The design and cost estimates compared with other systems of an energy-producing reactor system are presented. Heat from hydrino reactions within individual cells provides both the reactor power and the heat for regeneration of the reactants. These processes occur continuously over a plurality of cells in different phases of the processes. The hydrino reactions are maintained and regenerated in a batch mode using thermally coupled multi-cells arranged in bundles wherein cells in the power-production phase of the cycle heat cells in the regeneration phase. In this intermittent cell power design, the thermal power is statistically constant as the cell number becomes large, or the cell cycle is controlled to achieve steady power. The conversion of thermal power to electrical power requires the use of a heat engine exploiting a cycle such as a Rankine, Brayton, Stirling, or steam-engine cycle (Int. J. Energy Res. 1997; 21:113127; Int. J. Energy Res. 1998; 22:237248; Int. J. Energy Res. 1998; 22:9911000; Int. J. Energy Res. 2010; 34:10711087; Int. J. Energy Res. 2009; 33:12031232). Owing to the temperatures, economy goal, and efficiency, the Rankine cycle is the most practical and can produce electricity from a steam source at 3040% efficiency with a component capital cost of about $300 per kW electric. Conservatively, assuming a conversion efficiency of 25%, the total cost with the addition of the boiler and chemical components is estimated at $1380 per kW electric. The system applications for distributed power (110?MW electric) and central generation retrofit and green-field projects are projected to be very competitive relative to existing power sources and systems. Copyright (C) 2011 John Wiley & Sons, Ltd.