(SeeNews) - May 2, 2013 - Itaipu Binacional, the Brazilian-Paraguayan operator of the Itaipu hydroelectric power plant (HPP), and Brazil's agricultural research agency Embrapa agreed to invest BRL 7.5 million (USD 3.7m/EUR 2.9m) in research and development (R&D) of biogas and biofertilisers.