Shift EV charging, laundry and dishwasher runs to the cleanest grid hours
Intermediate14h1–2
Electricity Maps APINext.jsCharts
17/20Carbon-Aware CI Scheduler
Delay non-urgent CI jobs to cleaner grid hours automatically.
Intermediate14h1–2 people17/20 fit
Build Carbon-Aware CI Scheduler for engineering teams in ~14h with 1–2 people. Stack: GitHub API + Electricity Maps API + Node.js.
Why it wins: Devtools meets climate in a practical way.
Build flow
01 · Problem
Nightly builds and test suites run whenever, regardless of grid carbon intensity.
02 · Solution
A GitHub Action checks carbon intensity, defers non-urgent jobs to a greener window within a deadline and reports CO2 avoided.
03 · Build
- 1Write the action
- 2Query carbon intensity
- 3Schedule within a window
- 4Post a report
04 · Demo
Show a workflow run deferred by two hours and the savings report.
MVP checklist
- Carbon check step
- Deadline-aware deferral
- Savings report
- Repo badge
Tech stack
| Tech | Role | |
|---|---|---|
| GitHub API | Repo + PR data | API |
| Electricity Maps API | Grid carbon intensity | API |
| Node.js | Backend runtime | Backend |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
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