Investor Presentaiton
Duck Curve Becoming More Extreme
Changing California Supply Mix Results in Market Imbalance and Instability
Actual net-load and 3-hour ramps are
about four years ahead of ISO's
original estimate
MW
28,000
Typical Spring Day1
2012 (actual)
2013 (actual)
26,000
24,000
22,000
20,000
18,000
2014
16,000
2015
2016
14,000
2018
2017
potential overgeneration 2019
2020
12,000
10,000
Actual net load of 6,964 MW
on Feb. 18, 2018
0
12am
3am
6am
9am
12pm
Hour
3pm
6pm
9pm
increased ramp
Actual 3-hour ramp of 14,432
MW on Feb. 23, 2018
Solutions are necessary to handle the
deeper belly and steeper ramps of the
duck curve including:
■ Battery storage - increase the
effective participation by energy
storage resources
■ Flexible fast ramping generation –
invest in fast-responding resources
like gas-fired generation that can
follow sudden increases and
decreases in demand
1 CAISO
AltaGas
See "forward-looking information"
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