Tigard Microgrid Feasibility Study

The information presented in this report was collected through interviews with significant stakeholders from the City of Tigard, Portland General Electric (PGE), real estate developers, business owners, and specialists from the Energy Trust of Oregon (ETO). The University of Oregon, in partnership with the City of Tigard, has synthesized this information to build a feasibility study for the deployment of solar microgrids in the city. This project seeks to answer the fundamental question: How can Tigard deploy microgrids using distributed renewable energy generation and battery storage at both the building and district scale to provide equity, resiliency, economic, and sustainability benefits to the public, local businesses, the city, and the utility company and its grid? Across the world, renewable resources are being deployed at ever increasing rates to replace fossil fuel generation sources in the race to achieve net‐zero carbon emissions. This adoption has been encouraged in the United States by a rapid decrease in technology costs and favorable policies at the federal and state levels. Solar power’s low cost, limited maintenance demands, and infinitely renewable energy source make it a perfect solution for building resilience in preparation for emergencies. Tigard and the rest of the Pacific Northwest are under the constant threat of wildfires and face the possibility of a massive Cascadia earthquake, which was famously reported on by The New Yorker magazine in 2015 (1). To prepare for this possibility, Tigard is exploring the case for creating a single user microgrid (SUM) that would provide energy to the public library, which will serve as the emergency operations center in times of need. In an effort to achieve Tigard’s sustainability objectives and transform the city into a clean energy leader in Oregon, the team is also exploring the expansion of this microgrid to include the Hunziker Core, a light industrial and manufacturing district located just north of the library. The core is dominated by warehouses and large commercial buildings with vast surface parking lots that provide opportunity for rooftop and ground mounted canopy solar. The district scale application of microgrid technology creates benefits for the grid, the utility, the owner of the generating assets, the City, and local businesses, particularly those that value resilient power. This multi‐user microgrid (MUM) is, however, the most complex system to fund and manage because of the potential number of generating facilities, owners, and user profiles. The implementation of the district scale MUM could be facilitated by the City’s enthusiastic endorsement and extensive cooperation from the utility, PGE.