An apparatus for generating at least one electric arc within a well drilled into a geological formation (10, 12, 14), the apparatus being an open electrical pulsed power circuit, "OEC", comprising: a. at least one surface based pulsed power source system, "PPS", not deployed within the well; and b. at least one electrically connected electrical power transmission tubular, "PTT", that is capable of transmitting electrical power surges and that can retain, convey, position, and / or re-position at least one downhole tool within the well; and c. at least one plasma emitter tool, "PET", system, retaining at least one pair of electrodes (150, 155), and is electrically and mechanically interconnected to the PTT; and d. the PET electrodes (150, 155) forming at least one spark gap between them; and e. at least one of the electrodes (150, 155) is the live electrode, "LE", that is electrically connected to the PTT; and f. at least one of the electrodes (150, 155) being an electrically grounded electrode; and g. collectively the components thereby forming an OEC; wherein the PTT provides a conduit for a means to initiate a Magnetohydrodynamic Plasma Spark, "MPS"; and wherein the surface based pulsed power source comprises: a. at least one electrical power generation system means; and / or b. at least one electrical energy storage system means; and c. at least one system means for generating at least one short duration rise time electrical surge pulse discharge of sufficient power compression level to produce a MPS between the electrodes, the MPS concomitantly generating at least one of each, an electromagnetic energy wave, an acoustic wave and a hydrodynamic wave; and d. at least one power control, operating and discharge command and control system means. a. at least one surface based pulsed power source system, "PPS", not deployed within the well; and b. at least one electrically connected electrical power transmission tubular, "PTT", that is capable of transmitting electrical power surges and that can retain, convey, position, and / or re-position at least one downhole tool within the well; and c. at least one plasma emitter tool, "PET", system, retaining at least one pair of electrodes (150, 155), and is electrically and mechanically interconnected to the PTT; and d. the PET electrodes (150, 155) forming at least one spark gap between them; and e. at least one of the electrodes (150, 155) is the live electrode, "LE", that is electrically connected to the PTT; and f. at least one of the electrodes (150, 155) being an electrically grounded electrode; and g. collectively the components thereby forming an OEC; wherein the PTT provides a conduit for a means to initiate a Magnetohydrodynamic Plasma Spark, "MPS"; and wherein the surface based pulsed power source comprises: a. at least one electrical power generation system means; and / or b. at least one electrical energy storage system means; and c. at least one system means for generating at least one short duration rise time electrical surge pulse discharge of sufficient power compression level to produce a MPS between the electrodes, the MPS concomitantly generating at least one of each, an electromagnetic energy wave, an acoustic wave and a hydrodynamic wave; and d. at least one power control, operating and discharge command and control system means. a. at least one electrical power generation system means; and / or b. at least one electrical energy storage system means; and c. at least one system means for generating at least one short duration rise time electrical surge pulse discharge of sufficient power compression level to produce a MPS between the electrodes, the MPS concomitantly generating at least one of each, an electromagnetic energy wave, an acoustic wave and a hydrodynamic wave; and d. at least one power control, operating and discharge command and control system means.