This document is a technical report detailing the capabilities of CMG STARS, a fully integrated reservoir simulator designed for geothermal applications. It outlines the simulator's features, including its ability to model complex geothermal systems by integrating reservoir, wellbore, fractures, geomechanics, and geochemistry into a single platform. The report emphasizes the thermal accuracy provided by advanced heat transfer methods, such as conduction and convection, and its capacity to handle multiphase and multicomponent fluid behaviors. Additionally, it presents case studies demonstrating the simulator's effectiveness in predicting production temperatures and optimizing energy recovery in various geothermal projects. The report also addresses critical questions regarding sustainable heat production and the impact of surface constraints on deliverability, highlighting the simulator's role in enhancing design confidence and reducing costs in geothermal energy projects.