WASHINGTON, Feb. 10 /PRNewswire/ -- The world's nuclear generators in 2005 appear to have matched their record 2004 output, according to Platts Nucleonics Week. Platts is the energy information business of the McGraw-Hill Companies. Platts calculated the nuclear total at 2.75-billion gross megawatt-hours (MWh). In 2004, the total was approximately 2.742-billion. The largest increase was recorded in South Korea, where addition of a new 1,000-MW unit helped the national total increase by 16-million MWh. The operators of the 103 nuclear units in the U.S. came within 10-million MWh of their 2004 record of 828-million gross MWh. "The most striking thing in these numbers is how much potential is still left, even with record generation," said Margaret Ryan, editorial director of Platts' global nuclear publications. "Nuclear units are putting out more power than ever before, and there are some places including the U.S. where operators have made measurable gains. But the numbers show many cases where reactors are far from maxed out. There is still a lot of energy potential out there." Nucleonics Week traditionally lists the 50 most efficient generators by capacity factor and the 50 largest generators. For 2005, the highest capacity factors were recorded by Korea Electric Power's Kori-4,Yonggwang-1 and -3, and Wolsong-3, in the U.S. by Constellation's Calvert Cliffs-1, Exelon's Limerick-1 and Duke Energy's Catawba-2, and in Japan by Chubu Electric Power's Hamaoka-4 and -5. The largest generators were led by German units including Brokdorf, Isar-2, Neckar-2, Grohnde, Emsland, and Philippsburg-2, by Japan's Hamaoka-5 and Kashiwazaki-6, France's Paluel-1, and Lithuania's Ignalina-2. Platts Nucleonics Week tracks nuclear power plant performance worldwide monthly, and annually publishes this exclusive analysis of performance by nation and reactor vendor, including listing the top 50 performers. For more information visit http://www.nucweek.platts.com . Platts is the world leader in providing energy information. For nearly a century, Platts has helped to enable ever-changing global energy markets enhance their performance through such offerings as independent industry news and price benchmarks. From 15 offices worldwide, Platts covers the oil, natural gas, electricity, nuclear power, coal, petrochemical and metals markets. Additional information on Platts real-time news and price assessment services, publications, databases, geospatial tools, conferences, magazines, research and analytical services and energy financial services is available at http://www.platts.com . About The McGraw-Hill Companies Founded in 1888, The McGraw-Hill Companies is a leading global information services provider meeting worldwide needs in the financial services, education and business information markets through leading brands such as Standard & Poor's, McGraw-Hill Education, BusinessWeek and J.D. Power and Associates. The Corporation has more than 290 offices in 38 countries. Sales in 2005 were $6.0 billion. Additional information is available at http://www.mcgraw-hill.com .