GST Gst on electricity

Dear Sir,
We are Mall company. We charged to our unit holder electricity on cost to cost basis i.e no margin.
Is GST is applicable on this collection in today scenario.
As per my understanding,we should charge GST Because of Following Reasons
1).We hold title (Electricty Invoice is received in the name of Mall Company)to the goods/Service Procured on behalf of recciepent & We do not fall under Pure Agent Defination of GST.
2).We have installed Submeter at each tenant level at our Mall and We Personally Go & Read the Meter raise the Invoices accordingly..
KIndly Suggest and correct me if we wrong.
Thanks & Regards,