The U.S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE), through its Solar Energy Technologies Office (SETO), is issuing a request for information (RFI) on technical challenges and opportunities for grid integration of solar energy systems and other inverter-based resources that include photovoltaics (PV) and energy storage facilities connected to bulk power systems, distribution systems, microgrids, and behind-the-meter systems. This RFI intends to solicit stakeholder feedback from industry, academia, research laboratories, government agencies, end-user groups, and other relevant organizations related to the cost-effective and reliable integration of solar and other variable and power-electronic based energy sources onto the electric grid. Some topic areas are specific to solar and battery energy storage, while others may be relevant to multiple variable or inverter-based resources.