For awards
	Limit	On First Day of	Options	denominated in	denominated in
Plan	(Shares)	Each Calendar Year	(Shares)	shares (Shares)	cash (in dollars)
ICP (a)	15,769,431	2%	3,000,000
SIP	10,000,000		2,000,000	750,000	$	15,000,000
ICPKE	14,199,796	2%	3,000,000

(a)Applicable to outstanding awards granted from January 27, 2006 to January 26, 2012. During 2012, the total plan award limit was reached and the ICP was replaced by the SIP.

Any portion of these awards that has not been granted may be carried over and used in any subsequent year. If any award lapses, is forfeited or the rights of the participant terminate, the shares of PPLcommon stock underlying such an award are again available for grant. Shares delivered under the Plans may be in the form of authorized and unissued PPLcommon stock, common stock held in treasury by PPL or PPLcommon stock purchased on the open market (including private purchases) in accordance with applicable securities laws.

Restricted Stock and Restricted Stock Units

Restricted shares of PPL common stock are outstanding shares with full voting and dividend rights. Restricted stock awards are granted as a retention award for select key executives and vest when the recipient reaches a certain age or meets service or other criteria set forth in the executive's restricted stock award agreement. The shares are subject to forfeiture or accelerated payout under plan provisions for termination, retirement, disability and death of employees. Restricted shares vest fully, in certain situations, as defined by each of the Plans.

The Plans allow for the grant of restricted stock units. Restricted stock units are awards based on the fair value of PPL common stock on the date of grant. Actual PPL common shares will be issued upon completion of a vesting period, generally three years.

The fair value of restricted stock and restricted stock units granted is recognized on a straight-line basis over the service period or through the date at which the employee reaches retirement eligibility. The fair value of restricted stock and restricted stock units granted to retirement-eligible employees is recognized as compensation expense immediately upon the date of grant. Recipients of restricted stock units may also be granted the right to receive dividend equivalents through the end of the restriction period or until the award is forfeited. Restricted stock and restricted stock units are subject to forfeiture or accelerated payout under the plan provisions for termination, retirement, disability and death of employees. Restricted stock and restricted stock units vest fully, in certain situations, as defined by each of the Plans.

The weighted-average grant date fair value of restricted stock and restricted stock units granted was:

	2014		2013		2012
PPL	$	31.50	$	30.30	$	28.35
PPL Energy Supply		31.70		30.42		28.29
PPL Electric		31.81		30.55		28.51
LKE		30.98		30.00		28.34

Restricted stock and restricted stock unit activity for 2014 was:

			Weighted-
			Average
		Restricted	Grant Date Fair
		Shares/Units	Value Per Share
PPL
Nonvested, beginning of period		3,140,600	$	28.50
	Granted	1,197,947		31.50
	Vested	(804,582)		26.01
	Forfeited	(48,445)		30.48
Nonvested, end of period		3,485,520		30.07
PPL Energy Supply
Nonvested, beginning of period		1,343,404	$	28.71
	Transferred	70,298		27.43
	Granted	465,238		31.70
	Vested	(395,740)		26.19
	Forfeited	(25,300)		30.54
Nonvested, end of period		1,457,900		30.13
PPL Electric
Nonvested, beginning of period		265,550	$	28.22
	Transferred	2,270		29.03
	Granted	103,511		31.81
	Vested	(78,370)		26.04
	Forfeited	(6,150)		30.65
Nonvested, end of period		286,811		30.04
LKE
Nonvested, beginning of period		231,553	$	29.17
	Granted	112,625		30.98
	Vested	(2,710)		29.97
Nonvested, end of period		341,468		29.76

Substantially all restricted stock and restricted stock unit awards are expected to vest.

