A power system depending entirely on renewable energy is not reliable due to its intermission and dependence on the weather. When the penetration of renewable energy is a high, the energy technology or support needs to be more integrated. But this encounters many barriers to investment costs and operation. This study models Vietnam power system in 2030 with the penetration of renewable energy sources and storage resources based on open source Pypsa. The average costs of system will be calculated by resolved techno-economic optimization model. Results show that the deployment of renewable energy in Vietnam depends on the variation in the cost of technology in the future and support policies of the government.