You should be asking about Shuozhou Local Electric Power Co., Ltd., and it seems that there is only Shuozhou in Shanxi. In Shuozhou, the relationship between ground and electricity is more severe than that of Guodian. Some Guodian can't occupy land to build lines, but Geotechnical can.
A simple understanding is that one is national and the other is local. I don't know the specific affiliation.