The total fair value of restricted stock and restricted stock units vesting for the years ended December 31 was:

	2014		2013		2012
PPL	$	21	$	19	$	27
PPL Energy Supply		10		7		6
PPL Electric		2		3		2
LKE				1		4

Performance Units

Performance units are intended to encourage and reward future corporate performance. Performance units represent a target number of shares (Target Award) of PPL's common stock that the recipient would receive upon PPL's attainment of the applicable performance goal. Performance is determined based on total shareowner return during a three-year performance period. At the end of the period, payout is determined by comparing PPL's performance to the total shareowner return of the companies included in the Philadelphia Stock Exchange Utility Index. Awards are payable on a graduated basis based on thresholds that measure PPL's performance relative to peers that comprise the applicable index on which each years' awards are measured. Awards can be paid up to 200% of the Target Award or forfeited with no payout if performance is below a minimum established performance threshold. Dividends payable during the performance cycle accumulate and are converted into additional performance units and are payable in shares of PPL common stock upon completion of the performance period based on the determination of the CGNC of whether the performance goals have been achieved. Under the plan provisions, performance units are subject to forfeiture upon termination of employment except for retirement, disability or death of an employee, in which case the total performance units remain outstanding and are eligible for vesting through the conclusion of the performance period.

Beginning in 2014, the fair value of performance units grantedto retirement-eligible employees is recognized as compensation expense on a straight-line basis over a one-year period, the minimum vesting period required for an employee to be entitled to payout of the awards. For employees who are not retirement-eligible, compensation expense is recognized over the shorter of the three-year performance period or the period until the employee is retirement-eligible, with a minimum vesting and recognition period of one-year. The fair value of performance units granted in 2013 and 2012 is recognized as compensation expense on a straight-line basis over the three-year performance period. Performance units vest on a pro rata basis, in certain situations, as defined by each of the Plans.

The fair value of each performance unit granted was estimated using a Monte Carlo pricing model that considers stock beta, a risk-free interest rate, expected stock volatility and expected life. The stock beta was calculated comparing the risk of the individual securities to the average risk of the companies in the index group. The risk-free interest rate reflects the yield on a U.S. Treasury bond commensurate with the expected life of the performance unit. Volatility over the expected term of the performance unit is calculated using daily stock price observations for PPL and all companies in the index group and is evaluated with consideration given to prior periods that may need to be excluded based on events not likely to recur that had impacted PPL and the companies in the index group. PPLuses a mix of historic and implied volatility to value awards.

The weighted-average assumptions used in the model were:

	2014	2013	2012
Risk-free interest rate	0.75%	0.36%	0.30%
Expected stock volatility	15.80%	15.50%	19.30%
Expected life	3 years	3 years	3 years

The weighted-average grant date fair value of performance units granted was:

	2014		2013		2012
PPL	$	34.55	$	34.15	$	31.41
PPL Energy Supply		34.35		34.29		31.40
PPL Electric		34.43		33.97		31.37
LKE		34.12		33.84		31.30

Performance unit activity for 2014 was:

				Weighted-
				Average Grant
		Performance		Date Fair Value
		Units		Per Share
PPL
Nonvested, beginning of period			793,199	$	32.19
	Granted		555,553		34.55
	Vested		(177,036)		29.11
Nonvested, end of period			1,171,716		33.77
PPL Energy Supply
Nonvested, beginning of period			170,609	$	32.22
	Transferred		27,656		32.12
	Granted		138,601		34.35
	Vested		(45,374)		29.11
Nonvested, end of period			291,492		33.71
PPL Electric
Nonvested, beginning of period			38,210	$	32.22
	Granted		29,701		34.43
	Vested		(8,296)		28.99
Nonvested, end of period			59,615		33.77
LKE
Nonvested, beginning of period			129,630	$	31.88
	Granted		75,174		34.12
	Vested		(30,858)		29.20
Nonvested, end of period			173,946		33.32

The total fair value of performance units vesting for the year ended December 31, 2014 was $5 million for PPL and insignificant for PPL Energy Supply, PPL Electric and LKE.

