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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="Iowa's renewable energy boom").mark_area().encode(
x=alt.X(
"year:T",
title="Year"
),
y=alt.Y(
"net_generation:Q",
stack="normalize",
title="Share of net generation",
axis=alt.Axis(format=".0%"),
),
color=alt.Color(
"source:N",
legend=alt.Legend(title="Electricity source"),
)
)
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