Source:
https://www.realclearenergy.org/articles/2021/02/26/building_back_better_means_blackouts_and_fragile_grids_661910.html
"South Australia in 2016; California last year; now, Texas.
The recent blackout is a terrible ordeal for Texans but a political disaster for the Biden administration.
The president had just signed an executive order making climate change the organizing principle of his administration.
All coal and natural gas power stations are to be taken off the grid by 2035.
To solve the climate crisis, America is to be powered almost exclusively by wind and solar, with a smattering of nuclear and hydropower.
... At 4 p.m. on February 14, Texas, with the most installed wind capacity of any state, was producing 9,101 megawatts (MW) of power.
By 8 p.m. the following day, wind output was just 649 MW, a fall of 92.9%.
... It doesn’t take a genius to figure out that increasing dependence on weather-dependent, weather-exposed power generation is a formula for grid unreliability and blackouts.
... since 2015, Texas has been relying entirely on wind and solar to meet demand growth and now has less gas and coal generation than five years ago.
... The greater the reliance on wind, the more devastating will be the consequences of the weather not being right when demand surges.
Microsoft founder Bill Gates argues that the solution is to weatherize wind turbines against the cold and to connect the Texas grid to the rest of the nation.
But weatherizing wind turbines doesn’t make the wind blow when there isn’t any.
Grid interconnectors are a sensible way for neighboring systems to trade electricity with one another, but they can also be used by countries with large amounts of wind and solar, such as Germany, to dump their balancing problems onto their neighbors.
In response, Poland, the Czech Republic, and the Netherlands have phase-shifting transformers to control unwanted power surges from Germany.
Interconnectors are no lifeline during times of acute grid stress.
Like Texas, the state of South Australia relies heavily on wind power.
In September 2016, a severe storm knocked out some transmission towers and forced six wind farms to curtail their output.
The interconnector with neighboring Victoria was already over its safety limit.
Within seconds it tripped, and much of the state was plunged into darkness.
The ability of the grid to cope with sudden supply-demand imbalances and maintain frequency is determined by the inertia in the system.
Grid managers must also keep grid frequency within tight limits.
The 600-ton turbines of coal-fired power stations spin at 3,000 rpm, generating synchronous power and providing system inertia.
... wind and solar (are) non-synchronous ... with low-to-zero physical inertia.
Having lots of renewable capacity makes for a less stable grid.
... In August 2019, large parts of southern England saw their power cut off during a period when a record 67% of electricity demand was being met by wind.
A sudden loss of generating capacity, thought to be caused by a lightning strike, was followed by a sharp drop in grid frequency that led grid managers to initiate a cascade of disconnections to restore grid stability.
Britain provides a textbook example of decarbonizing the grid and the distortions caused by renewable energy subsidies.
Wind and solar have high fixed costs but close to zero variable costs, as the energy inputs from wind and sun are “free.”
That means coal and gas can’t compete when the wind is blowing and the sun is shining.
In the four years before 2016, the economically destructive effect of subsidizing zero-marginal-cost output saw Britain’s Big Six energy companies rack up cumulative losses of £2,096.4m ($2,945.4m) from their coal- and gas-fired power stations.
These losses led them to run down their thermal assets, and three of the Big Six exited thermal generation altogether.
... In 2019, the Big Six obtained an average wholesale price of £116.64 ($163.41) per megawatt hour (MWh) for renewable electricity – 58% more than the £73.58 ($103.09) per MWh they received for electricity generated by their thermal-power stations, which are critical for keeping the lights on and the grid stable.
Consumers bore the burden of the renewable subsidies.
In those three years, Big Six residential customers saw the average price of electricity rise by 27.7%, to 18.08p (25.33 cents) per kilowatt hour (kWh), leading them to cut their electricity consumption by 12.1%.
Gates and others blame the Texas blackout on the failure of power-station owners to weatherize their plants.
But these owners have little incentive to invest in their plants when faced with falling load factors brought about by the growth of wind output – and now with an administration that wants to push them off the grid altogether.
... Texans would be better off if the state had no investment in wind power; its grid would be more resilient, and investment in thermal generation plants would have been stronger.
... Scientists are divided as to whether Texans are suffering from the effects of man-made climate change.
But there can be little doubt that they are suffering from the destructive effects of climate-change policies."