Your LLM usage
LLM queries per month
Main model
Where it runs
Fine-tune
Electricity grid
gCO₂e per kWh
LEWI score
Example
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Estimate, not an audit. Real energy per query depends on hardware, batching and prompt length.
–kWh wasted per year
–t CO₂e per year
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LEWI · LLM Energy Waste Index
Where the energy is wasted
The share of LLM energy spent above what each query needs.
Oversized
A smaller model would do.
Idle
GPUs on, no traffic.
Repeated
Could be cached.
Green-SLM
How we cut it: the Green-SLM loop
1
Audit
Compute LEWI on the firm’s own LLM logs.
2
Diagnose
Split the waste: oversized, idle, repeated.
3
Fix
Gated compact model; cache; idle GPUs off.
4
Verify
Re-measure LEWI; report CO₂e saved.
Continuous and per firm: every business asks different questions, so new logs retrain the compact model and re-run the audit.
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