Brazilian hydroelectric power

[7n7is]

Brazil produces a lot of their electricity from hydroelectric power plants. I guess that makes sense since there's a lot of rivers in South America. I noticed that there were some Brazilian members on the forums. What do you think about investing in these three Brazilian utilities?

CPFL Energia S.A. (CPL), Companhia Energetica de Minas Gerais [CEMIG] (CIG) and Companhia Paranaense de Energia [COPEL] (ELP), also known as COPEL

In this article
http://seekingalpha.com/article/64063-four-brazilian-utility-stocks-to-light-up-your-portfolio
it says that CIG gets 82.6% of their electricity from 8 hydroelectric plants and 99.6 percent of ELP's power is hydroelectric. CPL has 23 small hydroelectric generation facilities, but it doesn't say what percentage of their power is hydroelectric.

CPL's investor information in English: http://www.cpfl.com.br/ir/

It says here http://www.cpfl.com.br/ir/ under Brazilian Electricity Sector

In 2002, the MME (defined below) approved a ten-year expansion plan under which Brazil´s installed power generation capacity is projected to increase to 129.9 GW by 2015, of which 98.0 GW (75.4%) is projected to be hydroelectric, 23.3 GW (18.0%) is projected to be thermoelectric and 8.6 GW (6.6%) is projected to be imported through the Interconnected Power System.

In 2006, Eletrobrás owned 42% of Brazilian generation assets. Through its subsidiaries, Eletrobrás is also responsible for 58% of Brazil ´s installed transmission capacity above 230 kV. In addition, some Brazilian states control entities involved in the generation, transmission and distribution of electricity. They include, among others, Companhia Energética de São Paulo — CESP and Companhia Energética de Minas Gerais — CEMIG.

Private companies had 27% and 70% of the market for generation and distribution activities, in terms of total capacity and demand, respectively, and 21% of the transmission market, in terms of revenue.

Also, are there a lot of environmentalist groups in Brazil that criticize energy companies?