A Telluric Current Simulator for Pipelines D.H. Boteler, L. Trichtchenko, C. Blais, R. Pirjola Geomagnetic Laboratory Natural Resources Canada 2617 Anderson Road Ottawa, Ontario K1A 0E7 ABSTRACT Telluric currents due to geomagnetic field variations have long been known to cause variations in pipe-to-soil potentials (PSP) on pipelines. These are incr easingly being taken into account in the design of cathodic protection systems for new pipelines. Online services are available for modelling telluric currents but cannot handle all pipeline configurations . This paper describes the development of a new telluric simulator, based on a more versatile modeling technique that can include more details of a pipeline such as branches and ot her features. This can show the pipe-to-soil poten tials produced by specified telluric electric fields. De scriptions are also provided for features of the telluric simulator that allow modeling of the pipeline response using elec tric fields calculated for past geomagnetic disturbances.