Sec. 600.7. Relationship of other property of applicant

They shall also set forth the location, rated capacity and actual power output of all power plants owned or operated by the applicant, whatever the motive power thereof may be; the location of all water power sites, whether developed or undeveloped, owned or operated by the applicant, and the power, or additional power, which may be obtained by a proper and economical development effected at each such developed or only partially developed site; what developments, extensions or enlargements, if any, of said sites or plants are planned or under consideration by the applicant; the markets supplied by existing plants; the relationship, if any, of the applicant's existing plants to the project in connection with which a license is sought from the commission, and the relationship, if any, of the project plant to any other hydro-electric plants.