Power Generation

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I look at it this way and as I understand it. The generators generating voltage is limited by it's insulation. What voltage is actually transmitting is a voltage that is stepped up to a transmission voltage via step-up transformers outside the generating plant.
So if one plants generators generate at a lower voltage because they are older and newer plants generate at higher voltages because of newer technology really doesn't make a difference because they all must amtch a grid voltage if supplying power into a grid by use if step-up transformers that would match a common voltage.
 
most of the plants here generate power at 13.8kV. the voltage vary at the transmission level where the voltage is stepped up to the nearest substation voltage which is normally 115kV
 
Power Generation

All of the generators I've dealt with 50MW to 100MW were producing at 13.8KV but what went to the grid depended on where the Sub-Station tie in was. The attached links show governing documents from local power authority to Independent Power Producers (and origin) which may shed some light. I imagine your local authority may have something similar available for you to flip through. Hope it helps.
http://www.lipower.org/pdfs/company/papers/LIPATransmission.pdf
http://www.lipower.org/company/papers/interconnect.html

Keith
 
We have older generators operating at 6.9 kv and stepped up to either 34.5kv, 69kv, or 115kv. Some of the newer and bigger plants around step up to 230kv or 345. It then is taken to substations via transmission line ad stepped back down to distribute. This is just our local area and i'm sure others have different circumstances.
 
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