The paper first reviews some recently introduced ideas concerning the feasibility of realizing concentrator photovoltaic systems on a very large (state-wide) scale. In particular, energy and cost assumptions are re-discussed, the concepts of double and triple sustainability are recalled and used to perform a sensitivity study of the various assumed parameter values. The model is then applied to each of the southwestern states of the USA in order to assess the economic potential for each state to freeze its fossil fuel consumption at present levels and to provide all future electricity needs entirely from solar. It is found that the scheme is economically feasible for all of the states considered, varying in attractiveness from Utah (where low electricity tariffs are problematic), to California and Nevada, where the economics are by far the most attractive among all the states. (c) 2006 Elsevier Ltd. All rights reserved.