The two problems may seem unrelated, but Old Dominion leaders believe they could be mitigated by a common solution: Use the same plot of land for both farming and solar panels. That’s the idea behind a new state law that officially defines ​“agrivoltaics,” the dual use of land for agriculture and solar photovoltaics. Experts say solar is the cheapest, quickest way to meet the colossal needs of large electric customers like data centers. As of early this year, nearly two-thirds of Virginia counties outlawed or severely restricted large-scale solar. Sheep and other livestock can graze beneath solar panels — helping enrich the soil and stopping it from running off into waterways.