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"""
Iowa's Renewable Energy Boom
----------------------------
This example is a fully developed stacked chart using the sample dataset of Iowa's electricity sources.
"""
# category: case studies
import altair as alt
from vega_datasets import data
source = data.iowa_electricity()
alt.Chart(
source,
title=alt.Title(
"Iowa's green energy boom",
subtitle="A growing share of the state's energy has come from renewable sources"
)
).mark_area().encode(
alt.X("year:T").title("Year"),
alt.Y("net_generation:Q")
.title("Share of net generation")
.stack("normalize")
.axis(format=".0%"),
alt.Color("source:N").title("Electricity source")
)
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