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Nearshore LNG to blue power.

Number: 04

Author(s) : DEYBACH F., PACTAT A., DINANT F., LE GUEN A., TOBES S.

Summary

Natural gas is expected to play a pivotal role in the energy transition by replacing other more carbonized fossil fuels (coal, oil) for power generation and also support the integration of renewable energy sources by mitigating their intermittency with swift ramp up. Historically, floating offshore facilities were primarily developed for oil and gas production, as well as for the storage and regasification of Liquefied Natural Gas (LNG). A few near-shore floating power plants (FPP) are also used for temporary power production, but usually with limited output and poor efficiency. This paper will introduce large, high efficiency, low emission floating power plants able to provide low carbon electricity to shore areas. Running on regasified LNG and equipped with a high efficiency
Combined Cycle Gas Turbine (CCGT) and post-combustion CO2 capture, they could offer a sustainable, temporary, or transitional dispatchable power generation solution with the flexibility to be relocated, eliminating the need for extensive land-based infrastructure, lowering cost and time to market.
Three innovative concepts were studied by TotalEnergies to assess their technical feasibility and economic viability. The high-efficiency H-class CCGT was modelled with THERMOFLOW GT PRO® software. The carbon capture system, based on a non-proprietary aqueous solvent (CESAR1) was designed for 90% CO2 removal. Process simulations were done with ASPEN HYSYS® software. 3D general arrangements and structural modelling were carried out. CAPEX & OPEX were estimated for each concept.
All concepts feature a natural gas fired CCGT installed topside. The main components of the CO2 capture system are either installed topside when considering a converted Very Large Crude Carrier (VLCC) or integrated into the structure when considering a newbuild barge, using horizontal crossflow columns instead of conventional vertical counter-current columns to minimize space and weight impact. These two concepts are connected to an FSRU supplying the plant with regasified LNG.
An "all-in-one" integrated version has also been developed, featuring 170 km³ of LNG storage and 500 MMscfd regas, along with the CCGT and CO2 capture and liquefaction. Coupling LNG regasification with the CCGT and the CO2 liquefaction reduces the energy consumption of this integrated solution.
These innovative setups aim to deliver more than 560 MWe of electricity with a carbon intensity below 40 gCO2/kWh. The total plant cost for engineering, procurement, construction, and installation of the three concepts is evaluated.
In conclusion, integrating carbon capture with floating natural gas power plants, which can be rapidly deployed and scaled to meet increasing electricity demands, provides a practical solution for decarbonization. This approach based on existing technologies rapidly deployable could help mitigate climate change while ensuring energy security and without antagonizing other longer term
decarbonizing strategies.

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Details

  • Original title: Nearshore LNG to blue power.
  • Record ID : 30034617
  • Languages: English
  • Subject: Environment
  • Source: 21st International Conference & Exhibition on Liquefied Natural Gas (LNG2026)
  • Publication date: 2026/02/05

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