October payout math CanSiamCyp is right: there is a cap on the number of TA shares available for swap in October.
He is probably right that TA share price will rise and everyone will want to swap TA for RNW.
That means a prorated: 1.0337 TA shares for 50% of your shares and $13 for the other 50%.
October Swap Math
Case one: TA shares have a $12.26 quote ($13.00/1.0337)
... you'd get $13 in TA shares or $13 in cash a payout of $13.00
Case two: TA shares have the Aug 10 close quote $13.97
... you'd get [1.0337*$13.75]=$14.44 for 50% and $13 for 50%
... an average RNW per-share payout of $13.80
... and the Aug 10 close for RWN is $13.64 which is about right
... that is $13.80 - 2x($0.07833) [lost dividends] = $13.64
Case three: TA shares in October are at the average of 12 Analyst Price Targets of $16.58
... you'd get [1.0337*$16.58]=$17.14 for 50% and $13 for 50%
... an average RNW per-share payout of $15.15
So if you believe the Analysts and TA shares will be higher in October: you wait.