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# Decarbonization Synergies From Joint Planning of Electricity and Hydrogen Production: A Texas Case Study

### Abstract

Hydrogen (H2) shows promise as an energy carrier in contributing to emissions reductions from sectors which have been difficult to decarbonize, like industry and transportation. At the same time, flexible Hproduction via electrolysis can also support cost-effective integration of high shares of variable renewable energy (VRE) in the power system. In this work, we develop a least-cost investment planning model to co-optimize investments in electricity and Hinfrastructure to serve electricity and Hdemands under various low-carbon scenarios. Applying the model to a case study of Texas in 2050, we find that H2 is produced in approximately equal amounts from electricity and natural gas under the least-cost expansion plan with a COprice of $30–60/tonne. An increasing COprice favors electrolysis, while increasing H2 demand favors Hproduction from Steam Methane Reforming (SMR) of natural gas. Hproduction is found to be a cost effective solution to reduce emissions in the electric power system as it provides flexibility otherwise provided by natural gas power plants and enables high shares of VRE with less battery storage. Additionally, the availability of flexible electricity demand via electrolysis makes carbon capture and storage (CCS) deployment for SMR cost-effective at lower COprices ($90/tonne CO2) than for power generation ($180/tonne CO). The total emissions attributable to H2 production is found to be dependent on the H2 demand. The marginal emissions from Hproduction increase with the Hdemand for COprices less than$90/tonne CO, due to shift in supply from electrolysis to SMR. For a CO2 price of $60/tonne we estimate the production weighted-average Hprice to be between$1.30–1.66/kg across three Hdemand scenarios. These findings indicate the importance of joint planning of electricity and H2 infrastructure for cost-effective energy system decarbonization.

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