http://www.adom.de/forums/project.php?issueid=1371 was marked as "Won't Fix" because of not willing to fiddle with the integer calculations. If the calculations are coded with the formula that's mentioned in the manual, then the solution should be as simple as changing 100000 in the formula to something higher like 1000000 (that will be sufficient to any single energy cost reduction from 1000), see http://www.adom.de/forums/project.ph...=1371#note8137. For combined energy cost reductions even higher number might be required (preferably as high as it's possible to use without getting integer overflow).

Having that multiplier higher essentially just adds more decimal places (= more precision) in the fixed-point decimal that's used in the intermediate calculations.