With this release, the Flexible Distribution Grid Demonstrator (FLEDGE) was renamed to Multi-Energy System Modeling and Optimization (MESMO). New features Added new optimization problem object (utils.OptimizationProblem) as main interface for defining optimization problems with functionality to 1) export the standard form for LP / QP, 2) directly interface Gurobi for better performance with large problems. Overhead line types can now be defined in terms of conductor data and geometric arrangement (Arif Ahmed). Added local-approximation variant for linear electric grid model. Added linear model set for electric grid model, which enables defining separate linear models for each time step. Added power flow solution set, to obtain power flow solutions more conveniently for multiple time steps. Added pre-solve method for DER model set, to obtain baseline nominal power time series for flexible DERs. Changes Improved / simplified define_optimization...() methods for most use cases. Revised define_optimization...() methods for new optimization problem object. Switched from multiprocess to ray for parallel processing for performance reasons. Revised documentation structure, overhauled the architecture documentation and added the configuration reference.