Sensitivity of price to changes in load

Report notes

1. The data presented in this report is sourced from PRSS SPD case files and the Authority’s vSPD model. Every 30 minutes, the most recent PRSS case is used as the base case in a sequence of experiments using vSPD. The experiments entail incrementing and decrementing load at conforming nodes by a small percentage ranging from +/- 0.5% to +/-5%. The resulting market prices are collected and presented in this report at nine key nodes. The short (4 hours) price response schedule is used for this analysis because it is PRSS prices that frequently become dispatch prices, when real-time prices are unavailable.

2. Conforming nodes are those locations where load conforms to a predictable or forecastable pattern. The non-conforming nodes that are excluded from the load perturbation experiments are: ASB0661, EDG0331, GLN0331, KAW0111, KAW0112, KAW0113, KIN0111, KIN0112, KIN0113, TNG0111, TWI2201, and WHI0111.

3. The report updates every 30 minutes between the hours of 6am and 6pm and will show prices up to about seven trading periods into the future.

4. In addition to the base case, eight of the 14 experiments are shown on the report by default. Additional and/or different experiments can be dialled up using the ‘Series filter’ parameter.