josé manuel pérez rodriguez is a coal engineer and now edp's head of hydrogen conversion.use we already have the electric connections. we already have the water. we are next to the sea, next to the port to make exports of the hydrogen produced. we think it makes a lot of sense. eric: it's not just the falling costs of clean energy that are driving the change; it's the rising cost of carbon. in 2005, europe introduced the world's first international emissions trading scheme. in may the price doubled to $80 a ton, sending electricity prices soaring. josé: the main cost of producing electricity with coal is the co2. so there are market reasons and environmental reasons that are linked. and, of course, the investors are demanding us that we make this change. eric: well, you grew up in asturias, a coal region, you're a coal engineer, could you have ever imagined this happening? josé: no, never. no, when i started 20 years ago, it was all around the coal. i mean, gasification of coal, making fuels from coal, making power plants from coal. so, and i studied, as well, the pv techn