Designing Resilient Energy Infrastructure: Implementing Energy API in Smart City Developments

Introduction

As cities evolve into smart ecosystems, the demand for reliable and real-time energy data has never been more critical. Developers, data engineers, and energy traders face significant challenges when trying to access wholesale energy market data. Traditional methods often involve scraping government portals or stitching together incompatible data formats, which can be time-consuming and error-prone. This is where Energy API comes into play, offering a unified solution that aggregates data from multiple trusted sources into a single, easy-to-use REST API.

In this blog post, we will explore how to design resilient energy infrastructure by implementing the Energy API in smart city developments. We will discuss the unique features of the Energy API, provide a quick start guide, delve into core endpoints, and present real-world use cases that demonstrate the API's capabilities. By the end of this post, you will understand how to leverage the Energy API to streamline your energy data needs and enhance your smart city projects.

Why Energy API

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

• Unified Data Source: Instead of dealing with multiple data providers like OMIE, ENTSO-E, and EIA, the Energy API offers a single normalized REST surface. 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—electricity, natural gas, crude oil, coal, carbon allowances, and grid carbon intensity—the Energy API provides extensive market coverage. This allows developers to query multiple commodities in a single API call, saving time and reducing complexity.
• Rapid Development: The Energy API features 16 endpoints that cover everything from spot prices to historical series and fluctuation analysis. This means developers can ship features in hours rather than weeks of ETL work, significantly accelerating the development cycle.
• Trusted Data Providers: The API aggregates data from reputable sources such as OMIE, ENTSO-E, EIA, and FRED, ensuring that users receive accurate and reliable information. This trust is crucial for developers building applications that rely on real-time energy data.

Quick Start

Getting started with the Energy API is straightforward. The base URL for all API requests is:

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

To make your first request, you will need to include the 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. The currencies object specifies the currency for each rate, providing clarity for developers working with multiple currencies.

Core Endpoints

1. GET /latest

This endpoint retrieves the most recent price for one or more symbols. It is essential for applications that require real-time pricing data.

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"
}
}

The rates object provides the latest prices for each symbol, while the dates object indicates when the prices were last updated.

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"

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"
}
}

This response provides historical pricing data, which is 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"

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"
}
}

This response provides a time series of prices, allowing developers to visualize trends over time.

4. GET /fluctuation

This endpoint calculates the 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,TTF_GAS" \
--data-urlencode "api_key=YOUR_API_KEY"

Expected JSON 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 inform trading strategies and risk management.

Real-World Use Cases

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

2. ESG Dashboard

With growing interest in sustainability, developers can create an ESG dashboard that visualizes carbon intensity and emissions data. By leveraging the /carbon-intensity and /emissions/latest endpoints, users can track their carbon footprint and make informed decisions about energy consumption.

3. Cost Calculator

Utilities and businesses can implement a cost calculator that estimates monthly energy expenses based on current market prices. By utilizing the /cost-estimate endpoint, developers can provide users with a simple interface to input their energy usage and receive accurate cost estimates.

FAQ

How often does the TTF gas price update?

The TTF gas price updates daily, reflecting the most recent market conditions. Users can retrieve the latest price using the /latest endpoint.

Can I get historical energy prices going back 5 years?

Yes, the Energy API allows users to access historical prices for various symbols. The /historical and /timeseries endpoints can be used to retrieve data for specific past dates or ranges.

Does the API support multiple currencies?

Absolutely! The Energy API supports multiple currencies, allowing users to specify their preferred currency when making requests. The response will include the currency for each rate, ensuring clarity in financial applications.

Conclusion

In conclusion, the Energy API is a powerful tool for developers looking to build applications that require reliable and real-time energy market data. By providing a unified interface to access diverse data sources, the API eliminates the complexities associated with traditional data retrieval methods. Whether you are building a price alert system, an ESG dashboard, or a cost calculator, the Energy API offers the features and capabilities needed to succeed.

Don't let the challenges of energy data hold you back. Try Energy API for free today and unlock the potential of your smart city projects!