X0303 4 2010-03-25 0 0001093691 PLUG POWER INC PLUG 0001474050 Hansen Erik J 968 ALBANY SHAKER ROAD LATHAM NY 12110 0 1 0 0 VP & GM, Motive Power Division Plug Power Common Stock 2010-03-25 4 P 0 10000 0.74 A 54633 D The price provided in Column 4 is a weighted average price. These shares were purcahsed in multiple transactions at prices ranging from $0.73955 to $0.74, inclusive. The reporting person under takes to provide Plug Power Inc., any security holder of Plug Power Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range specified above. /s/ Gerard L. Conway, Jr., Attorney in Fact 2010-03-26