The rise of batteries in six charts

Stationary storage and grid use

• Strong interest in rapid growth of grid-scale “stationary” batteries, especially for replacing gas peaker plants and smoothing solar “duck curves.”
• Tesla Megapacks and similar systems are cited as already handling a noticeable fraction of California peak power, though typically for only a few hours.
• Some argue multi-day or seasonal storage “will never be a thing” with current tech; others think modest multi‑day storage is practical, but not months.

Battery chemistries, toxicity, and alternatives

• Concerns raised about toxicity, recycling difficulty, and resource constraints of high‑capacity lithium chemistries.
• Counterpoints emphasize less toxic chemistries (e.g., sodium‑ion, iron-based, LFP), saltwater batteries, and flow batteries for grid use, though many alternatives have struggled commercially.
• Gravity storage (pumped hydro, mines) and nuclear are proposed by some as superior for large‑scale or long‑duration needs; others criticize their low energy density or economics.

Short‑ vs long‑term storage and hydrogen

• “Long term” in industry use is said to mean >8 hours; others use “long term” to mean weeks or seasons.
• Hydrogen is discussed as a candidate for seasonal storage and aviation fuel, but low round‑trip efficiency, storage challenges, and current reliance on fossil feedstocks are highlighted.

Energy density vs fossil fuels; hard sectors

• Multiple comments compare batteries (0.5 kWh/kg top-end) to diesel/jet fuel (10–13 kWh/kg), stressing that combustion engines waste most of that energy.
• Consensus: batteries work well for cars, buses, many trains, and some short‑range aircraft and boats; long‑haul aviation likely needs synthetic or hydrogen‑based fuels.

Materials supply, recycling, and growth limits

• Some fear an “OPEC for batteries” and mining limits; others note lithium’s abundance, emerging sodium/iron chemistries, and recyclability.
• There’s disagreement on how quickly recycling and new deposits can scale and on how serious near‑term lithium/nickel price crashes are.

Solar policy, rooftop vs utility‑scale, and T&D

• California policy changes (lower rooftop reimbursement) drastically reduced rooftop applications, underscoring policy sensitivity.
• Debate over rooftop vs utility solar: utility is cheaper per kWh, but transmission/distribution (T&D) costs and grid constraints may favor more local generation in some models.
• Equity concern: rooftop incentives tend to benefit wealthier homeowners.

Lifecycle emissions and fossil‑charged batteries

• Skeptics ask how much fossil energy is used to make and charge batteries; others cite lifecycle studies (within the thread) claiming EVs and battery‑backed renewables already beat fossil fuels over full lifetimes.
• Some argue such questions are repeatedly answered and now mostly used in bad faith; others insist trade‑offs are under‑discussed.

EV economics, infrastructure, and V2G

• Falling pack prices (especially LFP) are seen as pushing EVs toward cost parity, though cheap consumer batteries and tools lag.
• Charging access for renters and dense cities is a major unresolved barrier; proposed solutions include curbside/lamppost chargers and managed charging.
• Vehicle‑to‑grid/home is viewed as a likely near‑future tool for grid stability.

High‑density cells and chart skepticism

• Several question charts showing 500 Wh/kg in commercial use; they note such densities are currently limited to prototypes or niche aerospace cells.
• Calls for log scales and clearer S‑curve context; skepticism about over‑optimistic arrows “to the sky” without bounds.

Transition pace and role of nuclear

• Many see an “electricity revolution” already undermining coal and, eventually, gas; others stress that fossil fuels still dominate global primary energy.
• Some argue renewables plus storage are already cheaper than new nuclear and getting cheaper, while nuclear costs rise; others continue to champion nuclear for firm, high‑density power.