Building a Sustainable Energy Marketplace: How Developers Can Create Applications with Energy API

Introduction

In today's rapidly evolving energy landscape, developers face significant challenges when it comes to accessing reliable and standardized market data. The energy sector is characterized by a plethora of data sources, each with its own unique formats, schedules, and naming conventions. This fragmentation makes it difficult for developers, data engineers, and energy traders to obtain the information they need without resorting to cumbersome web scraping or complex data integration processes. The result is wasted time, increased costs, and missed opportunities in a highly competitive market.

Fortunately, Energy API offers a solution that streamlines access to wholesale energy market data. By aggregating data from trusted sources such as OMIE, ENTSO-E, EIA, and others, Energy API provides a unified REST interface that simplifies the process of retrieving essential market information. In this blog post, we will explore how developers can leverage Energy API to build sustainable energy applications, enabling them to focus on innovation rather than data wrangling.

Why Energy API

Energy API stands out in the crowded field of energy data providers for several compelling reasons:

• **Unified Data Access**: With Energy API, developers can access data from multiple sources through a single, normalized REST interface. This eliminates the need to manage different formats and schedules, allowing developers to ship features in hours rather than weeks of ETL work.
• **Comprehensive Coverage**: Energy API supports over 39 symbols across six commodity categories, including electricity, natural gas, crude oil, coal, carbon allowances, and grid carbon intensity. This breadth of coverage ensures that developers can find the data they need for a wide range of applications.
• **Robust Endpoints**: The API offers 16 endpoints that cover everything from spot prices and historical series to intraday curves and fluctuation analysis. This variety allows developers to build sophisticated applications that can analyze market trends and make informed decisions.
• **Trusted Data Providers**: Energy API aggregates data from reputable sources, ensuring that developers can rely on the accuracy and timeliness of the information they receive. This trust is crucial for applications that require real-time data for trading or compliance purposes.

Quick Start

Getting started with Energy API is straightforward. The base URL for accessing 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 include:

• 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 rate is expressed.

Core Endpoints

Energy API provides a variety of endpoints that cater to different data needs. Below are some of the core endpoints relevant to developers building energy applications:

1. GET /latest

This endpoint retrieves the most recent prices 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"

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 provides the latest prices for each symbol requested, allowing developers to quickly access current market data.

2. GET /historical

This endpoint returns 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"

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 date field indicates the specific date for which the prices are retrieved, while the rates object provides the historical prices for the requested symbols.

3. GET /timeseries

This endpoint retrieves historical series between two dates, making it 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"

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, allowing developers to visualize trends over time.

4. GET /fluctuation

This endpoint provides start and 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"

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 crucial for traders looking to make informed decisions.

Real-World Use Cases

Developers can leverage Energy API to build a variety of applications that address real-world challenges in the energy sector. Here are three concrete examples:

1. Price Alert System

Developers can create a price alert system that notifies users when energy prices reach a certain threshold. By utilizing the /latest endpoint, the application can continuously monitor prices for specific commodities and send alerts via email or SMS when prices fluctuate beyond predefined limits.

2. ESG Dashboard

With increasing focus on sustainability, developers can build an ESG (Environmental, Social, and Governance) dashboard that visualizes carbon intensity and emissions data. By querying the /carbon-intensity and /emissions/latest endpoints, the dashboard can provide real-time insights into a company's carbon footprint and compliance with regulations.

3. Cost Calculator

Energy API can also be used to develop a cost calculator that estimates monthly electricity costs based on current market prices. By using the /cost-estimate endpoint, developers can input the latest price and expected usage to provide users with accurate cost projections.

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 allows developers to access historical prices for various commodities. The /historical and /timeseries endpoints can be used to retrieve data for specific past dates or ranges, making it easy to analyze trends over time.

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, allowing for seamless integration into applications that operate in different regions.

Conclusion

Building a sustainable energy marketplace requires access to reliable and standardized market data. Energy API provides developers with the tools they need to create innovative applications that can analyze, visualize, and act on energy market information. By leveraging the unified REST interface and comprehensive endpoints, developers can save time and resources while delivering valuable insights to their users.

Don't let fragmented data sources hold you back. Try Energy API for free today and discover how easy it is to integrate powerful energy market data into your applications. Start building the future of energy with confidence!