Hell, back in 1979-80, Texas Utilities was looking at putting a CO2 separator on the two bigger units at the Morgan Creek plant (gas fired) where I was working. We were going to sell the CO2 to the oil companies for Tertiary oil recovery efforts in the Permian Basin. We got as far as preliminary construction design when a big deep gas strike in the upper panhandle happened and this gas had a high percentage of CO2 in it that was easier to deal with than furnace stack gasses. If I remember right, the separator process for the 500 MW unit was going to take around 3-4 MW to separate the CO2 out from the rest of the gasses.
Yes it is an effective CO2 source. It just is not a free CO2 source, or even an economically competitive source, as the post I responded to was discussing.
I notice you said they work looking at doing this. I believe they never did due to cost. There are cleaner and less costly sources such as: The natural CO2 deposits at McElmo Dome (CO), Bravo Dome (NM), and Sheep Mountain Dome (CO) are estimated to hold upwards of 20 Tcf of recoverable CO2. CO2 emissions, from gas processing plants and hydrogen plants in the region (estimated at 384 MMcf/d), could provide additional high concentration (relatively low cost) CO2.
More info available:
BASIN ORIENTED STRATEGIES FOR CO2 ENHANCED OIL RECOVERY:
EAST & CENTRAL TEXAS
http://www.adv-res.com/pdf/Basin%20Oriented%20Strategies%20-%20East%20&%20Central%20Texas.pdfCarbon Dioxide Enhanced Oil Recovery (CO2 EOR):
Factors Involved in Adding Carbon Capture, Utilization and Storage (CCUS) to Enhanced Oil Recovery
http://neori.org/Melzer_CO2EOR_CCUS_Feb2012.pdfPermian Basin CO2 EOR Volumes Sold
Approximately 90% of the CO2 supplies have been provided by the “big four” suppliers: KinderMorgan, ExxonMobil, Oxy, and SandRidge. In recent years, Hess and Trinity CO2 have joined the list with the latter emerging as a “proxy” supplier by way of aggregating some supplies from small interest owners in McElmo Dome and a small natural gas plant recovery plant, La Veta, near the Sheep Mountain source field in south central Colorado.
The breakdown of this supply by CO2 source is shown in Figure 5.3.2 and Table 5.3.2. As shown, the vast majority of these supplies (1.15Bcfd or 33 MMcmd) come from McElmo Dome. Oxy’s Bravo Dome (combined in Figure 5.3.2 with Hess’ West Bravo Dome) is next and the remaining four make up the difference in roughly equal volumes.

Current Permian Basin EOR Projects and CO2 Supply
https://hub.globalccsinstitute.com/publications/bridging-commercial-gap-carbon-capture-and-storage/53-current-permian-basin-eor