During 2010-2013, Baltic Countries (Estonia, Latvia, Lithuania), deregulated their power markets and joined the Nord-Pool market. Today, major share of electricity in Baltic countries is produced from fossil fuels. Over the past years, the increasing penetration of renewable energy systems intensified in order to meet the European targets. In particular, installing wind power dramatically rises as a result of a great potential in Northern Europe. This paper attempts to provide an overview of the possible impacts of growing wind power on market power potential in Baltic countries’ electricity market. The Herfindahl-Hirschman Index (HHI), which is a common measure of market concentration, is chosen to conduct this exploratory study. HHI index trend in Baltic over the years is evaluated and compared with the rise of wind power. The results show how Baltic area is a highly concentrated marketplace, but wind power is partly changing this.