Case #2 - Constrained

E

A

B

C

D

Solitude

Alta

Park City

Brighton

600 MW

$10/MWh

110 MW

$14/MWh

100 MW

$15/MWh

520 MW

$30/MWh

200 MW

$30/MWh

300 MW

300 MW

300 MW

Dispatched

at 600 MW

Dispatched

100 MW

Dispatched

at 110 MW

Dispatch Solution Ignoring Thermal Limit

Dispatched

90 MW

Total Dispatched

900 MW

253

174

216

384

84

348

Sundance

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• When we dispatch the system for this increased load, ignoring the thermal limit, we have the following results:
  • Brighton is dispatched at 600 MW.
  • Alta is the next least expensive unit, so we dispatch it for its full capacity at 110 MW.
  • Park City is then dispatched at 100 MW. We still have 90 MW of load to serve, so we dispatch Sundance at 90 MW.
  • We have now served our 900 MW load.
  • But we see that with these withdraws and injections, we have a violation, which is not acceptable.

• We need to re-dispatch our system to meet this load and not violate the thermal limit.