EMO:Getting Good Data

When solving EMO to reproduce the market solves, or to look at what-ifs, it is essential that you have good data feeds into EMO. The following are our recommendations, and tips.

When comparing the market to EMO solves, always keep in mind that there are differences between what actually happened in the market and what EMO solves.

This arises for three main reasons:

1. Dispatch is based on forecast demand whereas SPD solves used metered half hourly demand.
2. Frequency keeping stations operate within their respective frequency keeping bands and not at exactly their dispatched MW values.
3. The large hydro systems are generally allowed to block dispatch, under which they are given their station dispatches but they can change individual station outputs as long as the total system output equals the total MW dispatch for the block. As a results, you will often see one station in a block up and one down by the same amount relative to the dispatch given by EMO.

The above is based on the assumption that you set EMO up to access actual generation data (from SCADA on em6) from your database for use in Market View mode. You could also choose to extract generator dispatch from the daily SPD data files available on the EA web site, in which case the agreement between EMO and the SPD generation data will be much better.

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