The document discusses issues with high penetration of photovoltaics (PV) and the role of energy storage solutions. High PV penetration can cause problems with generation mix, instability on high-penetration feeders, and reverse power flows. Storage can help integrate more PV by smoothing output over seconds/minutes and shaping output over an hour to conform with forecasts. Locating storage near PV or consumers maximizes value. Optimizing energy storage requires minimizing costs while capturing multiple value streams like peak shaving and grid services to allow higher levels of renewable energy on the grid.