Intelligent Octopus I believe control vehicles through the Smartcar API BUT although Kia is on the list theres a bit more too it than just connecting. Octopus have to set up all sorts of data in regards to the various battery pack sizes so they can work out "how much" energy they need to shove in and therefore calculate the charge windows.
The other way is through chargers but again owing to limitations on Type 2 EV charge specs there is no way for any* of them to get the SOC from the car so Octopus just have to assume everytime you plug in its at 0%. The obvious flaw in this is that it'll produce massive cheap windows all the time and not work as indended so it'll be interesting to see how this pans out with the Ohme trial. (They are relying a bit more on the end user inputting how much they want & the theory being that if it schedules a cheap window and the car doesnt actually take any charge - because its full - then the cheap window is cancelled on your bill and you pay full price for whatever else you were using.)
GE & Octopus do have a relationship of sorts and Octopus still have the capability to control inverters remotely (the Octopus R&D app connects fine and can pull through everything live and still set schedules charge discharge etc. Its not too much of a stretch to assume this would also be the case for the EV charger once released to the GE API)
*Ohme being the exception in that it can find this out via a similar method to the Smartcar API
