#Key take away messages <div style='position: absolute; left: 66.0px; top:127.25582677165355px; width: 828.0px; height: 358.3255118110236'> <div style=font-size:14px>The energy system is a complicated network of processes and flows</div><br> <div style=font-size:14px>Models are a useful tool to understand the energy system and formulate sound energy policies</div><br> <div style=font-size:14px>Energy models provide <b>insights for energy policies, not numbers</b></div><br> <div style=font-size:14px>Modelling tools can be categorized into top-down and bottom-up. We will look at one type of bottom-up tools: <b>optimization tools</b></div><br> </div> <div style='position: absolute; left: 678.0px; top:500.5px; width: 216.0px; height: 28.75'> <div style=font-size:14px></div><br> </div> <div style='position: absolute; left: 318.0px; top:500.5px; width: 324.0px; height: 28.75'> <div style=font-size:14px>MJ2380-2381 2020</div><br> </div> ???