This has been an intersting topic for HGC the last week or so - and there is more coming on this topic....
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Global Energy Education's Global Energy Education TV (www.geetv.net) enabled me to do a 'smash-up commentary on two recent posts by EPRI's Michael Caravaggio and Stanford University's Mark Jacobson. Michael's post showed data pertaining to CO2/kWh from the Grid per CAISO for the past 5 yeas, while Mark's post is one of recent daily posts showing how far renewable energy has come in California, with Renewable Energy sources of electric power generation able to exceed midday Demand for electricity for a record number of days in a row, yet why that doesn't appear to have a significant impact on the CO2/kWh in the electricity coming from the Grid. The bottom line? As I've noted before, the Grid is a single machine, and the electricity dispatched by the Grid is comprised of ALL generating sources. Secondly, the net amount of electricity dispatched must equal the net amount of electricity put into the Grid instantaneously. The current Achilles heel to a zero CO2/kWh Grid? The need for a Carbon-free flexible generation technology that is not limited by geology, hydrology, or location limitations. Batteries with solar can play a significant role when considering reliability, and resiliency, as shown in Mr. Jacobson's charts. However, they are expensive, and may not be the ideal solution in other states with less solar insolation. Plus, there is the issue of Long Duration Storage, especially in those regions with long summer days and long winter nights. Your thoughts?