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The grid is relay protected for under & over voltage, over & under current, over & under frequency & instantaneous current. The "grid" would hardly notice a change of 1MW. The grid can take 1000mw plant instantly tripping off line, frequency drops just a little, but the plants that are operating in what is called spinning reserve will pick up the load. The relay protections are for the power lines to prevent them from being over loaded, mainly from a short caused by tree branches, cars hitting power poles, downed lines etc. If 1mw of charging stations are connected to the lines to a sub station and on to the grid, the system is designed to take the load, or it wouldn't be there.
a common voltage for equipment at my plant is 4,160V. Our feed pumps, 3.7MW to run. Our plant output is around 600Mw @ 230Kv.
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1972 Dodge Challenger
2011 Raptor
2013 Road King 110th Anniversary
2014 Corvette Z51 stingray
Single after 27 years married.
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