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Return on Investment (ROI)

Return on Investment:

Return on Investment is represented as a percentage and is the same calculation that is utilized on any investment. There are two calculations, total return on investment over a period of time and the annualized return on investment over the same period of time. This calculation depend again on the same four factors from the above Break Even calculation (GESPER Cost, Actual Savings, Usage without GESPER, Rate).

The formula looks like the following:
Total ROI (%) = (Total Savings of kWH ($) - Cost of GESPER System ($) / Cost of GESPER System ($)
Annual ROI = Total ROI % / Number of Years