Consultation on RIIO-T3 Strategic Investment

1. Please provide your views on our base space assumption for spare bays.

Do you think it’s sufficient? Are there any other factors we should consider?

2. Please provide your views on our approach to bus couplers and bus sections.

Do you think we are right to consider options 2 and 3 according to the individual needs of each substation? Are there any other factors we should consider?

3. Please provide your views on our approach to replacing 60MVA Grid Transformers.

Do you think we are right to provide the increased capacity offered by 90MVA units even if there is no specific driver currently anticipated by the energy scenarios?

4. In the absence of a specific driver for capacity increase, we will provide meaningful incremental capacity for a modest cost increase. Please give us your views on this strategy.

For example - replace lynx conductor with sycamore rather than poplar. We do not propose to provide the increased capacity offered by upas conductor at 132kV due to the much lower cost/benefit ratio.