SOforSG (Storage Optimization for Smart Grid) is a minimal example of a linear optimization problem, dealing for dimensioning and operation of a lossless energy storage. Its goal is to minimize operational costs of the household for energy purchase. For brevity, the model is quite minimalistic. Two options are available

• Try SOforSG online, directly in the browser.
• SOforSG.mod that can be solved offline using GLPK, an open-source linear programming solver. It features more output as it is not limited in length by URL limits.

• Try StockCutting online

• MathProg online, solve (small) optimization models directly in the browser.
• Operations research with GNU Linear Programming Kit. Sottinen, Tommi (2009). ORMS1020 course notes. Department of Mathematics and Statistics, University of Vaasa, Finland.
• Modeling Language GNU MathProg Language Reference, Draft Edition, for GLPK Version 4.34, December 2008.
• GLPK for Windows hosts binaries of GLPK.