This joint report by the International Energy Agency (IEA) and the OECD Nuclear Energy Agency (NEA) is the seventh in the long established series of studies into electricity generating costs. It presents the main results of the work carried out in 2009 for calculating the costs of generating baseload electricity. The study is quite comprehensive in covering almost all financial aspects facing investors in the electricity generating system. Therefore this study although useful, its usefulness lies in explaining methodologies, mentioning factors that affect investment and cost, educating planners and improving investment evaluation and planning methodologies, its resulting figures and cost comparisons are however controversial. Generation planning and investments are case and country specific, and should be studied correspondingly and as close as possible to the timing of decision making to take account of trends. Most likely such case specific results will differ from figures calculated in the study. Therefore we need to emphasize a key conclusion of the study which is "that country-specific circumstances determine the LCOE"; it is this that needs to be considered and not the results represented in the study. (c) 2010 Elsevier Ltd. All rights reserved.