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This paper describes the evolution of the high voltage d.c. capacitors, starting from filters to energy storage applications. This evolution was relatively slow, up to the beginning ofthe 90's. The new requirements, which later appeared, led to profound changes in the basic design, thanks to a combination of existing but seemingly incompatible raw materials. The successful experiences obtained with filter capacitors were followed by a technology transfer to the energy storage field, with some different constraints, which necessitated a better knowledge of the performance limits of this new technology. The final result was improved safety and a pennanent control ofthe state ofthe component.