Hi Jay,
I just re-read your first message, and see that you say "...unchecking 'net metering' on the rate page blacks out the hourly sell rate in the energy rate section." Could you double-check that? When Enable net metering is checked, the all of the sell rate inputs are disabled. But when the checkbox is not checked, the sell rate inputs should be enabled. Note that all of the Energy Charge inputs (buy rates and sell rates) are disabled when Enable time-of-use and/or tiered energy rates is not checked.
I think the only limitation in SAM that prevents it from not modeling the Nebraska net metering law is that SAM does not provide an input for a rate to apply to the monthly net excess generation, which the law stipulates be "compensated at the local distribution utility's avoided cost of electric supply over the billing period."
With net metering disabled, SAM does not compensate for net monthly excess generation. Instead, for time steps when the load is greater than the system's output, it applies the buy rate to purchase electricity, and for time steps when the load is less than the system's output it applies the sell rate to excess electricity in that time step.
Best regards,
Paul.