The dataset stored at https://powerdata-explore.lbl.gov is a set of power measure- ments and annotations, and an interface for exploring and downloading that data. The power measurements are collected by micro-phasor measurement units (μPMUs) [Powa, VMCMA14] and PQube3 power quality meters [Powb] manufactured by Power Standards Laboratory in Alameda, CA and located at Lawrence Berkeley National Laboratory, as well as other sites. This white paper describes the datasets, how to view and download the data and associated metadata.