Continuous point on wave data recorded by a sensor sited in a wall outlet in Oakland. Measurements were recorded between 8pm on May 11, 2021 and 8pm on May 12, 2021 (Pacific time) during routine testing of the Cheif Joseph Braking Resistor, located in Eastern Washington.
According to BPA the purpose of the resistor "is to aid in the absorption of excess electrical energy produced by the [Chief Joseph] hydro project. It consists of three towers, one per each generating phase, each supporting a giant mass of wire conductor. When in use, the braking resistor emits a glow from the wire conductors, which is why it has the nickname of the toaster." (https://www.instagram.com/p/BIsyyQEAG5c/)