Stock Options

PPL’s CGNC eliminated the use of stock options and changed its long-term incentive mix to 60% performance units and 40% performance-contingent restricted stock units, resulting in 100% performance-based long-term incentive mix for equity awards granted beginning in January 2014.

Under the Plans, stock options had been granted with an option exercise price per share not less than the fair value of PPL's common stock on the date of grant. Options outstanding at December 31, 2014, become exercisable in equal installments over a three-year service period beginning one year after the date of grant, assuming the individual is still employed by PPL or a subsidiary. The CGNC and CLC have discretion to accelerate the exercisability of the options, except that the exercisability of an option issued under the ICP may not be accelerated unless the individual remains employed by PPL or a subsidiary for one year from the date of grant. All options expire no later than ten years from the grant date. The options become exercisable immediately in certain situations, as defined by each of the Plans. The fair value of options granted is recognized as compensation expense on a straight-line basis over the service period or through the date at which the employee reaches retirement eligibility. The fair value of options granted to retirement-eligible employees is recognized as compensation expense immediately upon the date of grant.

The fair value of each option granted is estimated using a Black-Scholes option-pricing model. PPL uses a risk-free interest rate, expected option life, expected volatility and dividend yield to value its stock options. The risk-free interest rate reflects the yield for a U.S. Treasury Strip available on the date of grant with constant rate maturity approximating the option's expected life. Expected life is calculated based on historical exercise behavior. Volatility over the expected term of the options is evaluated with consideration given to prior periods that may need to be excluded based on events not likely to recur that had impacted PPL's volatility in those prior periods. Management's expectations for future volatility, considering potential changes to PPL's business model and other economic conditions, are also reviewed in addition to the historical data to determine the final volatility assumption. PPL uses a mix of historic and implied volatility to value awards.The dividend yield is based on several factors, including PPL's most recent dividend payment, as of the grant date and the forecasted stock price.The assumptions used in the model were:

	2013		2012
Risk-free interest rate		1.15%		1.13%
Expected option life		6.48 years		6.17 years
Expected stock volatility		18.50%		20.60%
Dividend yield		5.00%		5.00%

The weighted-average grant date fair value of options granted was:

	2013		2012
PPL	$	2.18	$	2.48
PPL Energy Supply		2.19		2.51
PPL Electric		2.19		2.50
LKE		2.18		2.51

Stock option activity for 2014 was:

						Weighted-
				Weighted		Average
				Average		Remaining		Aggregate
		Number		Exercise		Contractual		Total Intrinsic
		of Options		Price Per Share		Term (years)		Value
PPL
Outstanding at beginning of period			11,381,482	$	30.45
	Exercised		(2,338,520)		28.58
Outstanding at end of period			9,042,962		30.93		5.9	$	56
Options exercisable at end of period			6,432,806		31.60		5.2		38
PPL Energy Supply
Outstanding at beginning of period			2,845,336	$	30.47
	Transferred		458,800		30.47
	Exercised		(559,120)		28.79
Outstanding at end of period			2,745,016		30.84		5.6	$	17
Options exercisable at end of period			2,166,150		31.24		5.0		13
PPL Electric
Outstanding at beginning of period			532,200	$	30.04
	Exercised		(24,280)		30.12
Outstanding at end of period			507,920		30.04		6.3	$	3
Options exercisable at end of period			386,413		30.27		5.8		3
LKE
Outstanding at beginning of period			997,156	$	28.35
	Exercised		(373,839)		27.87
Outstanding at end of period			623,317		28.64		7.5	$	5
Options exercisable at end of period			215,106		27.58		6.9		2

Substantially all stock option awards are expected to vest.

PPL received $67 million in cash from stock options exercised in 2014. The related income tax benefits realized were not significant.

The total intrinsic value of stock options exercised for 2014 was $13 million, 2013 was $6 million and was not significant for 2012.

