1 CASE STUDY Pulling data together for a power exchange When Ameren Services Company became a member of the Midwest Independent Systems Operator (MISO) in 2005, its business changed significantly. (Ameren entities joined MISO at various times. The key date was the start of the Energy Market on April 1, 2005). Instead of selling energy directly, (Ameren still buys and sells energy with counterparties, although this was reduced wit

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