This area chart visualizes electricity consumption against population for major cities, with the data sorted by population to show a clear upward trend. The chart uses blue filled areas beneath a yellow line, with orange points providing interactive tooltips that display additional city metrics. Built with D3 v7, the visualization loads CSV data from a GitHub gist, applies data-cleaning regex operations, and uses `d3.area`, `d3.line`, and `d3.curveMonotoneX` for smooth rendering. It also features grid lines, axis labels, and SVG animation for tooltip transitions.