Costa Rica does not maintain a standing army (minor policing, border patrol, and a commando unit - company of 70 men); they informally rely on the U.S.'s army due to the U.S. - Costa Rica relationship. Also the U.S. forgave Costa Rican debt for forest conservation. These and other factors leave some of the GDP for investment in infrastructure like renewables. Other than building or damming another waterway, upgrading or increasing the number of generators, the ability to simply add capacity is limited with hydro.