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Enron Mail |
Hi Karolina,
Yes, it might be more productive to talk on the phone. Given our time difference, why don't we plan on tomorrow (Friday) 8:00AM PDT, 4:00PM BDT? My number in the states is 503-464-8430. Give me your number, too, so that I can call back if I get hung up in a meeting or something. The situation is complicated by the fact that the marginal cost is set by the capacity increment of a plant that is on the margin in a particular hour, but in constructing the stack, increments of a plant may be scattered throughout the stack, based on their respective incremental heat rates. (This is why increment heat rates must be strictly increasing in this model.) Results for the capacity increments, however, are not available as output; only each plant's aggregate values are reported. I had to construct the stack for a particular hour to answer question about a Homer City, NY plant we were studying a few years ago. Attached is the SQL query you can import into MS ACCESS to do the same thing for you (making appropriate modifications to the year, hour, etc.) Unfortunately, no Henwood documentation on the output variables existed when I created this query, so I can not really tell you what they represent anymore. An acquaintance of mine at Entergy and I were lobbying to get Henwood to provide some documentation, so it may be available now. Let's talk and maybe we can help you out, Michael <<< Karolina Potter/LON/ECT@ENRON 08/24/00 07:08AM <<< Michael, I am an analyst in Paul Mead's Continental Power Trading group in London. I am currently working on the project, which requires the use of EMSS, and experience some difficulties interpreting the output results. Steven Leppard from our research group gave me your name as an expert in this system and consequently the person to contact in case of problems. I have been running simulations for the Dutch market and was asked to provide the traders with some front-end screen graphs in order to interpret the numerical results. One of the graphs is to show an hourly generation stack and system's marginal cost, as we only run cost based scenarios. To sort each station's hourly generation I need its marginal cost. To my knowledge though, marginal cost is only generated for a systems marginal unit (TransArea Marginal Units query, Marg_cost unit). Therefore I was sorting the stations according to the cost which I calculated based on the outputs from Station Detail by Hour query. The calculation was as follows: For each hour, for each generating station: "marginal cost" [o/MWh] = (Generation_Cost [o000] * 1000)/Generation [MWh] - VOM_cost [o/MWh] This I thought would include fuel cost and start up costs. However, a marginal station which I get on the stack as a result of the above calculation is not a station given in Marginal Station field in TransArea Marginal Units query. I have also looked into TransArea_Data_Hr table and TransArea_Data table but non of the costs there match my results. Do you happen to know what formula is used to determine Marg_cost and which outputs I should be using to obtain the right results? It might be easier if we could discuss this issue on the phone. In this case could you please send me your direct telephone number. I am struggling understanding what is going on and would appreciate your help very much. Regards Karolina
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