It has to be noted that any estimate of investment needs is affected by considerable uncertainties regarding the density of future slow- and fast-charging infrastructure, vehicle demand and technology developments (e.g. battery power).
Opozoriti je treba, da na vsako oceno potreb po naložbah vplivajo znatne negotovosti glede gostote prihodnje infrastrukture za počasno in hitro polnjenje, povpraševanja po vozilih in razvoja tehnologije (npr. akumulatorjev).