Designing Customer-Centric Energy Products: Best Practices with Energy API

Introduction

In today's fast-paced energy market, developers and data engineers face significant challenges when it comes to accessing reliable and timely market data. The energy sector is characterized by a multitude of data sources, each with its own unique formats, schedules, and naming conventions. This fragmentation makes it difficult for developers to build applications that require accurate and up-to-date information on electricity, natural gas, crude oil, coal, carbon allowances, and grid carbon intensity. Without a unified solution, teams often resort to scraping government portals or stitching together incompatible formats, leading to wasted time and resources.

This blog post aims to address these challenges by introducing Energy API, a 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 unified JSON interface, Energy API empowers developers to access the information they need without the hassle of dealing with disparate data sources. In this post, we will explore best practices for designing customer-centric energy products using Energy API, highlighting its key features, endpoints, and real-world use cases.

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 normalized REST interface. This eliminates the need to manage different formats and schedules, allowing teams to focus on building their applications rather than dealing with data integration issues.
• Comprehensive Coverage: Energy API offers over 39 symbols across six commodity categories, including electricity, natural gas, crude oil, coal, carbon allowances, and carbon intensity. This extensive coverage ensures that developers have access to a wide range of data points necessary for their applications.
• Rapid Development: The API provides 16 endpoints covering various aspects of energy data, such as spot prices, historical series, and forecasts. This allows developers to ship features in hours rather than weeks, significantly accelerating the development process.
• Trusted Data Providers: Energy API aggregates data from reputable sources, ensuring that users receive accurate and reliable information. This trustworthiness is crucial for applications that rely on precise market data.

Quick Start

Getting started with Energy API is straightforward. 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 success field indicates whether the request was successful, while the rates object contains the latest prices for the requested symbols.

Core Endpoints

Energy API provides a variety of endpoints that cater to different data needs. Here are four key endpoints relevant to energy data:

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"

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"
}
}

The rates object provides the latest prices for the requested symbols, while the dates object indicates the date of the prices.

2. GET /historical

This endpoint retrieves 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"
}
}

This response provides historical prices for the specified date, allowing developers to analyze past market trends.

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"

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"
}
}

This response provides a time series of prices for the specified symbols, allowing developers to visualize 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"

JSON Response:

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

This response provides valuable insights into price fluctuations over the specified period, which can be crucial for trading strategies.

Real-World Use Cases

Energy API can be leveraged in various applications across the energy sector. 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 utilizing the /latest endpoint, the application can continuously monitor prices and send alerts via email or SMS when conditions are met.
• ESG Dashboard: An ESG (Environmental, Social, and Governance) dashboard can be created to visualize carbon intensity and emissions data. By using the /carbon-intensity and /emissions/latest endpoints, developers can provide real-time insights into a company's carbon footprint and compliance with sustainability goals.
• Cost Calculator: A cost calculator can help businesses estimate their monthly energy expenses based on current market prices. By using the /cost-estimate endpoint, developers can create a tool that allows users to input their expected energy consumption 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 allows you to access historical prices for various symbols. By using the /historical and /timeseries endpoints, developers can retrieve data for specific past dates or over a range of dates, providing insights into long-term trends.

Does the API support multiple currencies?

Yes, Energy API supports multiple currencies. When making requests, developers can specify the base parameter to filter results by currency, ensuring that they receive data in the desired format.

Conclusion

In conclusion, Energy API offers a powerful solution for developers seeking reliable and comprehensive energy market data. By providing a unified REST interface that aggregates data from trusted sources, Energy API simplifies the process of accessing and utilizing energy data. With its extensive coverage, rapid development capabilities, and real-world use cases, Energy API is the fastest path from zero to production energy data.

Whether you are building a price alert system, an ESG dashboard, or a cost calculator, Energy API equips you with the tools you need to succeed in the energy market. Don't waste time scraping government portals or stitching together incompatible formats—leverage the power of Energy API to streamline your development process.

Ready to get started? Try Energy API for free today and unlock the potential of energy data for your applications!