BUZZ-Plug Power Inc: Signs expansion contract with Walmart Canada
** Fuel cell maker's shares up 6.3 pct at $2.85 premarket
** Company announces expansion contract with Walmart Canada to provide 124 GenDrive fuel cells for new building in Balzac, Alberta
** Plug Power says expansion adds on to fleet in operation since 2010 and brings GenDrive total upwards of 230 units at site
** Walmart Canada to also receive GenFuel infrastructure to support Balzac distribution center
** Up to Monday's close, stock had fallen about 39 pct in past 12 months
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