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Solid-State Battery Demonstrations: When Do They Overtake Lithium-Ion?
Using the Samsung SDI–BMW–Solid Power demonstration, this compares the conditions and boundary conditions under which solid-state batteries gain the edge over lithium-ion.
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Renewable Energy Direct Subsidies vs Auctions: Which Wins Under What Conditions?
An electrical engineer’s comparison of where direct renewable subsidies and auctions each fit, drawn by the number of developers and grid hosting capacity.
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National 200 m Cap on Solar Setbacks: When Do Developers Gain Over Local Ordinances?
Korea has fixed a 200m national cap on solar setback distances (effective 2026-09-18). An electrical engineer’s view of when it actually favors developers over existing local ordinances.
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US ESS Battery Tariff at 25%: Is Now the Right Time for Korean Cell Makers to Localize Production?
With the US tariff on Chinese ESS batteries raised from 7.5% to 25%, we compare the timing of US local production for Korean cell makers from the standpoint of cost and policy volatility.
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Why the EU Is Teaming Up with Korea’s Big Three Battery Makers, and Why the IAA Is the Variable
The EU is deepening cooperation with LG Energy Solution, SK On and Samsung SDI to curb China’s battery dominance. A comparison of how the market splits along LFP, ESS and European production bases.
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CATL’s Additional Hungary Investment Controversy and the EU Battery Supply Chain Dilemma
CATL’s disputed additional investment in Debrecen, Hungary, shows that meeting EU supply chain rules and securing local acceptance are separate conditions.
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AI Data Center Power: Which Gains the Advantage, ESS, LNG or SMR? The 66-Hour Criterion
In choosing AI data center power, the first axis that splits the options is time, not unit cost. Last year the combined solar and wind capacity factor stayed below 15% for 66 hours, a stretch a 6–8-hour ESS cannot cover.
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Pumped Hydro vs Battery ESS — Long-Duration Storage Is Decided by the Cost of Adding Hours, Not Efficiency
What separates pumped hydro from battery ESS is the marginal cost of extra discharge hours, not round-trip efficiency. Head calculations and duration-based criteria.
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Silicon Anode vs Graphite Anode — When Does Silicon Take Over, from an ESS/EV Battery Design Perspective
Silicon Anode is advantageous in new cell lines where energy density is the top design priority — high-density battery packs, lightweight EVs, and drones. Conversely, for large-scale stationary ESS sites where proven cycle life and low cell cost take priority, Graphite Anode remains the rational choice as of August 2026.
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Choosing an Energy Source by Storage Duration
Even for the same “1 kWh of storage capacity,” secondary batteries, hydrogen, and pumped hydro have completely different cost structures. Viewed through the lens of storage duration, which option wins becomes clear.