. . . The back-of-the-envelope calculations that follow provide a template. I cannot vouch for any of them. But our governments need to conduct full-blown studies forthwith – before they commit us to spending tens of trillions of dollars on renewable energy schemes, mandates and subsidies that could blanket continents with wind turbines, solar panels, biofuel crops and battery arrays; destroy habitats and wildlife; kill jobs, impoverish families and bankrupt economies; impair our livelihoods, living standards and liberties; and put our lives under the control of unelected, unaccountable state, federal and international rulers – without having a clue whether these supposed alternatives are remotely economical or sustainable.First, we'd need batteries or other energy storage media that would be up to the task. But talking about it makes you feel virtuous, so there is that.
Ethanol derived from corn grown on 40,000,000 acres now provides the equivalent of 10% of US gasoline – and requires billions of gallons of water, and enormous quantities of fertilizer and energy. What would it take to replace 100% of US gasoline? To replace the entire world’s motor fuels?
Solar panels on Nevada’s Nellis Air Force Base generate 15 megawatts of electricity perhaps 30% of the year from 140 acres. Arizona’s Palo Verde nuclear power plant generates 900 times more electricity, from less land, some 95% of the year. Generating Palo Verde’s output via Nellis technology would require land area ten times larger than Washington, DC – and would still provide electricity unpredictably only 30% of the time. Now run those solar numbers for the 3.5 billion megawatt-hours generated nationwide in 2016.
Modern coal or gas-fired power plants use less than 300 acres to generate 600 megawatts 95% of the time. Indiana’s 600-MW Fowler Ridge wind farm covers 50,000 acres and generates electricity about 30% of the year. Calculate the turbine and acreage requirements for 3.5 billion MWH of wind electricity.
Delving more deeply, generating 20% of US electricity with wind power would require up to 185,000 1.5-MW turbines, 19,000 miles of new transmission lines, 18 million acres, and 245 million tons of concrete, steel, copper, fiberglass and rare earths – plus fossil-fuel back-up generators for the 75-80% of the year that winds nationwide are barely blowing and the turbines are not producing electricity.
Energy analyst David Wells has calculated that replacing 160,000 teraWatt-hours of total global energy consumption with wind would require 183,400,000 turbines needing roughly: 461,000,000,000 tons of steel for the towers; 460,00,000,000 tons of steel and concrete for the foundations; 59,000,000,000 tons of copper, steel and alloys for the turbines; 738,000,000 tons of neodymium for turbine magnets; 14,700,000,000 tons of steel and complex composite materials for the nacelles; 11,000,000,000 tons of complex petroleum-based composites for the rotors; and massive quantities of other raw materials – all of which must be mined, processed, manufacturedinto finished products and shipped around the world.
Assuming 25 acres per turbine, the turbines would require 4,585,000,000 acres (1,855,500,000 hectares) – 1.3 times the land area of North America! Wells adds: Shipping just the iron ore to build the turbines would require nearly 3 million voyages in huge ships that would consume 13 billion tons of bunker fuel (heavy oil) in the process. And converting that ore to iron and steel would require 473 billion tons of coking coal, demanding another 1.2 million sea voyages, consuming another 6 billion tons of bunker fuel.
For sustainability disciples: Does Earth have enough of these raw materials for this transformation?
It gets worse. These numbers do not include the ultra-long transmission lines required to carry electricity from windy locations to distant cities. Moreover, Irina Slav notes, wind turbines, solar panels and solar thermal installations cannot produce high enough heat to melt silica, iron or other metals, and certainly cannot generate the required power on a reliable enough basis to operate smelters and factories.
Wind turbines (and solar panels) last just 20 years or so (less in salt water environments) – while coal, gas and nuclear power plants last 35-50 years and require far less land and raw materials. That means we would have tear down, haul away and replace far more “renewable” generators twice as often; dispose of or recycle their component parts (and toxic or radioactive wastes); and mine, process and ship more ores.
Finally, their intermittent electricity output means they couldn’t guarantee you could boil an egg, run an assembly line, surf the internet or complete a heart transplant when you need to. So we store their output in massive battery arrays, you say. OK. Let’s calculate the land, energy and raw materials for that. While we’re at it, let’s add in the requirements for building and recharging 100% electric vehicle fleets.
Wednesday, July 5, 2017
The Unsustainability of Sustainable Energy
Monumental, Unsustainable Environmental Impacts