I have learned a bit more about the FERC website.
If you go to: http://www.ferc.gov/docs-filing-/eqr/data/spreadsheet.asp you get a webpage that has quarterly/monthly (?) data on power sales by all of the large power plants in the USA, for the past ten years or so. All large power producers are required to report this information to FERC, and it is public.
After selecting a producer (see below), click on "download" and you get a monthly summary sheet. On this sheet, power produced and sold is listed in rounded thousands of Megawatt hours (Gigawatt hours) of actual powe. Also there is some "Capacity" which I think means contracted commitment to supply power on demand for grid balancing purposes. I think wind farms sell very little 'capacity" power, whereas fuel-burning producers can commit their full potential (if operating in spinning mode), and they get paid something for that.
Also, on the home page to the left just below "spreadsheets" you can click on "quarterly" and get three-month summaries. The quarterly information is filed about 2.5 months after the end of each quarter.
The quarterly list is huge, from all over the country. For the quarterly list, if you select a producer in the left-hand panel and wait a bit, the page suddenly jumps to that producer at the top of the left hand panel and also shows the producer, alone, in the right-hand panel. I do not understand the terminology of this page. It has to do with contracts.
You have to know the "FERC" name for each producer. In Maine, Stetson I is FERC-named "Evergreen Wind Power V, LLC"; Mars Hill is "Evergreen Wind Power"; Oakfield is (will be) "Evergreen Wind Power II", Rollins (in Lincoln) is "Evergreen Wind Power III, LLC", Stetson II is "Stetson Wind, LLC", Kibby is "Trans Canada Maine Wind Development, LLC". If there are others, I would like to know them.
So far none of them have filed for the IV quarter of 2011, but there are scores which have filed. Vinalhaven and UMPI are too small to be required to report to FERC. When you get the spreasheet webpage and click on the drop-down thingie that lists producers, you get the while list of those that have filed for the IV quarter of 2011. It grows every day.
I have been told that it is possible on this FERC site to get details of each and every
contract - sometimes hundreds of lines of data. This has not happened to me. Watch
out for this! H. Roper