O-P

OASIS(Open-Access Same-Time Information System): An electronic posting system for transmission access data that allows all transmission customers to view the data simultaneously.
odorant: A substance which is added to natural gas to give it a perceptible odor, so its presence can be detected. The odorant most commonly used is known as mercaptan.
off peak: Those hours or other periods defined by contract or other agreements or guides as periods of lower electrical demand.
old gas: Gas produced before April 1977 or from new wells drilled in old formations and not subject to deregulation under the Natural Gas Policy Act of 1978 (NPGA).
on peak: Those hours or other periods defined by contract or other agreements or guides as periods of higher electrical demand.
operating criteria: The fundamental principles of reliable interconnected system operation.
operating transmission limit: The maximum value of the most critical system operating parameter(s) which meets: (a) precontingency criteria as determined by equipment loading capability and acceptable voltage conditions, (b) transient performance criteria or, (c) postcontingency loading and voltage criteria.
parallel operation: The simultaneous operation of a distributed generator with power delivered or received by the electrical corporation while interconnected. For the purpose of this rule, parallel operation includes only those generators that are so interconnected with the distribution system for more than 60 cycles.
parallel path flows: Electricity dispatched from the generator to the customer can flow through all the lines connecting the two. When electricity flows along...

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