Thanks Rainer. Is it possible that POET has factored in the demand charge reductin. Most large sites have commodity rates plus a demand charge. Some utilities charge a demand charge that is set at the highest incurred peak demand and that rate then applies for the month. If you substantially reduce the peak demand then the fixed demand charge could be substantially reduced. This would be especially the case for the cooling which varies thru the day and season. Here is link to PG&E rates (California) http://www.pge.com/tariffs/electric.shtml

The rates range from about $5 to $19/kW/month