Hybrid power systems for equipment used in subterranean field operations

An on-site substation for providing power to field equipment for subterranean field operations, the on-site substation comprising:

• a first channel configured to receive utility power from a utility power source;
• a second channel configured to receive reserve power from a portable energy storage device module;
• a third channel configured to deliver the utility power and the reserve power to the field equipment;
• and
• a controller configured to:
• determine, at a time, that a demand level of the field equipment exceeds a setpoint value of the utility power;
• limit the utility power to the setpoint value;
• deliver the utility power at the setpoint value to the field equipment through the third channel;
• control the portable energy storage device module to deliver the reserve power at a remaining level to the second channel, wherein the setpoint value and the remaining level substantially equals the demand level of the field equipment;
• and
• deliver the reserve power at the remaining level to the field equipment through the third channel.

A method for providing power to field equipment for subterranean field operations, the method comprising:

• determining, at a time, that a demand level of the field equipment exceeds a setpoint value of a utility generation source;
• controlling a portable energy storage device module to release reserve power;
• and
• controlling an on-site substation to deliver utility power from the utility generation source at the setpoint value and the reserve power at a remaining level to the field equipment, wherein the setpoint value and the remaining level substantially equals the demand level of the field equipment.