In 1990’s many countries across the world embraced reforms in power sector to improve the performance in this sector. It involved restructuring of the sector - privatization of state owned utilities, vertical and horizontal deintegration, increasing competition in the generation and distribution sector and development of regulatory framework. Although the approaches to reform have varied across countries, the main objective has been to improve the economic efficiency of the sector by introducing private capital, increasing competition and introducing regulatory framework. There is ‘No one size fits all’ and is tailor made according to the needs, demography, economic, social and political conditions of the country Thus, the impact of competition on the electricity sector may produce different results depending on the design and its implementation Since India & Argentina both, have carried power reforms, but the methodology has been different. The paper studies the impact of type of competition on power sector in India & Argentina and tries to find out which form of competition has been more powerful in bringing the desired changes