Compensation Expense

Compensation expense for restricted stock, restricted stock units, performance units and stock options accounted for as equity awards, which for PPL Energy Supply, PPL Electric and LKE includes an allocation of PPL Services' expense, was:

	2014		2013		2012
PPL	$	63	$	52	$	49
PPL Energy Supply		33		27		23
PPL Electric		12		10		11
LKE		8		8		8

The income tax benefit related to above compensation expense was as follows:

	2014		2013		2012
PPL	$	26	$	22	$	20
PPL Energy Supply		14		11		10
PPL Electric		5		4		4
LKE		3		3		4

The income tax benefit PPL realized from stock-based awards vested or exercised for 2014 was $4 million and was not significant for 2013 and 2012.

At December 31, 2014, unrecognized compensation expense related to nonvestedrestricted stock, restricted stock units, performance units and stock option awards was:

			Weighted-
	Unrecognized		Average
	Compensation		Period for
	Expense		Recognition
PPL	$	27		1.7 years
PPL Energy Supply		13		1.8 years
PPL Electric		3		1.8 years
LKE		2		1.3 years

LG And E And KU Energy LLC [Member]

Stock-Based Compensation [Line Items]

Stock-Based Compensation

10. Stock-Based Compensation

(All Registrants except LG&E and KU)

In 2012, shareowners approved the PPL SIP. This new equity plan replaces the PPL ICP and incorporates the following changes:

Eliminates the potential to pay dividend equivalents on stock options.

Eliminates the automatic lapse of restrictions on all equity awards in the event of a "potential" change in control and requires that a termination of employment occur in the event of a change in control before restrictions lapse.

Changes the treatment of outstanding stock options upon retirement to limit the exercise period to the earlier of the end of the term (ten years from grant) or five years after retirement.

To further align the executives’ interests with those of PPL shareowners, this plan provides that each restricted stock unit entitles the executive to accrue additional restricted stock units equal to the amount of quarterly dividends paid on PPL stock. These additional restricted stock units would be deferred and payable in shares of PPL common stock at the end of the restriction period. Dividend equivalents on restricted stock unit awards granted under the ICP and ICPKE are currently paid in cash when dividends are declared by PPL.

Under the ICP, SIP and the ICPKE (together, the Plans), restricted shares of PPL common stock, restricted stock units, performance units and stock options may be granted to officers and other key employees of PPL, PPL Energy Supply, PPL Electric, LKE and other affiliated companies. Awards under the Plans are made by the Compensation, Governance and Nominating Committee (CGNC) of the PPL Board of Directors, in the case of the ICP and SIP, and by the PPL Corporate Leadership Council (CLC), in the case of the ICPKE.

The following table details the award limits under each of the plans.

		Annual Grant Limit		Annual Grant Limit
		Total As % of		For Individual Participants -
	Total Plan	Outstanding	Annual Grant	Performance Based Awards
	Award	PPL Common Stock	Limit	For awards	For awards
	Limit	On First Day of	Options	denominated in	denominated in
Plan	(Shares)	Each Calendar Year	(Shares)	shares (Shares)	cash (in dollars)
ICP (a)	15,769,431	2%	3,000,000
SIP	10,000,000		2,000,000	750,000	$	15,000,000
ICPKE	14,199,796	2%	3,000,000

(a)Applicable to outstanding awards granted from January 27, 2006 to January 26, 2012. During 2012, the total plan award limit was reached and the ICP was replaced by the SIP.

Any portion of these awards that has not been granted may be carried over and used in any subsequent year. If any award lapses, is forfeited or the rights of the participant terminate, the shares of PPLcommon stock underlying such an award are again available for grant. Shares delivered under the Plans may be in the form of authorized and unissued PPLcommon stock, common stock held in treasury by PPL or PPLcommon stock purchased on the open market (including private purchases) in accordance with applicable securities laws.

