Why Build Nuclear When We Have Solar?
I Asked If Solar Could Power California… and It Got Complicated
What started as a simple question turned into a full-blown debate:
If solar panels and batteries are getting so good…
why does California still need nuclear energy?
In this episode, we break down what actually keeps the lights on — beyond headlines, hot takes, and LinkedIn comment wars.
What You’ll Learn
Why “more solar” doesn’t automatically solve the problem
Solar energy is powerful — but it only works when the sun is shining.
Electricity systems need to work all the time, not just during ideal conditions.
The difference between dispatchable and weather-dependent power
Not all energy sources behave the same way.
- Dispatchable power = can be turned on whenever needed
- Solar & wind = depend on weather and time of day
This distinction is at the heart of how power grids are designed.
Why batteries help… but don’t solve everything
Batteries can store energy for hours — not days or weeks.
Scaling them to support an entire grid would require:
- massive infrastructure
- large amounts of materials
- and systems we haven’t fully built yet
The “last 10% problem”
Getting to ~80–90% clean energy is achievable.
But the final stretch to 100%?
That’s where:
- costs rise sharply
- reliability becomes harder
- and system complexity increases
Capacity factor (explained simply)
Not all energy sources produce power at the same rate over time.
- Nuclear: ~90% uptime
- Solar: ~20–25% depending on location
This affects how much infrastructure you need to meet demand.
What is grid inertia?
Power grids rely on physical stability — not just energy supply.
Traditional plants (like nuclear and hydro):
- use large spinning turbines
- help stabilize frequency and flow
Solar and batteries don’t naturally provide this, which means engineers must recreate it in other ways.
Nuclear’s role in a clean energy system
Nuclear isn’t replacing renewables.
It provides:
- consistent, 24/7 power
- high energy output from a small footprint
- stability for the grid when other sources fluctuate
Special Thanks
Thank you to everyone who contributed to the original discussion!
Find the post here: https://www.linkedin.com/posts/danielleallen-nuclear_in-the-most-civil-manner-possible-could-activity-7438758963921248256-o8EE
🎙️ About Naked Nuclear
Naked Nuclear breaks down complex nuclear energy topics into clear, honest conversations — helping listeners understand not just the technology, but the systems and decisions shaping our energy future.
Further Reading (Direct Links)
Grid Inertia (the thing nobody explains well)
- IEEE Smart Grid (your reference):
https://smartgrid.ieee.org/bulletins/november-2020/brief-understanding-of-inertia-in-the-smart-grid-its-challenges-and-solutions
Grid Reliability & Clean Energy Systems
- International Energy Agency – Net Zero by 2050
https://www.iea.org/reports/net-zero-by-2050 - International Energy Agency – Electricity Market Reporthttps://www.iea.org/reports/electricity-market-report
Capacity Factors & Real-World Grid Data
- U.S. Energy Information Administration – Capacity Factors Explained
https://www.eia.gov/todayinenergy/detail.php?id=10191 - U.S. Energy Information Administration – Electricity Data Browser
https://www.eia.gov/electricity/data/browser/
System Costs & “Last 10% Problem”
- OECD Nuclear Energy Agency – The Full Costs of Electricity Provisionhttps://www.oecd-nea.org/jcms/pl_51110/the-full-costs-of-electricity-provision
- OECD Nuclear Energy Agency – System Costs in Decarbonised Power Systemshttps://www.oecd-nea.org/jcms/pl_15000/system-costs-of-electricity
Batteries & Energy Storage
- International Energy Agency – Energy Storage Tracking
https://www.iea.org/reports/energy-storage
Nuclear Performance
- World Nuclear Association – Nuclear Power Performancehttps://world-nuclear.org/information-library/current-and-future-generation/nuclear-power-in-the-world-today.aspx