Watttime
Nonprofit providing real-time electricity grid emissions data for 200+ countries to help shift energy use to cleaner times
| What is it | Nonprofit providing real-time electricity grid emissions data for 200+ countries to help shift energy use to cleaner times |
|---|---|
| Pricing | Freemium |
| Free tier | Yes |
| Platform | Web Application |
| API | Yes |
| Works with | IFTTT |
| Best for | optimizing EV charging times to use cleaner power, siting new renewable projects for maximum emissions displacement |
| Domain registered | 2013 |
Data updated Aug. 1, 2026
What does Watttime do?
WattTime is a nonprofit that gathers and shares real-time and forecasted emissions data for electric power grids around the world. Instead of just telling you how much CO2 a grid produces on average, it gives you the marginal emissions rate — the carbon impact of using a little more electricity right now. That matters because the grid's cleanliness changes hour by hour depending on which power plants are running. The service covers over 200 countries and territories, making it one of the most comprehensive datasets of its kind.
The core offering is a set of data signals: marginal CO2, average CO2, and even health damage estimates from air pollution. These are available via an API, so developers and companies can build them into smart devices, energy management software, and sustainability dashboards. Partners like Google Nest use WattTime's signal to automatically shift EV charging or thermostat usage to cleaner grid moments. The site also explains three big levers for cutting emissions: timing your electricity use (load shifting), where you build new renewables, and which suppliers you buy from.
This is most useful for utilities, energy managers, EV fleet operators, and any company with serious sustainability targets. If you're building a product that controls when something draws power — like a thermostat, battery, or EV charger — WattTime gives you the data to make it greener without any extra hardware. Researchers and policy analysts will also find the methodology and validation pages helpful for understanding how the signals are calculated.
Key features
What makes it stand outWho is Watttime for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardBasic (free)
- Data access through the WattTime API
- Secure, token-based authentication
- All signals & endpoints for one region: CAISO_NORTH
- CO2 percentile, all regions
- Regions: Choose from global coverage of 200+ countries and territories (see map)
- Signals: Choose from CO2 and Human Health (see signals)
- Historical data: 2+ years of history
- General support
- Forecast data: 72-hour rolling, updated every 5 minutes
- Premium support, including SLA
Analyst
- Data access through the WattTime API
- Secure, token-based authentication
- All signals & endpoints for one region: CAISO_NORTH
- CO2 percentile, all regions
- Regions: Choose from global coverage of 200+ countries and territories (see map)
- Signals: Choose from CO2 and Human Health (see signals)
- Historical data: 2+ years of history
- General support
- Forecast data: 72-hour rolling, updated every 5 minutes
- Premium support, including SLA
Pro
- Data access through the WattTime API
- Secure, token-based authentication
- All signals & endpoints for one region: CAISO_NORTH
- CO2 percentile, all regions
- Regions: Choose from global coverage of 200+ countries and territories (see map)
- Signals: Choose from CO2 and Human Health (see signals)
- Historical data: 2+ years of history
- General support
- Forecast data: 72-hour rolling, updated every 5 minutes
- Premium support, including SLA
Trust & presence
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