Scientific American: In the first installment of this post, Arnold Mckinley of Xslent Energy Technologies described how "reactive power" — that is, power stored momentarily by electrical appliances and then released — destabilizes the electrical grid. Here he explains how home solar arrays can help. Electricity has traditionally been distributed using a wheel and spoke grid: power travels from a large central generator to loads distributed around it. In some cases, energy travels very long distances, …