Stockholders' Equity

3 Months Ended

Mar. 31, 2013

Stockholders Equity Note [Abstract]

Stockholders' Equity

5. Stockholders’ Equity

Changes in stockholders’ equity for the three months ended March 31, 2013 are as follows:

	Accumulated
									Other									Total
			Common Stock			Additional Paid-			Comprehensive		Treasury Stock					Accumulated		Stockholders'
	Shares			Amount			in-Capital		Income (Loss)		Shares	Amount			Deficit			Equity
December 31, 2012		38,404,764		$	384,048		$	801,840,491	$	1,004,412	165,906		$	(1,552,382)		$	(786,646,266)	$	15,030,303
Net loss			-	-			-		-		-		-			(8,576,379)		(8,576,379)
Other comprehensive loss			-	-			-		(38,655)		-		-			-		(38,655)
Stock based compensation		790,233		7,902			505,820		-		-		-			-		513,722
Public Offering, common stock, net		21,711,800		217,118			(354,586)		-		-		-			-		(137,468)
Exercise of warrants (1)		2,900,000		29,000			889,512		-		-		-			-		918,512
March 31, 2013		63,806,797		$	638,068		$	802,881,237	$	965,757	165,906		$	(1,552,382)		$	(795,222,645)	$	7,710,035

(1)     Pursuant to the exercise of the warrants, additional paid-in capital was increased by $406,000 from the issuance of 2,900,000 shares of common stock. Additionally, paid-in capital was increased by $483,512 and warrant liability was  reduced by $483,512, the fair value of the warrants on the exercise date. 

As discussed further below, the Company offered common stock and warrants in connection with its 2013 public offerings. The associated warrants have been separately valued and classified as a liability on the accompanying consolidated balance sheet. After consideration of the fair value ascribed to the warrants and the net proceeds of the overall offering, it was determined that the fair value of the warrants and the common stock exceeded the net proceeds received as part of the offering and consequently additional paid-in capital was reduced by $354,586.

2013 Public Offerings

On February 20, 2013, the Company completed an underwritten public offering of 18,910,000 shares of common stock and warrants to purchase an aggregate of 18,910,000 shares of common stock. The shares and warrants in the underwritten public offering were sold as a fixed combination, with each combination consisting of one share of common stock and one warrant to purchase one share of common stock at a price to the public of $0.15 per fixed combination. The underwriter also purchased 2,836,500 warrants pursuant to the exercise of its over-allotment option.  These warrants have an exercise price of $0.15 per share, are immediately exercisable and will expire on February 20, 2018.  The warrants are subject to weighted average anti-dilution provisions in the event of issuance of additional shares of common stock and certain other conditions, as further described in the warrant agreement. Additionally, in the event of a sale of the Company, and under certain conditions, each warrant holder has the right to require the Company to purchase such holder’s warrants at a price determined using a Black-Scholes option pricing model. The underwriter was also granted an additional 1,891,000 warrants at $0.18 per share.  These warrants are exercisable on February 13, 2014 and will expire on February 13, 2018.  Net proceeds, after underwriting discounts and commissions and other fees and expenses payable by Plug Power, were $1,948,766. The Company intends to use the net proceeds of the offering for working capital and other general corporate purposes, including capital expenditures.

On February 21, 2013, the Company sold 2,801,800 additional shares of common stock, pursuant to the underwriter’s exercise of its overallotment option in connection with the public offering, resulting in additional net proceeds to the Company of approximately $364,794.

2012 Public Offerings

On March 28, 2012, the Company completed an underwritten public offering of 13,000,000 shares of its common stock. The shares were sold at $1.15 per share.  Net proceeds, after underwriting discounts and commissions and other fees and expenses payable by Plug Power were $13,704,745. 

On March 29, 2012, the Company sold 1,950,000 additional shares of common stock at $1.15 per share, pursuant to the underwriter’s exercise of its over-allotment option in connection with the March 28, 2012 underwritten public offering, resulting in additional net proceeds to Plug Power of $2,085,525.

2011 Public Offerings

On May 31, 2011, the Company completed an underwritten public offering of 8,265,000 shares of its common stock and warrants to purchase an aggregate of 7,128,563 shares of common stock (including warrants to purchase an aggregate of 929,813 shares of common stock purchased by the underwriter pursuant to the exercise of its over-allotment option). Net proceeds, after underwriting discounts and commissions and other fees and expenses payable by Plug Power, were $18,289,883 (of this amount $8,768,143 in fair value was recorded as common stock warranty liability at issuance date). The shares and the warrants were sold together as a fixed combination, with each combination consisting of one share of common stock and 0.75 of a warrant to purchase one share of common stock, at a price to the public of $2.42 per fixed combination. The warrants are exercisable upon issuance and will expire on May 31, 2016. The exercise price of the warrants upon issuance was $3.00 per share of common stock and is subject to weighted average anti-dilution provisions in the event of issuance of additional shares of common stock and certain other conditions, as further described in the warrant agreement. Additionally, in the event of a sale of the Company, and under certain conditions, each warrant holder has the right to require the Company to purchase such holder’s warrants at a price determined using a Black-Scholes option pricing model. As a result of the March 28 and 29, 2012 public offerings and pursuant to the effect of the anti-dilution provisions, the exercise price of the warrants was reduced to $2.27 per share of common stock. Simultaneously with the adjustment to the exercise price, the number of common stock shares that may be purchased upon exercise of the warrants was increased to 9,421,008 shares.  As a result of the February 20 and 21, 2013 public offerings and pursuant to the effect of the anti-dilution provisions, the exercise price of the warrants was reduced to $1.13 per share of common stock.  Simultaneously with the adjustment to the exercise price, the number of common stock shares that may be purchased upon exercise was increased to 18,925,389 shares.

On June 8, 2011, the Company sold 836,750 additional shares of common stock, pursuant to the underwriter’s partial exercise of its over-allotment option, resulting in additional net proceeds to Plug Power of $1,874,990.

On July 1, 2011, the Company sold 231,000 additional shares of common stock, pursuant to the underwriter’s partial exercise of its over-allotment option, resulting in additional net proceeds to Plug Power of $527,626.