Over the past few years, we’ve been covering the U.K.’s novel approach to enlisting rooftop solar, behind the meter batteries, electric vehicle chargers and grid-responsive appliances as an integral part of their power grids. This nationwide “electricity system flexibility” effort has set a series of tasks before the country’s six distribution network operators (DNOs). First, they’ve built up the technology to monitor and manage these distributed energy resources (DERs) at large scale.