The Upper Austrian energy companies LINZ AG and Energie AG Upper Austria have set a focus on constructing a broad network of e-charging stations. In the meanwhile, there are around 29 bicycle friendly businesses along the Danube Cycle Path in Upper Austria where you can charge your e-bikes for free. Make sure that you bring your own charger!
The German brochure "41 Radrundrouten rund um den Donauradweg" ("41 cycle tours round the Danube Cycle Path") was published in 2013 where you can find additional information about the e-bike rental stores and charging stations along the river.
The brochure can be ordered at Werbegemeinschaft Donau OÖ or on this website.