Pacific Northwest National Laboratory team is developing a sustainable data evolution technology (SDET) tool to create open-access power grid datasets and facilitate updates to these datasets by the community. The lack of open-access, realistic datasets significantly limits the ability of researchers, developers and ultimately end users to develop, benchmark and compare new methods and tools for optimizing the operation and planning of the grid, which leads to slow adoption by end users. The SDET technology will deliver large-scale realistic datasets and data tooling methods capable of generating new datasets. Along with a separate Data Repository for Power system Open models With Evolving Resources (DR POWER), which aims to deliver a repository that manages datasets through a web portal, we are proposing a complete package for evolvable power grid datasets. The objective is to make this a long lasting effort within and beyond the ARPA-E program so that the datasets can evolve over time and meet the needs for the current and future power grids.