# WattTime

**Canonical:** https://apis.io/providers/watttime/  
**Website:** https://watttime.org/  
**APIs profiled:** 6

WattTime is a nonprofit organization that provides real-time, forecast, and historical data for electric grids around the world, enabling carbon-aware computing and clean energy procurement decisions. The WattTime API delivers marginal emissions data (CO2 MOER), health damage signals, average emissions rates, and renewable energy forecasts for 342 grid regions across 210 countries and territories. Developers and organizations use the API to schedule workloads during low-carbon windows, measure actual emissions reductions from clean energy procurement, and meet sustainability reporting requirements.

## Kin Score — 35.2 / 100 (thin)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.4 from 34.8).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 30.2 |
| Governance | 28.8 |
| Contract Governance | 28.8 |
| Operational Transparency | 42.1 |
| Developer Ergonomics | 42.9 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

Regulatory layer — **Energy & Utilities**: 23.0 (matched via tags).

## Agent readiness — 41.9 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (6)

- **WattTime Python Client** — Official Python SDK for the WattTime API providing simplified access to real-time, forecast, and historical emissions data.
- **WattTime Account API** — Account information and access management.
- **WattTime Authentication API** — Register for an account and obtain access tokens.
- **WattTime Emissions Data API** — Access real-time, historical, and forecast marginal emissions signals for electric grids.
- **WattTime Forecasts API** — Retrieve emissions forecasts and historical forecast data.
- **WattTime Grid Regions API** — Discover and query grid balancing authorities and regions.

## Agentic access (1)

- **Watttime Agentic Access** — 9 operations · 1 acting

## Security (2)

- **Watttime Authentication** — http · 2 schemes
- **Watttime Domain Security** — TLSv1.3

## Plans (1)

- **Watttime Plans Pricing**

## Use cases (5)

- **Carbon-Aware Computing** — Technology companies and cloud providers schedule compute workloads, data transfers, and batch jobs to run during periods of low marginal carbon intensity.
- **Clean Energy Procurement** — Organizations measure the actual emissions reductions from renewable energy procurement and power purchase agreements using marginal emissions data.
- **Sustainability Reporting** — Enterprises report Scope 2 emissions more accurately using marginal emissions rates rather than average grid emission factors.
- **Smart Building Optimization** — Building energy management systems shift heating, cooling, and EV charging to low-emission grid windows to reduce carbon footprint.
- **Grid Research and Analysis** — Researchers, utilities, and policy makers analyze historical and forecast emissions data to study grid decarbonization trends.

## Tags

Emissions, Climate, Carbon, Energy, Electricity Grid, Sustainability, Clean Energy

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/watttime/). Scores are computed from the provider's own public artifacts under a published rubric.