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Originally posted by Hurricane James
hello everyone, I don't post to often, but this is something I am intamently familiar with, seeing as I work for the power company controlling their transmission and generation dispatching.
Florida is unique in the US in that it is not surrounded by land but water. This means that we are only connected to Georgia via two 500KV power lines. Those lines are known as the backbone of the state's power grid because if there are any faults alontg these lines it will cause voltage problems throughout the state. These voltage problems could lead to blackouts like the one in this thread.
These two power lines terminate at Turkey point substation. A fault at that substation will take out both 500kv power lines in south Florida. That fault will also cause both Turkey point nuclear plant to go offline. This is by design to prevent damage to the plants.
The turkey point generating stations combined produce nearly 3000 megawatts of power. This time of yaer the normal power requirements(load) for the entire state of Florida is about 30,000 mw's. by loosins the turkey point substation, the state lost 10% of the power generation for the state. This will lead to lower voltages throughout the areas nearest the fault. Automatic protective schemes will open breakers nearest the fault to reduce load, by blacking out customes until the voltages return to normal bands. This is done to preserve the entire electrical power grid in the state.
If these schemes did not operate, the entire state could potentially lose power. This could cascade to affect the entire eastern seaboard.
The 2003 blackout that affected the midwest and northeast was caused by a tree that had grown into a power line and causing a ground that tripped the line out.
Another factor that probally made this worse is that this is the time of the year the power companies do most of their maintenace because of the lower loads from the cooler weather. Therefore there are fewer alternate paths for the power to flow whenever a line is lost. When was the last time you remember a major outage such as this one during the summer. I'm talking about 3 million customers without power in August that wasn't caused by a Hurricane. This is because every line is in during the summer months to provide as many alternate paths for power in case of a contingency in which a line is lost.
The power companies do a such a great job of keeping the lights on that it only makes news when they have a catastrophic failure. Equipment fails sometimes, enjoy the quiet and have some fun outside. Just be happy it isn't 95 degrees outside.