In 2007, Uruguay had a massive problem with no obvious fix. The economy of this country of 3.5 million people was growing, but there wasn't enough energy to power all that growth.Ramón Méndez Galain was, at the time, a particle physicist, but he wanted to apply his scientific mind to this issue. He started researching different energy sources and eventually wrote up a plan for how Uruguay's power grid could transition to renewable energy. It would be better for the climate, and, he thought, in the long run it would be the most economical choice Uruguay could make.Méndez Galain shared his plan online and in a series of informal lectures. Then, one day he received a phone call from the office of the president of Uruguay, inviting him to put his plan into action.Countries all over the world have announced lofty goals to reduce the emissions that cause climate change. But Uruguay actually did it. In a typical year, 98% of Uruguay's grid is powered by green energy. How did it get there? It involved a scientist, an innovative approach to infrastructure funding, and a whole lot of wind.Today's show was hosted by Erika Beras and Amanda Aroncyzk. It was produced by Willa Rubin with help from Emma Peaslee. It was engineered by Maggie Luthar, fact-checked by Sierra Juarez and edited by Keith Romer. Alex Goldmark is our executive producer.Help support Planet Money and get bonus episodes by subscribing to Planet Money+ in Apple Podcasts or at plus.npr.org/planetmoney.