[en] The problems of operating nuclear power plants (NPPs) within an electric grid of limited capacity have long been a serious concern to electric utilities because of the grid's direct bearing on the starting and running of the NPP. Strong caution has been expressed concerning typical system characteristics to be considered, since it must be recognized that each power system has unique characteristics and most likely will require solutions that are necessarily system specific. This Guidebook cannot provide solutions that can be applied directly to single-case problems. It provides general guidance, describes some typical problems and suggests corrective actions so that planners, designers and operators of electric utilities in developing countries can identify in good time critical problem areas to be carefully considered when tender specifications are established and supply contracts negotiated. Regarding possible remedial actions suggested in this Guidebook, its users should bear in mind that the viability of the proposed solutions for their specific situation should be verified, balancing the possible improvements against the financial commitments they may involve. In this respect, throughout the Guidebook the term recommendation is intentionally avoided, since the users should not be directed to any solution without having first evaluated its viability through a cost/benefit assessment