TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The geothermal power plant has at least one main stage steam separator which produces flashed geothermal brine and produces steam which is provided to a steam turbine, where the gas-rich vapor is separated from geothermal brine before the geothermal brine enters the main stage steam separators. The gas-rich vapor contains at least 1.5 (preferably 50) mol.% of carbon dioxide, where at least a part of the gas-rich vapor is combined with the flashed geothermal brine before the flashed geothermal brine enters the binary heat exchanger, and the moles of carbon dioxide are added to the flashed geothermal brine at least equal: the equivalents of non-carbonate alkalinity in the flashed geothermal brine; or the sum of equivalents of non-carbonate alkalinity plus one-fourth the total alkalinity in the flashed geothermal brine. The moles of carbon dioxide added to the flashed geothermal brine do not exceed the sum of equivalents of non-carbonate alkalinity in the flashed geothermal brine plus equivalents of total alkalinity in the flashed geothermal brine. The amount of gas-rich vapor combined with the flashed geothermal brine is sufficient to decrease the rate of scale deposition at the exit of the binary heat exchanger by at least 50%, preferably at least 75%. At least a part of the gas-rich vapor is combined with the flashed geothermal brine while the flashed geothermal brine is inside of the binary heat exchanger. A two phase geothermal fluid is separated to produce the geothermal brine and a vapor phase, and the gas-rich vapor is produced by partial condensation of a predetermined portion of the vapor phase. The flashed geothermal brine is characterized by a pH value at the exit of the binary heat exchanger. A sufficient gas-rich vapor is combined with the geothermal brine to decrease the pH value by at least 0.5 (preferably at least 1.5) units. Preferred Components: At least one of the locations is between the main stage steam separators and binary heat exchanger. The geothermal power plant (I) further comprises an auxiliary heat exchanger where the gas-rich vapor is partially condensed before being combined with the flashed geothermal brine. EXAMPLE - No suitable example given.