Tesla strikes another mammoth energy storage deal in California

Re:Tesla strikes another mammoth energy storage deal in Cali... by dillondoyle on Wednesday July 04, 2018 @01:10PM (#17458306)

I don't know energy units at all so sorry if this is dumb. But is 2 GW the same as 20 * 100 MW? So $74mm * 20 = 1.48 billion which is less than 2.8 ? E.g. battery is cheaper?

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Re:Tesla strikes another mammoth energy storage deal in Cali... by gsbraitberg on Wednesday July 04, 2018 @01:20PM (#17458365)

The relevant unit is storage (kWh-- kilowatt hour), not power (MW-- megawatt).

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Re:Tesla strikes another mammoth energy storage deal in Cali... by dillondoyle on Wednesday July 04, 2018 @02:30PM (#17458747)

Ah ok. So kWh is like the length of time of that amount of energy delivered. What's the 2 GW then, like max through put at a given moment in time? So the two examples water storage lasts a really long time but a smaller relative rate of discharge versus battery could discharge the amount stored a lot quicker?

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Re:Tesla strikes another mammoth energy storage deal in Cali... by pouetpouet on Thursday July 05, 2018 @08:10AM (#17462599)

kWh is for energy stored in this example, the "size of the tank". kWh is analogous to toe (tonne of oil equivalent) or gallons of gas. kW is for power, that is the flow of energy (energy/s), another non SI unit is horsepower. The SI unit for energy is Joule (J), the SI unit for power is J/s. 1 Watt is 1 Joule per second.

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Re:Tesla strikes another mammoth energy storage deal in Cali... by Tepix on Wednesday July 04, 2018 @01:39PM (#17458480)

Both are relevant, depending on the purpose.

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