Figure also demonstrates that using CO 2 as a heat extraction fluid generally increases the available capacity at a given cost. For example, there is over 120 GW e of potential when CO 2 is used under 150 $/MW e -h but only about 40 GW e available for water. While 150 $/MW e -h is greater than Ormat's average PPA of 85 $/MW e -h, these supply curves were created using p50 data.