Springer Nature has institutional agreements for Open Access with universities in many countries. If you are a researcher in any of the included universities it means you can publish your EMSE article open access at no charge to yourself. You can find an overview of the agreements here.
Lists of eligible universities per country (as of May 31, 2019, for current information visit Springer Open Access):
Note that only the affiliation of the corresponding author is considered. So select the corresponding author based on this if you want to publish open access in EMSE.
If you want to see examples of our openly published articles see this list.