) for grid-tied energy configuration. Continuing to increase the number of users had diminishing reduction in cost, with a plateau in photovoltaic and grid-tied median costs of approximately 9.2 and 9.0 cents per capita per day, respectively. O&M, electricity, and direct emissions were the main sources of the NEWgenerator GHG emissions (Figure ) and scaled linearly as users increase. Thus, increasing the number of users had a negligible impact on GHG emissions per capita. If the NEWgenerator is sized for 100 users but underutilized at 50 users (half of its design capacity), the photovoltaic configuration median per capita cost and GHG emissions approximately doubled to 0.246 USD•cap -1 •d -1 and 82.3 kg CO2eq•cap -1 •yr -1 , respectively (Figure ). Ultimately, pushing the existing NEWgenerator design to the highest possible loadings (without significantly compromising treatment performance) may be an effective way to reduced costs and impacts in the near term.