Empowering Energy Data Sharing through Open APIs: A Guide for Developers and Utilities

Introduction

In today's fast-paced energy market, access to reliable and timely data is crucial for developers, energy traders, and utilities. The challenge lies in the fragmented nature of energy data sources, where each provider offers data in different formats, schedules, and naming conventions. This inconsistency complicates the process of data integration, leading to inefficiencies and increased development time. Developers often find themselves scraping government portals or stitching together incompatible formats, which can be both time-consuming and error-prone.

This blog post aims to address these challenges by introducing Energy API, a unified REST API that aggregates wholesale energy market data from trusted sources such as OMIE, ENTSO-E, ESIOS, EIA/FRED, and Ember. By normalizing this data into a single JSON interface, Energy API empowers developers to access reliable market data without the pain of dealing with multiple sources. In this guide, we will explore the key features of Energy API, provide a quick start guide, and discuss real-world use cases that demonstrate its value.

Why Energy API

Energy API stands out in the crowded landscape of energy data solutions for several reasons:

• Unified Data Access: With Energy API, developers can access data from multiple sources through a single endpoint. This eliminates the need to manage different APIs, formats, and schedules, allowing developers to focus on building their applications rather than dealing with data integration issues.
• Consistent JSON Schema: Energy API provides a consistent JSON schema across all commodities, which simplifies the development process. Developers can ship features in hours instead of weeks, as they do not need to spend time adapting to different data structures.
• Comprehensive Coverage: Energy API offers over 39 symbols across six commodity categories: electricity, natural gas, crude oil, coal, carbon allowances, and grid carbon intensity. This extensive coverage ensures that developers have access to the data they need for a wide range of applications.
• Real-Time and Historical Data: The API provides both real-time and historical data, enabling developers to build applications that require up-to-date information as well as those that analyze trends over time.

Quick Start

Getting started with Energy API is simple. The base URL for the API is:

https://energy-api.com/api/v1

To make your first request, you will need to include your API key as a query parameter. Here’s an example of how to retrieve the latest prices for Brent Crude and TTF Gas:

curl -G https://energy-api.com/api/v1/latest \
--data-urlencode "symbols=BRENT_CRUDE,TTF_GAS" \
--data-urlencode "api_key=YOUR_API_KEY"

The expected JSON response will look like this:

{
"success": true,
"date": "2026-06-11",
"base": "MIXED",
"rates": {
"BRENT_CRUDE": 74.82,
"TTF_GAS": 38.15
},
"dates": {
"BRENT_CRUDE": "2026-06-11",
"TTF_GAS": "2026-06-11"
},
"currencies": {
"BRENT_CRUDE": "USD",
"TTF_GAS": "EUR"
}
}

In this response, the key fields are:

• success: Indicates whether the request was successful.
• date: The date of the data retrieved.
• base: The base currency for the rates.
• rates: An object containing the latest prices for the requested symbols.
• currencies: The currency in which each symbol's price is quoted.

Core Endpoints

Energy API offers a variety of endpoints to access different types of data. Here are some of the core endpoints relevant to developers:

1. GET /latest

This endpoint retrieves the most recent price for one or more symbols.

Key Params: symbols (required), base (optional), category (optional)

curl -G https://energy-api.com/api/v1/latest \
--data-urlencode "symbols=BRENT_CRUDE,TTF_GAS,EUA_CO2" \
--data-urlencode "api_key=YOUR_API_KEY"

Expected JSON response:

{
"success": true,
"date": "2026-06-11",
"base": "MIXED",
"rates": {
"BRENT_CRUDE": 74.82,
"TTF_GAS": 38.15,
"EUA_CO2": 67.40
},
"dates": {
"BRENT_CRUDE": "2026-06-11",
"TTF_GAS": "2026-06-11",
"EUA_CO2": "2026-06-11"
},
"currencies": {
"BRENT_CRUDE": "USD",
"TTF_GAS": "EUR",
"EUA_CO2": "EUR"
}
}

Field Explanation: The "rates" object contains the latest prices for each requested symbol, allowing developers to quickly access current market data.

2. GET /historical

This endpoint provides prices for all symbols on a specific past date. If the date falls on a non-publishing day, it returns the most recent value before it.

