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A major piece here (electricity storage) is V2G ( https://en.wikipedia.org/wiki/Vehicle-to-grid ).

Reducing emissions related to transportation leads to electrical vehicles, and therefore to a vast amount of batteries, most not used at any given moment and therefore ready to store overproduction or release needed electricity.

Batteries' performance are quickly progressing, and their prices history is clear: https://ourworldindata.org/battery-price-decline

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car batteries aren't great for storing and retrieving energy for grid usage. to expensive for too few cycles.

This very average frequency/amplitude/speed of discharge, for any given battery, depends upon many parameters (during most of such 'call to batteries': slope of the call and quantity of electricity needed, duration, proportion of vehicles connected to the grid...).

This is part of the solution, as we have ways to reduce effects of intermittency on production (mainly a mix spread over the continent), other ways to store electricity (hydro, green hydrogen-burning turbo-alternators...), and curtailment...

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