By Antonio Enas, Chris Kimmett, and Jack Joyce Inertia Monitoring on Renewable Energy Grids Quantifying modern grid stability challenges for systems with high inverter-based resource penetration using new digital technology. W ITH THE WORLD RACING TO EMBRACE renewable energy sources to get to net-zero carbon, two challenges are becoming apparent-ensuring that grids have enough system strength and that grids making the transition to renewables have adequate levels of inertia. In this article, we are going to talk about the Digital Object Identifier 10.1109/MELE.2022.3187883 Date of current version: 2 September 2022 problem of inertia for grids that are transitioning to renewable energy sources. When it comes to inertia, the equation is simple-if there isn't enough inertia, then there is an increased risk of power blackouts and system instability. Up until now, stable inertia has been provided by synchronous generators, which are fueled by fossil energy sources. When it comes to renewables, the picture is different. Renewables do not have a lot of naturally occurring ©DENNIS SCHROEDER/NREL 2325-5897/22©2022IEEE IEEE Electrification Magazine / SEPTEMBER 2022 azine / 55