According to Mercom India, the Solar Energy Corporation of India (SECI) has invited proposals to select agencies responsible for preparing detailed project reports (DPRs) for green hydrogen hubs under Component B1 of the National Green Hydrogen Mission. While specific site locations, plant capacities, and funding allocations have not been disclosed in the initial call, the commissioning of DPRs represents the critical bridge between regional policy ambitions and front-end engineering design (FEED). For plant engineers and project developers, these reports will dictate how multi-user hydrogen infrastructure, shared utilities, and power-to-gas assets integrate at commercial scale.
Electrolyser Architecture and Power Conditioning
A primary objective of any hub-scale DPR is defining the shared power architecture and electrolyser topology. Unlike isolated generation assets, a hydrogen hub must aggregate variable renewable power—potentially from multiple distributed solar and wind assets—and deliver stable, conditioned direct current to high-capacity electrolyser arrays. Engineering teams drafting these reports must resolve several technical challenges:
- Rectifier and power quality design: High-capacity electrolyser plants demand multi-pulse thyristor or insulated-gate bipolar transistor (IGBT) rectifiers. The DPR must establish limits for total harmonic distortion and reactive power compensation at the substation interconnect to prevent grid degradation during rapid ramp-ups and ramp-downs.
- Technology selection: The reports must evaluate the trade-offs between alkaline and proton exchange membrane (PEM) systems. While alkaline systems offer lower capital expenditure for baseload operation, PEM systems offer greater operational flexibility to track rapid renewable generation swings. In a shared hub model, hybrid configurations may be required to balance capital costs against dynamic response needs.
- System modularity: DPRs must lay out physical footprint provisions, establishing whether systems rely on skid-mounted containerised units or field-erected multi-megawatt stack halls with centralised gas-liquid separation.
Water Treatment and Utility Demands
Hydrogen production requires substantial balance-of-plant support, with water purification representing one of the strictest design constraints. Commercial electrolysers require ultra-pure water to prevent catalyst poisoning and membrane scaling. For hub developers, the DPR must formulate comprehensive utility balances:
- Demineralisation trains: The engineering scope must assess local raw water chemistry and specify multi-stage treatment, typically pairing reverse osmosis with continuous electrodeionisation. In industrial corridors where municipal or river water is scarce, the DPR must evaluate seawater desalination or tertiary treated industrial wastewater, directly impacting the parasitic load of the facility.
- Effluent and brine management: High-recovery treatment trains generate concentrated brine streams. Hub planning requires centralized
Source
This analysis was written from reporting by Mercom India: SECI Invites Proposals to Prepare DPRs for Green Hydrogen Hubs, published 28 September 2026. Figures and events above are as reported there; the engineering commentary is ours.
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