Brussels / 3 & 4 February 2024



The open source OCPP 2.0.1 CSMS project CitrineOS was initiated by S44. By leveraging over a decade of experience in EV charging software, at S44 we are actively working towards making EV charging more attainable and equitable. In our quest for a greener future, we face a pivotal challenge: by 2030 50% of new U.S. cars will be EVs, but today 28% of chargers in leading cities don't work. Developers must build innovative software to improve and grow the charging network so EV owners can travel with confidence. By creating an open source charge station management system, CitrineOS's goal is to provide the fuel for this change. The project is NEVI compliant, globally available and open to all. CitrineOS is meant to offer a community driven, reliable CSMS that builds a foundation for market participants to innovate on top of a protocol implementation instead of re-inventing the same wheel. The project drives forward the adoption of the OCPP 2.0.1 protocol resulting in more reliable charging networks worldwide. Our hope is that anyone looking to bootstrap a modern charging network, or upgrade an existing one from OCPP 1.6 to OCPP 2.0.1, will consider CitrineOS as their starting point, and that increased community involvement will continue to improve the charging experience delivered by this open source project. Our main code repository can be found here on GitHub: take a look at our GitHub pages site that you can find here:


Photo of Christian Weissmann Christian Weissmann