The location-specific trade-off in relative costs and life cycle GHG emissions between photovoltaic and grid-tied power was driven by the unit cost and GHG intensity of the local grid electricity. Thus, the NEWgenerator was simulated across a wide range of unit grid electricity costs (0.0-0.6 USD•kWh -1 ) and grid GHG emissions (0-1 kg CO2eq•kWh -1 ). These ranges capture the lowest to highest unit grid electricity costs 43 and emissions 44 based on datasets from across the globe and can inform discussion about the implications of local electricity sources on the relative sustainability of the photovoltaic versus grid-tied NEWgenerator. Rest of world or global emission factors were used across the contextual analysis for consistency due to data insufficiencies regarding location-specific manufacturing of components and consumables (e.g., photovoltaic panels, NaCl).