Restricted Stock and Restricted Stock Units

Restricted shares of PPL common stock are outstanding shares with full voting and dividend rights. Restricted stock awards are granted as a retention award for select key executives and vest when the recipient reaches a certain age or meets service or other criteria set forth in the executive's restricted stock award agreement. The shares are subject to forfeiture or accelerated payout under plan provisions for termination, retirement, disability and death of employees. Restricted shares vest fully, in certain situations, as defined by each of the Plans.

The Plans allow for the grant of restricted stock units. Restricted stock units are awards based on the fair value of PPL common stock on the date of grant. Actual PPL common shares will be issued upon completion of a vesting period, generally three years.

The fair value of restricted stock and restricted stock units granted is recognized on a straight-line basis over the service period or through the date at which the employee reaches retirement eligibility. The fair value of restricted stock and restricted stock units granted to retirement-eligible employees is recognized as compensation expense immediately upon the date of grant. Recipients of restricted stock units may also be granted the right to receive dividend equivalents through the end of the restriction period or until the award is forfeited. Restricted stock and restricted stock units are subject to forfeiture or accelerated payout under the plan provisions for termination, retirement, disability and death of employees. Restricted stock and restricted stock units vest fully, in certain situations, as defined by each of the Plans.

The weighted-average grant date fair value of restricted stock and restricted stock units granted was:

	2014		2013		2012
PPL	$	31.50	$	30.30	$	28.35
PPL Energy Supply		31.70		30.42		28.29
PPL Electric		31.81		30.55		28.51
LKE		30.98		30.00		28.34

Restricted stock and restricted stock unit activity for 2014 was:

			Weighted-
			Average
		Restricted	Grant Date Fair
		Shares/Units	Value Per Share
PPL
Nonvested, beginning of period		3,140,600	$	28.50
	Granted	1,197,947		31.50
	Vested	(804,582)		26.01
	Forfeited	(48,445)		30.48
Nonvested, end of period		3,485,520		30.07
PPL Energy Supply
Nonvested, beginning of period		1,343,404	$	28.71
	Transferred	70,298		27.43
	Granted	465,238		31.70
	Vested	(395,740)		26.19
	Forfeited	(25,300)		30.54
Nonvested, end of period		1,457,900		30.13
PPL Electric
Nonvested, beginning of period		265,550	$	28.22
	Transferred	2,270		29.03
	Granted	103,511		31.81
	Vested	(78,370)		26.04
	Forfeited	(6,150)		30.65
Nonvested, end of period		286,811		30.04
LKE
Nonvested, beginning of period		231,553	$	29.17
	Granted	112,625		30.98
	Vested	(2,710)		29.97
Nonvested, end of period		341,468		29.76

Substantially all restricted stock and restricted stock unit awards are expected to vest.

The total fair value of restricted stock and restricted stock units vesting for the years ended December 31 was:

	2014		2013		2012
PPL	$	21	$	19	$	27
PPL Energy Supply		10		7		6
PPL Electric		2		3		2
LKE				1		4

Performance Units

Performance units are intended to encourage and reward future corporate performance. Performance units represent a target number of shares (Target Award) of PPL's common stock that the recipient would receive upon PPL's attainment of the applicable performance goal. Performance is determined based on total shareowner return during a three-year performance period. At the end of the period, payout is determined by comparing PPL's performance to the total shareowner return of the companies included in the Philadelphia Stock Exchange Utility Index. Awards are payable on a graduated basis based on thresholds that measure PPL's performance relative to peers that comprise the applicable index on which each years' awards are measured. Awards can be paid up to 200% of the Target Award or forfeited with no payout if performance is below a minimum established performance threshold. Dividends payable during the performance cycle accumulate and are converted into additional performance units and are payable in shares of PPL common stock upon completion of the performance period based on the determination of the CGNC of whether the performance goals have been achieved. Under the plan provisions, performance units are subject to forfeiture upon termination of employment except for retirement, disability or death of an employee, in which case the total performance units remain outstanding and are eligible for vesting through the conclusion of the performance period.

