from wind and solar sources. This is
good news for clean energy advocates
who hope to see our world less reliant
on polluting fossil fuels that contribute to climate change.
Renewable power sources provide
“fuel” that is free and clean. This is
highly attractive to businesses that
generate electricity, and those that run
on electricity. Yet sources like wind
and solar are also intermittent; after
all, the wind stops blowing at times,
THE WORLD’S RENEWABLE pow- er capacity—the amount of energy that can be produced from sources comprising hy- dropower, wind, solar, bio-energy, and geothermal—has doubled
in the last decade. From 2008 to 2017,
it went from 1,060 gigawatts to 2,179
gigawatts, according to research from
the International Renewable Energy
Agency (IRENA), an intergovernmental
Over that period, world renewable
energy production has also increased,
from over 3. 7 million gigawatt hours
to almost 5. 9 million gigawatt hours.
To be clear, capacity, according to
the U.S. Department of Energy, is the
“maximum output of electricity that
a generator can produce under ideal
conditions,” whereas generation is
what actually gets produced.
In both cases, much of the growth,
according to data from IRENA, comes
How researchers are improving energy storage devices for
power generated from renewable sources like solar and wind.
Science | DOI: 10.1145/3303710 Logan Kugler
A flow battery in which energy is stored in a sodium-potassium alloy.