This doesn’t really capture their meaning though. They are describing a change in how the solar generated electricity can be treated due to the changing battery prices.

Arguably your edit is more factual. But part of the job of the title in an editorial like this is to tell you what their perspective is.

I assume the intended meaning is “reduced battery costs make around-the-clock solar-generated electricity possible”. I don't think it's possible to predict how technical changes in electricity production and storage impact prices.

"Falling battery costs make electricity from solar viable day and night"