Coupling electrically-produced non-thermal plasmas (NTPs) with NO_x storage-reduction (NSR) catalysts provides a promising approach for improving catalyst NO_x removal efficiency, particularly at low operating temperatures. Under lean conditions, plasma can be applied to facilitate NO oxidation to NO₂, thereby improving NO_x storage efficiency. The use of plasma during rich NSR catalyst purging increases the extent of NO_x release and reduction, enabling catalyst regeneration at temperatures as low as ambient. In this chapter the literature concerning NTP-assisted NSR catalyst operation is reviewed and the underpinning mechanisms considered. The advantages and disadvantages of this concept are highlighted and the prospects for commercial application of the technology are discussed.