Line chart with 3 axis?

Hi mueller_82，

There is only one Y axis on the basic line chart in Power BI Desktop, an idea about this issue has been submitted in this link, please vote it up. In your scenario, you would need to create R visual which is introduced in the following link if you want to have a second Y axis on the basic line chart.

http://robjhyndman.com/hyndsight/r-graph-with-two-y-axes/

Alternatively, you can create combo chart(Line and clustered column chart or Line and stacked column chart) which has secondary Y axis following the guide in this article: https://powerbi.microsoft.com/en-us/documentation/powerbi-service-tutorial-combo-chart-merge-visualizations/ .

Thanks,
Lydia Zhang