<
https://reneweconomy.com.au/trickle-recharging-using-a-combination-of-pumped-hydro-and-battery-storage-can-get-rid-of-gas/>
"Pumped hydro energy storage (PHES) provides very cheap energy storage
(gigawatt-hours). On the other hand, batteries are cheap for storage power
(gigawatts). Hybrid storage comprising PHES plus batteries provides very cheap
energy storage AND cheap storage power.
Normally, solar and wind are used to recharge PHES and batteries. However, at
times it is valuable to allow storage to “trickle-recharge” storage (despite
additional losses).
For example, Snowy 2.0 (350 gigawatt-hours (GWh) of energy storage + 2.2
gigawatts (GW) of storage power) can be coupled with 5 GW of four-hour
batteries located at grid strong-points.
Now we have cheap high-power (7 GW) and very cheap large-scale energy storage
(370 GWh). The total cost of this highly capable system is $20.5 billion ($12
billion for Snowy 2.0 + $8.5 billion for the batteries according to GenCost).
During calm and cloudy weather when energy prices go high, this hybrid system
can meet a 7 GW load from 5pm to 9pm. For the following 20 hours, the PHES can
trickle-recharge the batteries. It can do this for 12 days in a row before the
PHES is empty, whereas a battery-only system would be empty after the first
day."
Cheers,
*** Xanni ***
--
mailto:xanni@xanadu.net Andrew Pam
http://xanadu.com.au/ Chief Scientist, Xanadu
https://glasswings.com.au/ Partner, Glass Wings
https://sericyb.com.au/ Manager, Serious Cybernetics
