RIT, I like the idea of an EV that can be plugged in and the remaining charge of the day used for house. Although in agile that user would be exposed to the 4pm to 7pm high rate if they were on the commute home with no residential battery to discharge? Might not be enough reason to go to the expense.
It will be interesting to see how TOU tariffs evolve over time. At the moment the 'peak' charging rate seen on the agile tariff is a more creation of Octopus, rather than being due to the wholesale market. In many ways, the users of peak power are subsidizing the costs of users of power over the rest of the day as Octopus adds an addition 12p gross profit margin to the rate. It shows how much is changing and how quickly when Octopus started the tariff the peak rate often hit the 35p cap. Now I guess due to their size, a market that understands their needs better and lower overall energy costs the peak rate (without the 12p uprating) is not much more than the pre and post rates.
Cars used for a daily commute are not going to be a good choice for battery storage unless owned by a single person, but there are a lot of households with second cars or made up of retired people. Homeworking may also increase, but I've been hearing that for the last 20 years or so as the first home working project I got involved in was around 1992 and planned to use ADSL (2 x 64kbit connections) for the network connection between home and office.
