Downhole electrical submersible power generator

A method and apparatus is described for a downhole submersible electrical power generator. The electrical power generator includes a housing forming a fluid conduit. An inlet is disposed on the housing. Also, an outlet is disposed on the housing where the inlet and the outlet are adapted to allow a fluid to flow into and out of the housing, respectively. A fluid flow powered electrical power generator is disposed inside the housing and is adapted to generate electrical power from the fluid flowing through the housing. An isolation packer is disposed outside the housing between the inlet and the outlet where the isolation packer is adapted to isolate the inlet and the outlet in different zones in a wellbore.