A small-multiple area chart displays monthly energy consumption across different sites, with each panel representing a distinct location. The visualization uses D3.js v4 to load data from a CSV file, parse the time series, and render a separate small SVG chart for each site. The code employs d3.nest() to group data by site, d3.line() for path generation, and d3.scaleOrdinal() for color encoding, with axes rendered per chart.