Ann: Redflow Quarterly Update Q4 FY2021 and Appendix 4C, page-28

When prices fluctuate on the grid by 2x, a person with 90% RTE makes a 80% profit each cycle, while someone with a 80% RTE makes a 60% profit. In a competitive grid, those differences mean the high RTE system will cut in earlier, and smooth the peaks making the difference even bigger. it gets worse as the grid stabilises better. When prices fluctuate by 1.25x, the 90% RTE makes 12.5% per cycle while the 80% RTE makes nothing. Lose half your batteries to fire, and you’re still better off with 90% RTE - you just halve your profit.
if you’re building a big battery to stabilise the grid, and you expect to use it for 10 years or more, you’re going to pay a premium for high RTE. its an uphill battle if you’re both more expensive and lower RTE.
At the moment, Lithium wins for FCAS as terribletadpole points out; when there’s a lot of storage on the grid, lithium wins for RTE; and then there’s a period in the middle where RFX has a market. How long is that? When will it start?