In the face of growing global demand for electricity and intensifying pressure to curtail greenhouse gas (GHG) emissions, the development of renewable energy resources is on the rise worldwide. As countries with mature power sectors shift toward a more renewables-heavy generation mix and those with emerging power sectors build out their grids to accommodate new renewable capacity, demand for transmission system technologies required to integrate renewables is also increasing. The nature of transmission system extensions triggered by new renewable energy capacity will vary based on a series of factors, including generation type (e.g., wind, offshore wind, or solar), plant size, and distance from the grid. These extensions will also vary based on the regulatory framework governing the development of new transmission lines within a given region. The variability of renewable generation creates challenges for grid networks designed to absorb the steady output of conventional fossil-fuel generation, raising the need for additional solutions to ensure grid stability and reliability. According to Navigant Research, global spending on transmission system infrastructure for renewable energy integration is expected to grow from $36.7 billion in 2016 to $46.7 billion in 2025. This Navigant Research report examines the market for transmission system technologies required to integrate large-scale renewable energy generation. The primary technology segments analyzed are high-voltage alternating current (HVAC) transmission systems, high-voltage direct current (HVDC) transmission systems, and utility-scale energy storage systems (ESSs). These segments are further examined by equipment subcategory. HVAC equipment subcategories include substations, transmission lines, and flexible alternating current transmission systems (FACTS). HVDC equipment subcategories include converter stations and transmission lines. Global market forecasts of renewable energy capacity additions and revenue extend through 2025 and are also presented by region and generation type.