Integrating Southwest Power Pool Wind to Southeast Electricity ...

Table 5-10 shows the difference in generation between scenarios #3 and #2. As shown earlier,
coal output from across the footprint increases significantly displacing primarily TVA and SBA
CC output. This occurs because the lower reserve requirement across the footprint results in
less need for CCs to be online and spinning and because the other SERC regions not assigned
wind (SERC West and SERC East) can now also provide reserve to balance the intra hour
variability of the wind from their cheapest generation.
Entergy’s generation contribution does not change significantly, but TVA and SBA decrease
generation corresponding to their CC decrease being greater than coal increase. SPP increases
generation due to its coal, while coal increases also account for an increase in other Western and
Eastern SERC regions. The net effect of this is a decrease in production costs of approximately
$0.7/MWh.
Figure 5-10 shows the net effect of the changes in Scenario 2 vs. Scenario 1. Entergy stays much
the same, while SPP and the SERC East and SERC West regions with no wind assigned increase
and TVA and SBA decrease generation. This results in the total cost reduction, as the cheaper
coal generation from across the footprint can be used instead of CCs in TVA and SBA.
Figure 5-10: Net effect of Scenario 3 vs. Scenario 2 - blue indicates increase in generation
Figures Figure 5-11 and Figure 5-12 show the aggregate footprint wide generation stack dispatch
for a selected week in April for Scenarios 2 and 3. This week was picked as it had high wind
variability and relatively low load, and therefore should show times when the benefits of closer
coordination can be seen.
5-17