The exact extract states that one major purpose of building energy storage is to solve the weak-grid problem under high renewable energy penetration. The correct answer is A. True. Renewable energy sources such as PV and wind are variable and inverter-based, which means high penetration can create grid challenges such as voltage fluctuation, frequency instability, low inertia, curtailment, and difficulty balancing generation with load. Energy storage helps solve these issues by absorbing excess renewable generation, releasing power when generation drops, supporting frequency and voltage stability, smoothing output, and improving grid-forming or grid-support capability. In Huawei Smart PV Plant and Smart String ESS scenarios, storage is not only for energy shifting; it is also a grid-stability asset. This is especially relevant in weak-grid areas where renewable generation is large but the grid is not strong enough to absorb rapid power variation. Therefore, the statement is technically correct. Reference: Huawei HCSA-Sales-Smart PV V2.0 Smart PV Plant Solution training extract.
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