Creating Energy API-Driven Solutions for Virtual Power Plants: A Developer's Guide

In the rapidly evolving energy sector, developers face significant challenges when it comes to accessing reliable market data. Traditional methods often involve scraping government portals or stitching together incompatible formats, which can be time-consuming and error-prone. This blog post aims to address these challenges by introducing Energy API, a REST API that aggregates wholesale energy market data from trusted sources and normalizes it into a unified JSON interface. By leveraging this API, developers can streamline their processes and focus on building innovative solutions for virtual power plants.

With Energy API, developers can access a wide range of data, including electricity, natural gas, crude oil, coal, carbon allowances, and grid carbon intensity. This comprehensive data set empowers developers, data engineers, energy traders, fintech teams, utilities, and ESG/sustainability product teams to make informed decisions without the hassle of dealing with disparate data 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: Energy API replaces multiple data sources like OMIE, ENTSO-E, and EIA with a single, normalized REST interface. This means developers can access diverse energy market data without worrying about different formats, schedules, or naming conventions.
Comprehensive Coverage: With over 39 symbols across six commodity categories, Energy API provides extensive market data. Developers can query for electricity, gas, oil, coal, carbon, and carbon intensity in one API call, saving time and reducing complexity.
Rapid Development: The API's consistent JSON schema allows developers to ship features in hours rather than weeks. This accelerates the development cycle and enables teams to respond quickly to market changes.
Trusted Data Providers: Energy API aggregates data from reputable sources such as OMIE, ENTSO-E, EIA, FRED, and ESIOS, ensuring that users receive accurate and reliable information.

Quick Start

To get started with Energy API, you need to know the base URL and how to make your first request. The base URL for the API is:

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

Authentication is done via the api_key query parameter. Here’s how to make your first request to get the latest prices for a few symbols:

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"

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,
"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 success field indicates whether the request was successful. The rates object contains the latest prices for the requested symbols, while the dates and currencies objects provide additional context for each symbol.

Core Endpoints

Energy API offers a variety of endpoints that cater to different data needs. Here are four core endpoints relevant to developers working with energy data:

1. GET /latest

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

Key Params: symbols (required), base (optional currency filter), 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 each symbol, while the date field indicates when the data was retrieved.

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, allowing developers to analyze trends over time.

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"
}
}

The rates object contains historical prices keyed by date, making it easy to visualize trends over the specified period.

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 movements, which can inform trading strategies and risk management.

Real-World Use Cases

Energy API can be leveraged in various ways to create impactful solutions. Here are three concrete examples:

1. 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 system can continuously monitor prices and send alerts via email or SMS when conditions are met.

2. ESG Dashboard

With growing interest in sustainability, developers can create an ESG dashboard that visualizes carbon intensity data. By utilizing the /carbon-intensity endpoint, teams can track emissions and display trends over time, helping organizations meet their sustainability goals.

3. 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 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 ranges, enabling comprehensive analysis.

Does the API support multiple currencies?

Absolutely! Energy API supports multiple currencies, allowing developers to specify a base currency for their requests. This flexibility ensures that users can work with data in their preferred currency.

Conclusion

In conclusion, Energy API provides a powerful solution for developers looking to access reliable energy market data without the complexities of traditional methods. By offering a unified REST interface, comprehensive coverage, and rapid development capabilities, Energy API empowers teams to build innovative solutions for virtual power plants and beyond.

Whether you're developing a price alert system, an ESG dashboard, or a cost calculator, Energy API can significantly enhance your projects. Don't let the challenges of data access hold you back—leverage the capabilities of Energy API to streamline your development process and deliver impactful solutions.

Ready to get started? Try Energy API for free today and experience the benefits of seamless energy data integration!