CSP stands for Concentrated Solar Energy.
Here are the total capital cost projections for a 4-hour utility lithium battery:
Source: NREL (2021).
Electricity storage costs decrease over time (see discussion of other renewable energy generation/storage/transmission costs). here), so over time we have to become more and more profitable (on a private cost basis, i.e. even without taking into account the externalities associated with the use of fossil fuels).