Empowering Energy Startups: How to Build Innovative Applications Using Energy API

Introduction

In the rapidly evolving energy sector, startups and established companies alike face the daunting challenge of accessing reliable and timely market data. The energy market is characterized by its complexity, with various commodities such as electricity, natural gas, crude oil, coal, and carbon allowances each governed by different data sources, formats, and schedules. This fragmentation makes it difficult for developers and data engineers to build applications that require accurate and up-to-date information without resorting to tedious scraping of government portals or stitching together incompatible data formats.

This is where Energy API comes into play. By providing a unified REST API that aggregates wholesale energy market data from trusted sources like OMIE, ENTSO-E, EIA, and Ember, Energy API simplifies the process of accessing critical market information. In this blog post, we will explore how developers can leverage Energy API to build innovative applications that empower energy startups, streamline operations, and enhance decision-making processes.

Why Energy API

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

• Unified Data Access: With Energy API, developers can access a single normalized REST surface that replaces multiple disparate sources, each with its own unique formats and naming conventions. This means less time spent on data wrangling and more time focused on building features that matter.
• Comprehensive Coverage: Energy API offers over 39 symbols across six commodity categories, including electricity, gas, oil, coal, carbon, and carbon intensity. This extensive coverage allows developers to query multiple commodities in a single API call, streamlining the data retrieval process.
• Rapid Development: The API features 16 endpoints that cover a wide range of functionalities, from spot prices and historical series to fluctuation analysis and provider status. This breadth of features enables developers to ship applications in hours rather than weeks, significantly reducing time-to-market.
• Trusted Data Providers: Energy API aggregates data from reputable sources such as OMIE, ENTSO-E, EIA, and FRED, ensuring that the information developers rely on is accurate and trustworthy. This reliability is crucial for applications that require real-time decision-making based on market conditions.

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 key fields include:

• success: Indicates whether the API call was successful.
• date: The date for which the data is relevant.
• base: The base currency used 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 provides a variety of endpoints that cater to different data needs. Below are some of the core endpoints that developers will find particularly useful:

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"

Example 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"
}
}

In this response, the rates object provides the latest prices for Brent Crude, TTF Gas, and EUA CO2, allowing developers to quickly access key market data.

2. GET /historical

This endpoint allows users to retrieve 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"

Example 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"
}
}

The rates object here provides historical prices, which can be crucial for trend analysis and reporting.

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"

Example 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 detailed view of historical prices over the specified date range, allowing developers to visualize trends and make informed decisions.

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=2025-03-31" \
--data-urlencode "symbols=BRENT_CRUDE,TTF_GAS" \
--data-urlencode "api_key=YOUR_API_KEY"

Example Response:

{
"success": true,
"fluctuations": {
"BRENT_CRUDE": {
"start_value": 76.30,
"end_value": 75.90,
"change": -0.40,
"change_pct": -0.52
},
"TTF_GAS": {
"start_value": 46.80,
"end_value": 47.10,
"change": 0.30,
"change_pct": 0.64
}
}
}

This response provides valuable insights into price movements, which can be critical for traders and analysts looking to understand market dynamics.

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 the price of a specific commodity reaches 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.

2. ESG Dashboard

With the growing emphasis on sustainability, developers can build an ESG (Environmental, Social, and Governance) dashboard that visualizes carbon intensity data. By utilizing the /carbon-intensity endpoint, the dashboard can provide real-time insights into the carbon footprint of energy consumption, helping organizations track their sustainability goals.

3. Cost Calculator

A cost calculator application can help businesses estimate their monthly energy expenses based on current market prices. By using the /cost-estimate endpoint, developers can input their expected energy usage and receive an estimate of their costs, enabling better budgeting and financial planning.

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 users to access historical prices for various commodities. The /historical and /timeseries endpoints can be used to retrieve data for specific past dates or over a range of dates, respectively.

Does the API support multiple currencies?

Yes, Energy API supports multiple currencies. When making requests, developers can specify the base currency, and the API will return prices in the requested currency, making it easier to integrate into applications that operate in different financial contexts.

Conclusion

In conclusion, Energy API is a powerful tool for developers looking to build innovative applications in the energy sector. By providing a unified interface to access reliable market data, Energy API eliminates the pain of dealing with disparate data sources and formats. Whether you are building a price alert system, an ESG dashboard, or a cost calculator, Energy API offers the features and capabilities you need to succeed.

Don't let the complexities of energy data hold you back. Start leveraging the power of Energy API today and unlock new opportunities for your applications. Try Energy API for free and experience the difference for yourself!