Аннотация:This paper is devoted to calculation of yearly energy production, demanded areaand capital costs for first Russian 5 MW grid-tie photovoltaic (PV) plant in Altay Republic thatis named Kosh-Agach. Simple linear calculation model, involving average solar radiation andtemperature data, grid-tie inverter power-efficiency dependence and PV modules parameters isproposed. Monthly and yearly energy production, equipment costs and demanded area for PVplant are estimated for mono-, polycrystalline and amorphous modules. Calculation includesthree types of initial radiation and temperature data—average day for every month from NASASSE, average radiation and temperature for each day of the year from NASA POWER andtypical meteorology year generated from average data for every month. The peculiarities foreach type of initial data and their influence on results are discussed.