Utilizing pipeline co2 for energy storage

A system, comprising:

• a discharge subsystem operable to generate power from a high-pressure CO2 stream from a CO2 pipeline, the discharge subsystem including:
• an expander stage including a turbo-expander, wherein the expander stage is configured to expand and heat the high-pressure CO2 stream to form a low-pressure CO2 stream, and wherein the turbo-expander is configured to generate power based on a pressure differential between the high-pressure CO2 stream and the low-pressure CO2 stream;
• a dryer downstream of the expander stage;
• a thermal store downstream of the expander stage, the thermal store configured to cool the low-pressure CO2 stream and form a cooled low-pressure CO2 stream;
• and
• a low-pressure CO2 storage media configured to receive and store the cooled low-pressure CO2 stream;
• and
• a charge subsystem operable to compress the cooled low-pressure CO2 stream to generate a recycle high-pressure CO2 stream that is returned to the CO2 pipeline.

A system, comprising:

• a discharge subsystem operable to generate power from a high-pressure CO2 stream from a CO2 pipeline and output a low-pressure CO2 stream to a low-pressure storage media;
• and
• a charge subsystem in fluid communication with the low-pressure storage media, the charge subsystem operable to compress the low-pressure CO2 and provide a recycle high-pressure CO2 stream to the CO2 pipeline, the charge subsystem including:
• a first compressor stage including a compressor and a cooler, wherein the first compressor stage is configured to compress and cool the low-pressure CO2 stream from the low-pressure storage media and output an intermediate-pressure CO2 stream;
• a second compressor stage including a compressor, wherein the second compressor stage is configured to compress the intermediate-pressure CO2 stream from the first compressor stage and output a high-pressure CO2 stream;
• and
• at least one cooler downstream of the second compressor stage, the at least one cooler configured to further cool the high-pressure CO2 stream and output the recycle high-pressure CO2 stream to the CO2 pipeline.