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Electricity grids designed around a small number of large, centrally dispatched power stations are increasingly being reshaped by the rapid growth of small-scale renewable generation, particularly rooftop solar panels installed by individual households and businesses. In several regions with high rates of residential solar adoption, grid operators have reported periods, typically around midday on sunny days, when local electricity supply from distributed rooftop panels exceeds nearby demand, forcing operators to either curtail output from these installations or rapidly ramp conventional generators up and down to absorb the swing once the sun sets and solar output disappears within a few hours. This pattern, sometimes visualised as a steep-sided demand curve resembling a duck's profile, has made grid balancing considerably more complex than in the era of predictable, centrally controlled generation, and has increased the value of technologies that can shift electricity consumption or storage across the day. Battery storage, both household-scale units and larger grid-connected installations, has emerged as the most widely deployed solution, absorbing surplus midday solar generation and releasing it during the early evening demand peak when solar output has fallen away. Costs for battery storage have declined substantially over the past decade, following a trajectory broadly similar to the earlier cost decline observed in solar panels themselves, making combined solar-plus-storage installations increasingly competitive with fossil-fuel generation on a pure cost basis in many sunny regions. Nonetheless, grid engineers caution that storage deployment has not kept pace with solar installation in most jurisdictions, leaving many grids exposed to instability during rapid transitions between high solar output and its evening absence, and that achieving a fully renewable grid will likely require complementary measures such as flexible industrial demand, cross-regional transmission links, and longer-duration storage technologies beyond standard lithium-ion batteries.