Solar-Energy-Systems

In early May of this year, Portugal ran on renewable electricity alone for four consecutive days. And later that same month, on May 15, Germany filled almost all its electricity needs with solar, wind, and hydro power.

This is good news: it tells us we’re making progress toward a zero-carbon energy system. But it also helps us see the challenges to a full renewable energy transition.
Many press reports said Portugal and Germany were getting all their energy from renewables during these short periods of abundant wind and sunlight. But it’s important to remember that we’re really talking only about electricity, which currently represents about 20 percent of global final energy usage. The other 80 percent of energy usage occurs mostly in transportation, agriculture, industrial processes, and in heating buildings, and currently requires liquid, gaseous, and solid hydrocarbon fuels. We have a big challenge ahead of us in electrifying those areas of energy usage.
In Germany on May 15, power prices turned negative several times during the day: utilities were effectively paying consumers to use electricity. This points to the existential crisis that renewables pose for conventional utilities—which, after all, need to sell power to pay for their sunk costs (grid infrastructure and power plants) and for the conventional fuels they still use. What can they do when there’s just too much sun and wind? The sensible response would be to store the energy for later, but that implies still more infrastructure costs.
Figure 1: Electricity production in Germany, December 2014. Source:http://energytransition.de/files/2015/07/electricityproductionindecember…
During many days in the year Portugal and Germany face a situation opposite from the one they encountered in May: there is no wind or solar power to speak of. Then conventional coal, gas, or nuclear power plants are still needed—and will be until a time in the future when there is enough storage and redundant capacity in place to buffer the intermittent availability of sun and wind. But getting there will require both investment and a restructuring of the economics of the power industry.
As co-author David Fridley and I conclude in our book Our Renewable Future, the renewable energy transition will not consist of a simple process of unplugging coal plants and plugging in solar panels or wind turbines; it will imply changes in how we live, how much energy we use, and when we use it. Historic energy transitions (the harnessing of fire, the advent of agriculture, the fossil fuel revolution) changed societies from the bottom up and from the inside out. There’s no reason to assume the renewable energy revolution will be any less transformative.

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Richard Heinberg is the author of thirteen books including:
– Our Renewable Future: Laying  the Path for One Hundred Percent Clean Energy, co-authored with David Fridley (2016)
– Afterburn (2015)
Snake Oil (July 2013)
The End of Growth (August 2011)
– The Post Carbon Reader (2010) (editor)
Blackout: Coal, Climate, and the Last Energy Crisis (2009)
Peak Everything: Waking Up to the Century of Declines (2007)
The Oil Depletion Protocol: A Plan to Avert Oil Wars, Terrorism & Economic Collapse (2006)
Powerdown: Options & Actions for a Post-Carbon World (2004)
The Party’s Over: Oil, War & the Fate of Industrial Societies (2003)
He is Senior Fellow of the Post Carbon Institute and is regarded as one of the world’s foremost advocates for a shift away from our current reliance on fossil fuels. He has authored scores of essays and articles that have appeared in such journals as Nature Journal, Reuters, Wall Street Journal, The American Prospect, Public Policy Research, Quarterly Review, Yes!, and The Sun; and on web sites such as Resilience.org, TheOilDrum.com, Alternet.org, ProjectCensored.com, and Counterpunch.com.
Richard has delivered hundreds of lectures on energy and climate issues to audiences in 14 countries, addressing policy makers at many levels, from local City Councils to members of the European Parliament. He has been quoted and interviewed countless times for print (including for Reuters, theAssociated Press, and Time Magazine), television (including Good Morning America, Canadian Broadcasting Corporation, Australian Broadcasting Corporation, Al-Jazeera, and C-SPAN), and radio (including NPR, WABC, and Air America).
Richard has appeared in many film and television documentaries, including Leonardo DiCaprio’s 11th Hour. He is a recipient of the M. King Hubbert Award for Excellence in Energy Education, and in 2012 was appointed to His Majesty the King of Bhutan’s International Expert Working Group for the New Development Paradigm initiative.
Richard’s animations Don’t Worry, Drive On, Who Killed Economic Growth?  and 300 Years of Fossil Fuels in 300 Seconds (winner of a YouTubes’s/DoGooder Video of the Year Award) have been viewed by nearly two million people.
Originally published by Island Press

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