BUZZ-Alter NRG Corp: Shares touch four-year high
** Canadian renewable energy company's shares up 14.3 pct at more than four-year high of C$4.97
** Says a U.S. national security watchdog completed investigation into offer by a unit of Harvest International New Energy Co Ltd to buy Alter NRG
** Alter NRG says Committee on Foreign Investment in the United States (CFIUS) has determined that there are no unresolved national security concerns related to the offer
** Says offer open for acceptance until July 24
** Up to Monday's close, stock had risen 66 pct this year
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