Climate change — and changing political winds — are prompting shifts in strategy at California’s largest agricultural water district. Westlands Water District, which occupies some 1,100 square miles of the arid San Joaquin Valley, is in the midst of an internal power struggle that will determine how water fights unfold across the state. After years of aggressively fighting for more water, Westlands is making plans to live with less. In 2016, Donald Trump campaigned in the valley, promising to “open up the water” for farmers in the then-drought stricken state. Its leaders are now sounding a more Biden-esque note: They are planning to cover a sixth of the district with solar panels to start “farming the sun” instead of thirsty crops like almonds and pistachios.