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Technical guideFree to read2025

Powering GenAI data centers at speed: A renewable energy hub approach from off-grid to grid-connected operation

Hitachi Energy

A Hitachi Energy techno-economic study of an "energy hub" for a hypothetical 150 MW GenAI data centre that must start off-grid and connect to the grid later.

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Overview

The study centres on a hypothetical 150 MW site in Virginia. Over a 20-year life it compares a solar PV + BESS + diesel generator hub against generator-only operation, and a PV + BESS hub against grid-only supply, then a transition case that switches to grid after five years.

The basis: 150 MW peak load ranging 75-150 MW, 450 MW of PV ($820/kW), a 150 MW/300 MWh BESS, 150 MW of diesel generation ($300/kW, $3/gal) and grid power at $0.13/kWh plus $20/kW-month. The 450 MW of PV needs roughly 2,700 acres. AI racks are cited as drawing roughly seven times the power of traditional racks.

The off-grid hub cuts generator energy from about 982 GWh to 584 GWh per year against generator-only, and emissions from about 768 kt to 457 kt CO2e, with LCOE of about $0.152/kWh versus $0.20/kWh. The grid-connected hub has LCOE of about $0.123/kWh versus $0.14/kWh and emissions of about 188 kt versus 285 kt CO2e, 34% lower.

The transition case assumes grid interconnection after five years at $240/kW, giving an LCOE of about $0.164/kWh. The results depend on one hypothetical site and on the cost inputs chosen, so the same numbers should not be expected elsewhere.

Key points

  1. Study basis: 150 MW peak (75-150 MW range), 20 years, 450 MW PV ($820/kW), 150 MW/300 MWh BESS, 150 MW diesel ($300/kW, $3/gal), grid $0.13/kWh + $20/kW-month.
  2. 450 MW of PV needs roughly 2,700 acres.
  3. Off-grid hub vs generator-only: generator energy about 982 to 584 GWh/yr, emissions about 768 to 457 kt CO2e, LCOE about $0.152 vs $0.20/kWh.
  4. Grid-connected hub vs grid-only: LCOE about $0.123 vs $0.14/kWh, emissions about 188 vs 285 kt CO2e (34% lower).
  5. Transition case: grid interconnection after 5 years at $240/kW, LCOE about $0.164/kWh.
  6. AI racks are cited as drawing roughly seven times the power of traditional racks.

Using it in design

  • Support phased supply scenarios (off-grid hub then grid) with PV, BESS and generator sizing in the site/energy module.
  • Output LCOE, emissions and land area, using about 6 acres per MW of PV.
  • Provide cost-input defaults with clear provenance and let the user override them.
  • Flag when the on-site PV land requirement exceeds the site area.

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Who should read it

Planners and decision makers weighing energy and site strategy for large AI campuses whose grid connection will be delayed.

Related standards

  • GHG Protocol (Scope 2)

Publication details

Authors
Hitachi Energy
Publisher
Hitachi Energy
Year
2025
Document language
English
Source type
Manufacturer
Access
Free to read
Licence
Copyright retained; citation only — the publisher’s terms apply to the original document

Citation

Hitachi Energy (2025). Powering GenAI data centers at speed: A renewable energy hub approach from off-grid to grid-connected operation. Hitachi Energy. https://www.hitachi.com/content/dam/hitachi/us/en_us/insights/pdf/en_powering_genai_data_centers_at_speed.pdf

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