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The reason is that gas power is too expensive and coal power is not flexible enough to compensate intermittencies at the hourly-scale pace in which they appear.
First, the intermittency balancing problems on cloudy and windless days could be managed only because utilities backed up intermittencies by running fossil power plants--and running them in ways that were uneconomic and especially bad for the environment.
These hallucinatory signs end up being a sort of concise representation of life, made up of intermittencies, sudden changes in tension, pauses, and resumptions, moments of electricity and blackout.
Figure 1 compares the capability of various measuring devices to detect intermittencies of varying lengths.
HALT/HASS testing can miss developing intermittencies if digital instrumentation is used.