Systems and methods for providing monitored and controlled cathodic protection potential

A method for providing subsea corrosion protection, comprising:

• determining at least one electrical potential at at least one reference electrode disposed at at least one location along a subsea structure formed at least in part of steel;
• comparing, using a controller, the at least one electrical potential to at least one preset limit;
• determining current load to the subsea structure;
• based on the comparing of the at least one electrical potential to the at least one preset limit, and the current load to the subsea structure, adjusting, using a variable resistor, current flow from a sacrificial anode to specific connection regions disposed at a variety of locations on the subsea structure to attain and modulate a cathodic protection level within a range of −800 millivolts (mV) to −950 mV;
• providing current to the controller at a subsea location via a topside power source;
• and
• supplying current to the controller from a backup power supply to operate the controller to control voltage levels applied to the subsea structure and maintain cathodic protection levels between −800 mV and −950 mV in the absence of power from the topside power source;
• wherein the backup power supply is a subsea anode bank.