There’s More to Electrical Power (& Vehicles) Than Just Generating Electricity
Anyone interested in really understanding electric power ought to read this article. It’s a real eye-opener:
http://daniellefong.com/2010/02/11/how-law-shapes-the-business-landscape-and-a-patent-puzzle
The first part of the article is about skin cancer detection (someone in Britain actually introduced a detector recently, btw), but most of it is about the electrical grid, and how messed-up policy has, well, messed up electric power in the U.S. Government policy focuses largely on generating electricity, but it turns out power generation is almost the easy part.
The harder parts are ’smart’ (efficient) & secure (against cyber-attack, electromagnetic pulse (EMP), etc) transmission, and especially energy storage, which gets almost no attention at all.
The grid, as it exists today, has almost no capacity to store energy. This means that at every instant in time, the amount of energy going on to the grid must almost exactly equal the amount of energy coming off. Otherwise, the grid rapidly fails in its operation, rising too high or too low in voltage, or shifting frequency, or succumbing to noise, spelling disaster to everything dependent upon a smooth, steady stream of power for its operation. That is to say, nearly every device of the modern world.
And while we have some provisions to redirect power on the grid… our ability to throttle the amount of power we put onto the grid is slow and expensive. Gas turbines are the power plants that can be controlled most readily, however their power must be throttled over a period of nearly 15 minutes. When they do this, however, they operate away from their most efficient operating point, meaning that lots of fuel is burned, power is expensive, and more CO2 goes out the stack into the air. Hydropower stations can be throttled nearly as readily as gas turbines, but they can operate in a wider range before they lose most of their efficiency. Coal, petroleum, and nuclear plants, on the other hand require periods on the order of days to speed up and slow down — it takes about that long for them to relax to a thermal equilibrium, keeping thermal stresses within safe bounds.
However, the electrical demand is quite unpredictable, and it can vary significantly in a period much shorter than the 15 minutes it takes for our fastest power plants to significantly alter their power output. So to respond in faster timescales, power plants must run as ‘spinning reserves.’ This is where fuel is burning and the turbine is spinning, constantly, in expectation of a fluctuation. There are now massive power plants, burning fuel this very second, for no purpose other than to smooth out the rapid fluctuations on the grid. I hope I don’t need to point out how crazy this is.
What’s more, electrical supply from renewables is very unpredictable, especially whatever’s coming from distributed power. Wind power is the least expensive…, but in terms of supplying controllable, usable power, wind is terrible! Wind power varies rapidly and widely, is extremely difficult to predict, is quite correlated over large regions, and, what’s probably the worst, wind power comes mostly in the dead of night, when nobody needs it.
Now, consider in all you’ve heard/read about electrical energy and electric vehicles, have you ever heard any of that?? Just another example of how the mainstream media is failing us, once again not bringing to light some of the key issues.
