This example presents renewable energy production trends across 150 days using two linked SVG charts. The first chart displays three multi-series line charts for solar, wind, and hydro energy using d3.line and d3.scaleOrdinal. The second chart combines a bar chart for solar energy with an overlaid line chart for wind energy, using d3.csv to load the energy_data.csv dataset. Both charts share axes and legends, with the bar-plus-line combination highlighting the relationship between solar and wind output over time.