Grass-based biomass from grasslands can be used as feedstock in green biorefineries (GBs) that produce a range of bio-products. In addition, adjustments made as part of crop rotation to increase areas under temporary grasslands can yield benefits such as carbon sequestration, increased soil productivity, reduced eutrophication, and reduced need for pesticides. A flexible modeling framework is developed to analyze the deployment options for GBs that use grass-clover to produce protein feed and feedstock for bioenergy. The focus was on optimal deployment, considering system configuration and operation, as well as land use changes designed to increase grass-clover cultivation on cropland. A case study involving 17 counties in Sweden showed that deployment of GB systems could support biomethane and protein feed production corresponding to 5%–60% and 13%–154%, respectively, of biomethane and soybean feed imports to Sweden in Year 2020. This article is protected by copyright. All rights reserved.