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To help you understand the key issues facing our industry, please use the following glossary of terms:  

A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z

Office of Ratepayer Advocates (ORA)
The Office of Ratepayer Advocates is an independent arm of the CPUC that represents consumers in commission proceedings, pursuant to statute.

Oil Circuit Breaker (OCB)
A device that opens an alternating current circuit in a tank of oil which extinguishes the arc. It is also called an oil switch.

Once-through cooling
Once-through cooling –The process used by some power plants by which water is drawn from a source such as an ocean or river and circulated through a condenser where it cools steam used to turn the plant's turbines. In contrast to "closed-loop" systems that reuse water, "once-through" systems pass water through the plant and immediately return it to its source.

Operating Reserves
The amount of electricity generation that is instantly available in excess of current demand.


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The other Edison International companies are not the same companies as Southern California Edison (SCE), the utility, and are not regulated by the California Public Utilities Commission.