Hi and thank you for this question. While the DER-VET GUI can only handle single-year LMP data, the DER-VET command-line version allows for multi-year input of LMPs. The _Scenario_ input parameter _opt___years_ can be set to a list of years. For example, to run DER-VET for a specific 3-year period (2017 through 2019), in the Model Parameters CSV file, edit _opt___years_ to be '2017 2018 2019'. Please note the format: there has to be a space between each year. In addition, if the time-step is hourly, the corresponding time series data must have 8760 * 3 = 26,280 entries.