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Tim Smyth's avatar

A couple of interesting factoids. Some states have both RTO and non RTO regions. North Carolina is mostly non RTO but has a small portion served by Dominion(Virginia) in the North East part of the state that is in PJM. Same for Tennessee, Kentucky, Texas, and of all places California. The parts of TN, KY, and TX that are either in RTO's(or not in the case of El Paso, TX) are fairly small and insignificant. On the other hand the non RTO areas of California include places like the City of Los Angeles, Burbank, Glendale, and Pasadena along with much of the Sacramento area.

Perhaps most important significant difference is among states that have fully bundled/vertically integrated service within an RTO like Virginia and West Virginia and states that have fully deregulated so called open access regimes where there is no regulated generation. This gets a bit more complex keeping in mind that even in say Massachusetts there are still several dozen muni utilities that have fully bundled service and own/contract for generation on a long term basis. California in the CAISO/IOU utilities doesn't quite fit into either category. CA has limited utility owned generation i.e. Diablo Canyon and the hydro fleet. There are also a number of IOU owned gas plants that operate on a full cost of service basis with guaranteed gas transportation etc.

**PJM in particular has a capacity market "opt-out" regime that Virginia, North Carolina, West Virginia, Kentucky, Indiana, Michigan, and Tennessee all use for the parts of there respective states in PJM that are all traditionally regulated.

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Meredith Angwin's avatar

Hi Tom. Thank you for this post!

Minor quibble. You are correct to list Texas as an RTO state (ERCOT). However, on the map, you show it as mostly non-RTO. There are non-RTO areas within Texas...mostly municipal utilities. But most of Texas is ERCOT.

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