R. I learned that as PIE where I= current. Here's something to think about: during the day full load requires 100kv on primary but at night with a reduced load 50kv would be plenty. A smart Xformer with smart distribution center "automatically" switch to the lower level. Network wide this would be a big deal.
L. I learned that way too. Some use A for amps. The turns ratio of the xformer would be the same, so secondary voltage would be cut in half and you would burn out anything having a motor. The best way to save power is to put the transformer as close to the load as practical to reduce line loss.