the corporation shall be non-profit and shall devote all its returns from its capital investment as well as excess revenues from its operation , for expansion , to enable the corporation to pay its indebtedness and obligations and in furtherance and effective implementation of the policy enunciated in section one of this act , the corporation , including its subsidiaries , is hereby declared exempt from the payment of all forms of taxes , duties , fees , imposts as well as costs and service fees including filing fees , appeal bonds , supersedeas bonds , in any court or administrative proceedings .