What does “SVEC will lease fiber space out” mean?

The cable that we are installing consists of multiple fibers. SVEC will only need a portion of those fibers to serve our electric needs. The “extra” fibers can be leased to ISPs. ISPs would use these fibers to bring internet service to points along the cable in areas that are not served. From those points, the ISP could run fiber to the premises to provide broadband service.