The latest snowstorm knocked out electric power for about 100,000 Cape Cod households and, according to NSTAR, many in southeastern Mass. will remain without juice through Thursday (outage map here). Cue daydreams of the power outage bandaid - the almighty generator. While common in luxury digs and nuclear power plants (thankfully), what about back-up generators for the rest of us? Here now, 20 Cape Cod listings with generators, all asking under $1M.