July 27 (Reuters) - Boralex Inc BLX.TO
* La Caisse acquires a 17.3% interest in Boralex Inc
* Boralex - caisse De Dépôt Et Placement Du Québec has acquired all of class a common shares of Boralex held by Cascades Inc for amount of $287.5 million
* Boralex - La Caisse will appoint two independent directors to co's board and will have pre-emptive rights with respect to future issuances of shares
* Boralex - as part of deal, co, La Caisse agreed to explore partnership opportunities with respect to investing in future projects developed by Boralex
* Boralex Inc - class A common shares of Boralex held by Cascades represents 17.3 percent of outstanding shares of co
* Says La Caisse acquired all of class A common shares of Boralex held by Cascades Inc for $287.5 million