An assessment of made a calculation to produce electric power in Kyrgyz Republic energy system. Characteristic of basic lowland water reservoirs within Tien-Shan in Kyrgyz Republic. Investigation of water resources and water usage. Adjusted data certify of that in spite of favorable forecast of increasing water resources due to climate changing seemingly Kyrgyz Republic fully provides the own water demand under realization of accelerative scenario, neighboring countries located on lowland in down streams will feel the water shortage in the foreseeable future. Providing the economic-drinking needs of population will be becoming most priority to taking in account increasing the water demand of per head.