There is no reason they have to shut down generation completely. I'm quite skeptical of what they are on about here.Leeuwenhoek2 wrote: ↑Sun May 06, 2018 6:15 pm The rapid increase in solar which causes disrupting in the system the grid, adding variability, making management more complicated.
6:50 Rooftop solar
Can lose the equivalent of a large power plant instantaneously because of cloud cover over a city
7:40 Coal plants shut down and go cold because they are not needed during the day because of solar. But coal plants take time to start back up.
"We can't afford to have that load dip that much" = under good conditions, especially mid-day rooftop solar provides a lot of power. To the conventional generators that looks like "load" (demand for power) has dipped.
Sounds like they need a more aggressive collection of reactors on the grid to absorb reactive power when the demand from customers has dipped. They are basically a dummy loads to stabilize the grid. They are used on every major system at the end of the day when the customer load drops and the are excess vars on the system (they are also used in black starts - story for another time). Just like in the morning, in order to bring up the load, you would switch in equipment that adds capacitance to the system prior to customers "joining" the grid for the day. You do not want customer load to be responsible for bringing up the load which will happen at variable rates, so you control the increase with your own equipment and keep all of your protective systems happy.
If this is a financial concern I can understand - you don't want to generate power for hours at a time just to dump it into a reactor, but there are many ways to deal with this. Dynamic and flexible grid topology is the wave of the future with all these alternate forms of generation, especially with storage batteries on the horizon. This excuse about solar disrupting the grid seems like the tollbooth in the middle of the desert that they are trying convince everyone they must pass through. Just redesign your system. There really isn't an option on this anyway - even the above methods of stabilization are archaic in that regard. The next 50 years are going to be insane from a topology standpoint.
I didn't listen to the whole talk.
EDIT - Listened to many of the minutes you quoted - she is basically on point with what I was saying. Totally misunderstood the intention of the speech based on what was quoted. Very informative talk. Not really a dig against solar either. The business is changing and grids need to get a whole hell of a lot smarter.
Just my 2 cents...not exactly an expert on system design - I just fix it when its broken.