PLUG POWER INC — Director's Dealing 2011

Sep 30, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PLUG POWER INC (PLUG)
CIK: 0001093691
Period of Report: 2011-09-20

Reporting Person: HELMER MAUREEN O (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-09-20	Option to Purchase Plug Power Common Stock	$1.93	A	65000	Acquired	2021-09-20	Plug Power Common Stock (65000)	Direct

Footnotes

F1: Awarded pursuant to Plug Power's 2011 Stock Option and Incentive Plan.

F2: Consists of an option to acquire common stock granted on September 20, 2011 with respect to which: 21,667 shares will become exercisable on September 20, 2012; 21,667 shares will become exercisable on September 20, 2013; 21,666 shares will become exercisable on September 20, 2014.

F3: 1,500 granted on 2/12/2004 exercise price $93.90; 1,000 granted on 5/20/2004 exercise price $75.00; 1,000 granted on 6/1/2005 exercise price $62.20; 1,200 granted on 6/28/2006 exercise price $46.40; 1,200 granted on 5/17/2007 exercise price $29.80; 1,200 granted on 5/21/2008 exercise price $32.10; 1,200 granted on 5/20/2009 exercise price $9.50; 12,500 granted 5/20/2009 exercise price $9.50; 1,200 granted on 5/19/2010 exercise price $4.80; 1,200 granted on 5/12/2011 exercise price $5.10.