[en] This paper discusses achievements in enabling technology developments for the conductively coupled multi-couple thermoelectric cell being designed by GE for the SP-100 nuclear power reactor. The test results of cell ingradient testing and the correlation to pretest performance predictions are discussed. First of a kind technology developments on the single crystal high voltage insulator and its compatibility with lithium containing system and strain absorbing compliant pads are reported on. The SP-100 thermoelectric cell has been brought to a state of development where its feasibility as the basic power conversion building block for future nuclear space power missions has been firmly established and the key enabling technology issues have been resolved