See also GRAPHICS: http://link.reuters.com/ven45wABUNDANT ENERGY* Iceland produces enough energy to power 1.65 million homes in a year, far more than its 300,000-strong population, according to 2013 data from Iceland's energy authority and Reuters calculations.* The excess energy goes to three aluminum smelters owned by the likes of Rio Tinto and Alcoa with a total capacity of 820 million tonnes a year.* Its energy infrastructure is the world's best according to the World Competitiveness Yearbook 2015 from the Swiss-based IMD Business School. * It produces more power per capita than any country in the world according to the World Economic Forum.CABLE CAPACITY AND SPEED* Cables connect Iceland to the United States via Greenland and Canada, to Britain and to mainland Europe via Denmark and Germany.* Cable has a capacity of 1.9 terabits per second (Tbps) to Canada, from where data can continue through to the United States.* Cable to Britain has a capacity of 8 Tbps and there is a capacity of 24.8 Tbps to Denmark and Germany.* Iceland plans to expand this capacity but the government-backed Invest in Iceland did not wish to disclose by how much.* Data can be transferred more quickly from Reykjavik to New York than from the Finnish and Swedish data center locations, according to a latency study provided by Invest in Iceland.* Data transfers to London have roughly the same speed from Iceland, Finland and Norway. (Reporting by Alxeander Tange; editing by Philippa Fletcher)