Beginning in 2014, the fair value of performance units grantedto retirement-eligible employees is recognized as compensation expense on a straight-line basis over a one-year period, the minimum vesting period required for an employee to be entitled to payout of the awards. For employees who are not retirement-eligible, compensation expense is recognized over the shorter of the three-year performance period or the period until the employee is retirement-eligible, with a minimum vesting and recognition period of one-year. The fair value of performance units granted in 2013 and 2012 is recognized as compensation expense on a straight-line basis over the three-year performance period. Performance units vest on a pro rata basis, in certain situations, as defined by each of the Plans.

The fair value of each performance unit granted was estimated using a Monte Carlo pricing model that considers stock beta, a risk-free interest rate, expected stock volatility and expected life. The stock beta was calculated comparing the risk of the individual securities to the average risk of the companies in the index group. The risk-free interest rate reflects the yield on a U.S. Treasury bond commensurate with the expected life of the performance unit. Volatility over the expected term of the performance unit is calculated using daily stock price observations for PPL and all companies in the index group and is evaluated with consideration given to prior periods that may need to be excluded based on events not likely to recur that had impacted PPL and the companies in the index group. PPLuses a mix of historic and implied volatility to value awards.

The weighted-average assumptions used in the model were:

	2014	2013	2012
Risk-free interest rate	0.75%	0.36%	0.30%
Expected stock volatility	15.80%	15.50%	19.30%
Expected life	3 years	3 years	3 years

The weighted-average grant date fair value of performance units granted was:

	2014		2013		2012
PPL	$	34.55	$	34.15	$	31.41
PPL Energy Supply		34.35		34.29		31.40
PPL Electric		34.43		33.97		31.37
LKE		34.12		33.84		31.30

Performance unit activity for 2014 was:

				Weighted-
				Average Grant
		Performance		Date Fair Value
		Units		Per Share
PPL
Nonvested, beginning of period			793,199	$	32.19
	Granted		555,553		34.55
	Vested		(177,036)		29.11
Nonvested, end of period			1,171,716		33.77
PPL Energy Supply
Nonvested, beginning of period			170,609	$	32.22
	Transferred		27,656		32.12
	Granted		138,601		34.35
	Vested		(45,374)		29.11
Nonvested, end of period			291,492		33.71
PPL Electric
Nonvested, beginning of period			38,210	$	32.22
	Granted		29,701		34.43
	Vested		(8,296)		28.99
Nonvested, end of period			59,615		33.77
LKE
Nonvested, beginning of period			129,630	$	31.88
	Granted		75,174		34.12
	Vested		(30,858)		29.20
Nonvested, end of period			173,946		33.32

The total fair value of performance units vesting for the year ended December 31, 2014 was $5 million for PPL and insignificant for PPL Energy Supply, PPL Electric and LKE.

Stock Options

PPL’s CGNC eliminated the use of stock options and changed its long-term incentive mix to 60% performance units and 40% performance-contingent restricted stock units, resulting in 100% performance-based long-term incentive mix for equity awards granted beginning in January 2014.

Under the Plans, stock options had been granted with an option exercise price per share not less than the fair value of PPL's common stock on the date of grant. Options outstanding at December 31, 2014, become exercisable in equal installments over a three-year service period beginning one year after the date of grant, assuming the individual is still employed by PPL or a subsidiary. The CGNC and CLC have discretion to accelerate the exercisability of the options, except that the exercisability of an option issued under the ICP may not be accelerated unless the individual remains employed by PPL or a subsidiary for one year from the date of grant. All options expire no later than ten years from the grant date. The options become exercisable immediately in certain situations, as defined by each of the Plans. The fair value of options granted is recognized as compensation expense on a straight-line basis over the service period or through the date at which the employee reaches retirement eligibility. The fair value of options granted to retirement-eligible employees is recognized as compensation expense immediately upon the date of grant.

