This bar chart displays natural gas consumption by the electric power sector across eleven U.S. states, with each bar’s length encoding the consumption value in billion BTU. A sequential color scale using `d3.scaleSequential` and `d3.interpolatePuRd` maps higher consumption to darker hues, with a `d3.legendColor` legend clarifying the gradient. The chart is rendered as SVG using D3 v7, with axes created via `d3.axisBottom` and `d3.axisLeft`, and data loaded from a CSV file.