Renewable energy skeptics argue that because of their variability, wind and solar cannot be the foundation of a dependable electricity grid. But the expansion of renewables and new methods of energy management and storage can lead to a grid that is reliable and clean.
As wind and solar power have become dramatically cheaper, and their share of electricity generation grows, skeptics of these technologies are propagating several myths about renewable energy and the electrical grid. The myths boil down to this: Relying on renewable sources of energy will make the electricity supply undependable.
In Europe, the usual target is Germany, in part because of its Energiewende (energy transformation) policies shifting from fossil fuels and nuclear energy to efficient use and renewables. The newly elected German government plans to accelerate the former and complete the latter, but some critics have warned that Germany is running "up against the limits of renewables."
The United States, where renewable energy and nuclear power each provide roughly 20 percent of electricity, had five times Germany''s outage rate — 1.28 hours in 2020. Since 2006, Germany''s renewable share of electricity generation has nearly quadrupled, while its power outage rate was nearly halved. Similarly, the Texas grid became more stable as its wind capacity sextupled from 2007 to 2020. Today, Texas generates more wind power — about a fifth of its total electricity — than any other state in the U.S.
In Japan, following the multiple reactor meltdowns at Fukushima, more than 40 nuclear reactors closed permanently or indefinitely without materially raising fossil-fueled generation or greenhouse gas emissions; electricity savings and renewable energy offset virtually the whole loss, despite policies that suppressed renewables.
While variable output is a challenge, it is neither new nor especially hard to manage. No kind of power plant runs 24/7, 365 days a year, and operating a grid always involves managing variability of demand at all times. Even with no solar and wind power (which tend to work dependably at different times and seasons, making shortfalls less likely), all electricity supply varies.
Climate- and weather-related factors have caused multiple nuclear plant interruptions, which have become seven times more frequent in the past decade. Even normally steady nuclear output can fail abruptly and lastingly, as in Japan after the Fukushima disaster, or in the northeastern U.S. after the 2003 regional blackout, which triggered abrupt shutdowns that caused nine reactors to produce almost no power for several days and take nearly two weeks to return to full output.
Thus all sources of power will be unavailable sometime or other. Managing a grid has to deal with that reality, just as much as with fluctuating demand. The influx of larger amounts of renewable energy does not change that reality, even if the ways they deal with variability and uncertainty are changing. Modern grid operators emphasize diversity and flexibility rather than nominally steady but less flexible "baseload" generation sources. Diversified renewable portfolios don''t fail as massively, lastingly, or unpredictably as big thermal power stations.
Most discussions of renewables focus on batteries and other electric storage technologies to mitigate variability. This is not surprising because batteries are rapidly becoming cheaper and widely deployed. At the same time, new storage technologies with diverse attributes continue to emerge; the U.S. Department of Energy Global Energy Storage Database lists 30 kinds already deployed or under construction. Meanwhile, many other and less expensive carbon-free ways exist to deal with variable renewables besides giant batteries.
The first and foremost is energy efficiency, which reduces demand, especially during periods of peak use. Buildings that are more efficient need less heating or cooling and change their temperature more slowly, so they can coast longer on their own thermal capacity and thus sustain comfort with less energy, especially during peak-load periods.
A third option for stabilizing the grid as renewable energy generation increases is diversity, both of geography and of technology — onshore wind, offshore wind, solar panels, solar thermal power, geothermal, hydropower, burning municipal or industrial or agricultural wastes. The idea is simple: If one of these sources, at one location, is not generating electricity at a given time, odds are that some others will be.
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