The fair value of each option granted is estimated using a Black-Scholes option-pricing model. PPL uses a risk-free interest rate, expected option life, expected volatility and dividend yield to value its stock options. The risk-free interest rate reflects the yield for a U.S. Treasury Strip available on the date of grant with constant rate maturity approximating the option's expected life. Expected life is calculated based on historical exercise behavior. Volatility over the expected term of the options is evaluated with consideration given to prior periods that may need to be excluded based on events not likely to recur that had impacted PPL's volatility in those prior periods. Management's expectations for future volatility, considering potential changes to PPL's business model and other economic conditions, are also reviewed in addition to the historical data to determine the final volatility assumption. PPL uses a mix of historic and implied volatility to value awards.The dividend yield is based on several factors, including PPL's most recent dividend payment, as of the grant date and the forecasted stock price.The assumptions used in the model were:

	2013		2012
Risk-free interest rate		1.15%		1.13%
Expected option life		6.48 years		6.17 years
Expected stock volatility		18.50%		20.60%
Dividend yield		5.00%		5.00%

The weighted-average grant date fair value of options granted was:

	2013		2012
PPL	$	2.18	$	2.48
PPL Energy Supply		2.19		2.51
PPL Electric		2.19		2.50
LKE		2.18		2.51

Stock option activity for 2014 was:

						Weighted-
				Weighted		Average
				Average		Remaining		Aggregate
		Number		Exercise		Contractual		Total Intrinsic
		of Options		Price Per Share		Term (years)		Value
PPL
Outstanding at beginning of period			11,381,482	$	30.45
	Exercised		(2,338,520)		28.58
Outstanding at end of period			9,042,962		30.93		5.9	$	56
Options exercisable at end of period			6,432,806		31.60		5.2		38
PPL Energy Supply
Outstanding at beginning of period			2,845,336	$	30.47
	Transferred		458,800		30.47
	Exercised		(559,120)		28.79
Outstanding at end of period			2,745,016		30.84		5.6	$	17
Options exercisable at end of period			2,166,150		31.24		5.0		13
PPL Electric
Outstanding at beginning of period			532,200	$	30.04
	Exercised		(24,280)		30.12
Outstanding at end of period			507,920		30.04		6.3	$	3
Options exercisable at end of period			386,413		30.27		5.8		3
LKE
Outstanding at beginning of period			997,156	$	28.35
	Exercised		(373,839)		27.87
Outstanding at end of period			623,317		28.64		7.5	$	5
Options exercisable at end of period			215,106		27.58		6.9		2

Substantially all stock option awards are expected to vest.

PPL received $67 million in cash from stock options exercised in 2014. The related income tax benefits realized were not significant.

The total intrinsic value of stock options exercised for 2014 was $13 million, 2013 was $6 million and was not significant for 2012.

Compensation Expense

Compensation expense for restricted stock, restricted stock units, performance units and stock options accounted for as equity awards, which for PPL Energy Supply, PPL Electric and LKE includes an allocation of PPL Services' expense, was:

	2014		2013		2012
PPL	$	63	$	52	$	49
PPL Energy Supply		33		27		23
PPL Electric		12		10		11
LKE		8		8		8

The income tax benefit related to above compensation expense was as follows:

	2014		2013		2012
PPL	$	26	$	22	$	20
PPL Energy Supply		14		11		10
PPL Electric		5		4		4
LKE		3		3		4

The income tax benefit PPL realized from stock-based awards vested or exercised for 2014 was $4 million and was not significant for 2013 and 2012.

At December 31, 2014, unrecognized compensation expense related to nonvestedrestricted stock, restricted stock units, performance units and stock option awards was:

			Weighted-
	Unrecognized		Average
	Compensation		Period for
	Expense		Recognition
PPL	$	27		1.7 years
PPL Energy Supply		13		1.8 years
PPL Electric		3		1.8 years
LKE		2		1.3 years