GE Vernova announces order of 674 wind turbines, providing 2.4 GW of power

Original Article ↗ Hacker News Discussion ↗

GE Vernova’s 2.4 GW SunZia wind project in the U.S. Southwest prompts comparisons with larger global wind farms and with nuclear power, raising questions about cost per kWh, capacity factors, and the heavy share of spending on long-distance transmission. Commenters debate whether utility-scale wind and solar plus batteries can economically replace fossil fuels and nuclear, contrasting cheap wholesale renewable generation with grid integration challenges, storage limits, and the high but dispatchable output of nuclear plants. Environmental and social impacts—ranging from hydro dams’ damage to river ecosystems to land use, wildlife, and Indigenous sovereignty issues around new transmission corridors—feature prominently as people weigh different “green” options and the role of rooftop solar versus centralized projects.

Project scale and comparisons

  • 2.4 GW nameplate makes this one of the largest onshore wind farms globally, but behind China’s Gansu (3–4x larger).
  • Comparable in size to early phases of the UK’s Hornsea offshore project (Phase 1+2 ~2.5 GW, targeting 6 GW total).

Costs, capacity factor, and electricity prices

  • Total project financing around $11B, with commenters saying roughly half is transmission, half generation.
  • Back-of-envelope estimates using 25–45% capacity factor yield ~5.8–10.5¢/kWh before O&M if depreciated over 20 years; seen as viable against ~16¢/kWh Arizona retail rates.
  • A nearby 350 MW project with 46% capacity factor reportedly sells at ~$40/MWh, or ~$60/MWh without tax credits, suggesting this project should be well under 10¢/kWh wholesale.
  • Others cite UK offshore wind LCOE around 6¢/kWh as a benchmark and argue 10¢ is a high upper bound.

Transmission and the SunZia line

  • Transmission is highlighted as a major cost (~$100–120/mile in one estimate) and growing share of total system cost.
  • The associated SunZia HVDC line faces environmental and tribal sovereignty objections; some see legitimate concerns, others see negotiation or NIMBY dynamics.

Residential rooftop solar and grid economics

  • Large sub-thread debates whether rooftop solar “freeloads” on the grid:
    • One side: rooftop solar is expensive per kWh, doesn’t reduce peak capacity needs, and underpriced T&D plus retail net-metering shifted costs to non-solar customers.
    • Other side: utilities are using “fairness” as a pretext to kill distributed generation that threatens profits; argue for time-based pricing and fair compensation for peak exports.
  • Examples discussed: California’s shift from generous retail net metering (NEM2) to much lower export credits (NEM3), and early-stage rooftop expansion in Spain, Netherlands, and Belgium.

Hydro and ecological tradeoffs

  • Hydro compared as much larger in scale (e.g., 22 GW dams) but with significant ecological impacts: blocked fish migration, ineffective fish ladders, altered river habitats, sediment issues, and problematic dam siting/management in some countries.

Storage, batteries, and grid integration

  • Several comments explore adding batteries:
    • Co-locating large battery systems at wind/solar farms is considered economically sensible for arbitrage and better use of transmission.
    • Putting batteries in each turbine base is seen as unnecessary and more expensive than centralized storage.
  • Broader point: optimal storage location depends on transmission bottlenecks and demand patterns.

Nuclear vs renewables debate

  • Recurring contention:
    • Pro-nuclear commenters emphasize firm, low-carbon baseload and argue nuclear is essential once EVs and demand scaling are considered; point to storage limits and long calm/cloudy periods.
    • Critics argue nuclear is not cost-competitive, suffers chronic cost and schedule overruns (e.g., Vogtle and recent European projects), and that wind/solar projects have much better track records on time and budget.
    • Some attribute historical and current messaging about nuclear/renewables to fossil-fuel industry interests, though this is disputed.

Local impacts, NIMBY, and aesthetics

  • Mixed views on visual and environmental impact:
    • Some see wind farms as “ugly” and landscape-industrializing, raising concerns about rural tourism and wildlife.
    • Others consider them relatively light-touch (e.g., grazing under turbines) compared to large dams or nuclear sites and argue some habitat encroachment is inevitable for any large infrastructure.