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50 GRFs are a promising option for airports seeking to improve their sustainability performance. The FAA has reviewed the GRF approach described in this report and finds that there are no regulations that would prevent an airport pursuing a GRF. While many of the traditional federal government grants cannot be used directly as seed funding, GRFs can be started without any new sources of capital using savings generated from already installed efficiency projects. Although airlines and other airport stakeholders may be unfamiliar with the GRF approach, airports can work with these stakeholders to explain how a GRF works and collaboÂ rate on fund implementation. AirportÂsponsored GRFs may only make sense for larger airports that spend at least $1 milÂ lion annually on utilities. However, the VARF offers an alternative state model that could enable multiple smaller airports to participate without requiring the full implementation responsibilities. This could expand GRF adoption on a statewide basis to GA airports. For airport early adopters, GRFs are a wellÂestablished method for generating new sustainÂ ability funding that has been tested and refined in higher education and municipalities. IndiÂ vidual champions must be willing to navigate in some level of uncertainty to advance GRFs at their airports and unlock this new financing mechanism. C H A P T E R 6 Conclusions