PhantomNVD: But V2G totally makes sense when coupled with an aging EV (likemy 2011 Leaf) which will be 7-8bars (50-60 kms) range limited in a year or so, and would then make more sense (being WAY cheaper) becoming a V2G parked up storage space (Think Tesla Powerwall) with the potential to be used as second car when occasionally needed...
Solar/off grid/rural or just ‘squeezed’ by the electric companies changing fortunes/dry years... any of these situations increase its value, and likelihood too?
There are plenty of companies who take tired EV batteries and turn them into powerwall's. It makes no sense having a vehicle cluttering up valuable parking spaces when all you need a big white box bolted to the wall in your cupboard. It makes no sense in NZ were the financial paybacks are so small. Off grid the financial situation is different of course, be then we're talking V2G not V2-not-G.
Dams and lakes are a grid level battery. If hypothetically many buildings in NZ had PV grid tied solar with no powerwalls, then in a dry year, when the sun naturally shines more, less water is taken from the dams to generate electricity which offsets the fact that it is dry.
All I'm explaining is why V2G (and also power walls to a lesser extent) aren't as financially attractive in NZ as other places, and how we can play up the environment strengths of our power system.
We need to do something soon because the Labour-Greens have ensured (by killing future gas exploration) that we will have no Gas-peaking plants in 10 years time which combined with a steeply rising population will cause electricity demand to outstrip supply. If we don't do anything, then yes, a powerwall or V2G may be a necessity in the future, but it isn't now.