EML-CTS—Adaptable Open Source Transactive Energy—Architecture and Implementation

We describe EML-CTS, new open source software from The Energy Mashup Lab. EML-CTS is an adaptable open source implementation of the Common Transactive Services (CTS), which were initially described in the NIST Transactive Energy Challenge in 2016. The evolved specification for CTS [1] will be submitted for standardization in 2020.We describe how we isolate volatility and support alternate market designs and market rules, while enabling systems and nodes to be built for today’s and tomorrow’s markets.The Java source code and documentation for EML-CTS is freely available on Github1, and is licensed under the Apache 2.0 License for simple inclusion in commercial and research projects.Users of the specification and the project include commercial energy system vendors, researchers in energy markets, and building systems including those using ISO 17800 (FSGIM) and IEC 62746-10-1 (OpenADR 2.0), IEC 62325, and other markets and standards capable of interacting using CTS.We include historical background, describe the project from logical and implementation perspectives, and discuss decisions made. We describe the standards-based interactions and conclude with work in progress.