Joint Feasibility Study

1. Why is it that there is no wind generation in the mix for 15% CPRS scenario which is unrealistic?

2. There are two simulation techniques listed. It looks like there could be a need to examine both if BigB investment decisions are made.

3. Market scenario titles are not reflecting what it means to capture. Though it has captured different scenarios, the titles should be simple and straightforward.

4. Why are system normal constraints in Yorke peninsula not addressed but only in Eyre is addressed because there is no capacity for any generation to connect.

5. There is a 500 kV connection proposed from HYTS to Krongart which should have been extended all the way till Tepko. Though this is just a feasibility study but power system dynamics and economics must be reviewed to determine if a double circuit twin conductor 275 kV line is still a better option than a quad conductor 500 kV single circuit?

6. 500 kV AC transmission from Wilmington to Mt Piper may not work unless it is a pure radial injection into NSW. This simply means a power control device may still be needed near Davenport if not there could be overloads on 275 kV lines from Davenport to Adelaide but this depends on OD demand and NPS as well.

7. A quad conductor 500 kV double circuit line (four conductors in each phase and and in both lines) AND with series compensation on both the lines can do better than 2000 MW based on steady state stability limits since this undercuts thermal limits.

8. Why does not the northern AC connection from Wilmington to Mt Piper traverse via Broken Hill? There is a huge wind farm near Broken Hill proposed and there is solar potential as well.

9. Northern AC or HVDC connection to Mt Piper will not work unless TG completes the 500 kV ring - which is a 500 kV line from Liddell/Bayswater to Tomago/Newcastle and from Bannaby to Sydney in the south. This is due to "potential" system normal constraints on Liddell/Bayswater to Tomago/Newcastle 330 kV lines. The east is existing and west part of the ring is probably complete.

10. On an other issue but somewhat related to this is ElectraNet and AEMO should publish a report following the current review which is examining the higher VIC-SA transfer limit irrespective of whether it is 460 +220 or 460 + 180 MW.

11. 500 kV line proposal from Yass/Bannaby to Tepko is good but how will geothermal generation in Innamincka will be evacuated? But this will depend on OD demand as well.

12. Mt Isa and Western Downs should be considered for NTP but it is a bit far for this study.

I hope these comments will be considered. Thanks for providing an opportunity to provide comments.