ČEZ Group is an operator of various energy sources. Most important energy sources are listed (in the Czech Republic, if not indicated): In 2015 CEZ operated 2,3 GW of hydro power plants in Europe and Asia, including the biggest pump storages. ČEZ Group has invested more than CZK 200bn in development and in environmental measures during its modern history to increase efficiency and reduce emission of its power plants. Today, the ČEZ brand represents energy producers or suppliers in a total of 7 countries. Source: Annual Reports  Source:Helgi Library; Presentation for investors - August 2015   Source:Helgi Library; Presentation for investors - August 2015   In 1994 a minor stake in the company was privatized using voucher privatization. If citizens invested all their vouchers (sold for 1000,- Kčs) in ČEZ, they gained 33 stocks (330 current shares after stock split). In 2007 the Czech government decided to gradually sell another 7% stake of ČEZ on the stock market, but due to the stock price fall during spring 2009, affected by financial crisis, selling was suspended. In 2008 the company decided to repurchase 9% of the company's shares. As of December 31, 2011, the Czech Republic represented by Ministry of Finance remained the company's largest shareholder with 69.78% stake in the stated capital. Other shareholders included:  The company is traded on the Prague, Warsaw, Frankfurt and RM-SYSTÉM Czech stock exchanges. and since 2001 company is paying annual dividends. The building of a network of public charging stations for electric vehicles got fully underway in 2011. The first public charging station – in front of ČEZ's headquarters in Prague's Duhová Street – opened on November 30, 2011. As of December 2011, seven CEZ Group public charging stations were in operation, in Prague and Chrášťany, Prague-West district. ČEZ's given charities electric cars to use and test. Between 50 and 100 electric cars being made available over the coming years. The first two vehicles – a Fiat Fiorino Combi and a Fiat Fiorino Cargo – went to a senior citizen health care charity based in Prague. ČEZ is the largest utility and biggest public company in Central and Eastern Europe. Its influence on the Czech politics and connections to Russia have recently come under scrutiny. According to the Economist, "though nominally state-run, many see the power flowing the other way: from ČEZ’s board into politics".