Key Params: date (YYYY-MM-DD, required), symbols (required), base (optional)

curl -G https://energy-api.com/api/v1/historical \
--data-urlencode "date=2025-09-15" \
--data-urlencode "symbols=BRENT_CRUDE,TTF_GAS" \
--data-urlencode "api_key=YOUR_API_KEY"

Expected JSON response:

{
"success": true,
"date": "2025-09-15",
"base": "MIXED",
"rates": {
"BRENT_CRUDE": 71.45,
"TTF_GAS": 36.20
},
"currencies": {
"BRENT_CRUDE": "USD",
"TTF_GAS": "EUR"
}
}

Field Explanation: The "rates" object provides historical prices, which are essential for trend analysis and reporting.

3. GET /timeseries

This endpoint retrieves historical series between two dates, ideal for charting and trend analysis.

Key Params: start (required), end (required), symbols (required), base (optional)

curl -G https://energy-api.com/api/v1/timeseries \
--data-urlencode "start=2025-01-01" \
--data-urlencode "end=2025-03-31" \
--data-urlencode "symbols=BRENT_CRUDE,TTF_GAS" \
--data-urlencode "api_key=YOUR_API_KEY"

Expected JSON response:

{
"success": true,
"base": "MIXED",
"start_date": "2025-01-01",
"end_date": "2025-03-31",
"rates": {
"BRENT_CRUDE": {
"2025-01-02": 76.30,
"2025-01-03": 75.90
},
"TTF_GAS": {
"2025-01-02": 46.80,
"2025-01-03": 47.10
}
},
"frequencies": {
"BRENT_CRUDE": "daily",
"TTF_GAS": "daily"
},
"currencies": {
"BRENT_CRUDE": "USD",
"TTF_GAS": "EUR"
}
}

Field Explanation: The "rates" object contains historical prices keyed by date, which is useful for visualizing trends over time.

4. GET /fluctuation

This endpoint provides start/end values, absolute change, and percentage change over a specified period.

Key Params: start (required), end (required), symbols (required), base (optional)

curl -G https://energy-api.com/api/v1/fluctuation \
--data-urlencode "start=2025-01-01" \
--data-urlencode "end=2025-01-31" \
--data-urlencode "symbols=BRENT_CRUDE" \
--data-urlencode "api_key=YOUR_API_KEY"

Expected JSON response:

{
"success": true,
"fluctuation": {
"BRENT_CRUDE": {
"start_value": 76.30,
"end_value": 75.90,
"change": -0.40,
"change_pct": -0.52
}
}
}

Field Explanation: The "fluctuation" object provides insights into price changes over the specified period, which is valuable for traders and analysts.

Real-World Use Cases

Energy API can be leveraged in various applications to enhance decision-making and operational efficiency. Here are three concrete examples:

• Price Alert System: Developers can build a price alert system that notifies users when energy prices reach a certain threshold. By using the /latest endpoint, the application can continuously monitor prices and send alerts via email or SMS when conditions are met.
• ESG Dashboard: Utilities and fintech teams can create an Environmental, Social, and Governance (ESG) dashboard that visualizes carbon intensity and emissions data. By utilizing the /carbon-intensity and /emissions/latest endpoints, teams can track their sustainability goals and report on progress.
• Cost Calculator: A cost calculator can be developed to estimate monthly energy expenses based on current market prices. By using the /cost-estimate endpoint, developers can provide users with a simple interface to input their expected usage and receive an estimated cost based on the latest prices.

FAQ

How often does the TTF gas price update?

The TTF gas price updates daily, reflecting the most recent market conditions. Developers can use the /latest endpoint to retrieve the most current price at any time.

Can I get historical energy prices going back 5 years?

Yes, Energy API provides historical data for various symbols. Developers can use the /historical and /timeseries endpoints to access historical prices, allowing for analysis over extended periods.

Does the API support multiple currencies?

Yes, Energy API supports multiple currencies. Developers can specify the base currency in their requests, and the API will return prices in the requested currency, making it easier to integrate into applications with diverse user bases.

Conclusion

In conclusion, Energy API is a powerful tool for developers and energy professionals seeking reliable market data without the hassle of managing multiple sources. By providing a unified REST API with a consistent JSON schema, Energy API streamlines the process of accessing wholesale energy market data. Whether you are building a price alert system, an ESG dashboard, or a cost calculator, Energy API offers the flexibility and reliability needed to succeed in today's energy landscape.

Don't let fragmented data sources slow you down. Try Energy API for free today and experience the fastest path from zero to production energy data.