Mexico's Maremotrices de Energias Renovables (Marersa) is currently negotiating for the implantation of its wave power technology at sites in Colombia, Costa Rica, Guatemala, Panama and the Dominican Republic, according to Francisco Javier Carrion Cuellar, the director general of the company. Marersa is seeking patents for the technology which it developed to build its first three megawatt wave plant at Rosarita, in Baja California, about 15 miles south of Tijuana. The plant operates at close to 85 percent efficiency and was built for the equivalent cost of $2 million per megawatt, excluding the sea wall cost, he says.