Well... the long story short is that a smart-grid works better than a classic one. This example is a very limited kind of smartness, just "stop what you can sto

Well... the long story short is that a smart-grid works better than a classic one. This example is a very limited kind of smartness, just "stop what you can stop on a strained grid to keep it up", for certain kind of loads in certain countries is a mandatory things: in France IVRE norms for domestic EV charging stations demand a device connected to the utility meter data port (2-wires system) to allow the grid stop (and potentially in the future just regulating the maximum allowed amps) a charge if needed, in some other countries I've read it's common to have connected thermostats the grid can tweak to lower heating/condition when there is too much energy demand. The issue of a smart grid though it's the fact that we need software from various actors, talking together, to regulate a DELICATE and CRITICAL infra. Just imaging if in a nation-wide smart-grid a bug or an attack tell all connected cars/chargers "please charge at maximum amps, we have a renewable production spike, we need load to lower the frequency" while the grid is definitively NOT in such situation or simply the potential cascading effects of some smart-grid demand that can't be immediately applied by all smart-connected customers, creating something we can see also in domestic p.v. with ac-coupled classic string inverters, where the battery inverter demand more energy to the p.v. inverter, while a small cloud reduce the p.v. output, the cloud go, the p.v. suddenly inject much more and the battery inverter flip "reduce, reduce, reduce", another cloud, another spike. IMVHO there is so far no tech safe enough for a PUBLIC smart-grid, we can at maximum have smart-grid-homes meaning local batteries (perhaps small + the EVs in V2H bi-directional direct DC-to-DC mode, since most cars use 400V batteries as most p.v. hybrid inverters on sale, there is no damn reason for a double DC-AC-DC conversion like Tesla PowerWall and others do) and local p.v. keeping a separate home grid, with the national grid directly powering only the main inverter or islandic device. The local system can just keep watching grid frequency shifting regulating the eventual p.v. surplus injection only if the grid frequency is a bit low, and using batteries to a certain SOC level if there is no p.v. and grid frequency is low and tend to trend lower in a certain timeframe. It's not smart, but at least it can't destabilize the grid much, an eventual attacker must been able to poison frequency shifting signals witch typically means having last mile physical access on the grid, something doable locally, but hard to do at a nation-wide or at least wide-enough areas to destabilize the grid.