Empowering Utilities with Energy API: Designing Apps for Citizen Engagement and Feedback

Introduction

In today's fast-paced energy market, access to reliable and timely data is crucial for utilities, energy traders, and sustainability teams. The challenge lies in the fragmented nature of energy data sources, which often require developers to scrape multiple government portals or stitch together incompatible formats. This not only consumes valuable time but also introduces the risk of errors and inconsistencies in the data. The need for a unified solution that aggregates wholesale energy market data has never been more pressing.

Enter Energy API, a powerful REST API that consolidates data from trusted sources like OMIE, ENTSO-E, EIA, and more into a single, normalized JSON interface. With Energy API, developers can access a wealth of information across various commodities, including electricity, natural gas, crude oil, coal, carbon allowances, and grid carbon intensity, all without the hassle of dealing with disparate data formats. This blog post will explore how Energy API empowers utilities and developers to create applications that enhance citizen engagement and feedback.

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 endpoint. This eliminates the need to manage different formats, schedules, and naming conventions, allowing teams to focus on building applications rather than data integration.
• Comprehensive Coverage: The API offers over 39 symbols across six commodity categories, ensuring that developers have access to a wide range of data points. This comprehensive coverage enables the creation of robust applications that can analyze trends and provide insights across various energy markets.
• Rapid Development: The consistent JSON schema across all commodities means that developers can ship features in hours, not weeks. This accelerates the development cycle and allows teams to respond quickly to market changes.
• Trusted Data Providers: Energy API aggregates data from reputable sources, ensuring that the information is accurate and reliable. This trustworthiness is essential for applications that rely on real-time data for decision-making.

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 the api_key as a query parameter. Here’s an example of how to fetch 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

1. GET /latest

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

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 requested, along with their respective currencies.

2. GET /historical

This endpoint allows users to retrieve prices for all symbols on a specific past date. It is particularly useful for historical analysis and reporting.

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"
}
}

The response includes the rates object, which contains the prices for the specified symbols on the given date.

3. GET /timeseries

This endpoint provides 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"
}
}

The rates object contains historical prices keyed by date, allowing for easy analysis of trends over time.

4. GET /fluctuation

This endpoint provides start and end values, absolute change, and percentage change over a specified period, which is valuable for performance analysis.

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 a clear overview of the price fluctuation for the specified symbol, including the percentage change, which is crucial for traders and analysts.

Real-World Use Cases

Energy API can be leveraged in various applications to enhance citizen engagement and feedback. Here are three concrete examples:

• Price Alert System: Developers can build a price alert system that notifies users when the price of a specific commodity, such as TTF Gas, reaches a certain threshold. This can be achieved using the /latest endpoint to fetch real-time prices and trigger alerts based on user-defined criteria.
• ESG Dashboard: Sustainability teams can create dashboards that visualize carbon intensity data and emissions trading prices. By utilizing the /carbon-intensity and /emissions/latest endpoints, teams can provide stakeholders with insights into their carbon footprint and compliance with regulations.
• Cost Calculator: Utilities can develop cost calculators that estimate monthly electricity costs based on the latest prices. By using the /cost-estimate endpoint, developers can provide users with accurate estimates tailored to their consumption patterns.

FAQ

How often does the TTF gas price update?

The TTF gas price updates daily, reflecting the most recent market conditions. This ensures that users have access to the latest pricing information for informed decision-making.

Can I get historical energy prices going back 5 years?

Yes, Energy API allows users to retrieve historical prices for various symbols, enabling analysis of trends and patterns over extended periods. The /historical and /timeseries endpoints can be used for this purpose.

Does the API support multiple currencies?

Absolutely! Energy API supports multiple currencies, allowing users to specify their preferred currency when making requests. This flexibility is essential for applications that operate in different regions or markets.

Conclusion

In a world where energy data is fragmented and often difficult to access, Energy API provides a unified solution that empowers developers to create innovative applications for citizen engagement and feedback. By offering a comprehensive set of endpoints and reliable data from trusted sources, Energy API enables teams to focus on building impactful solutions rather than wrestling with data integration challenges.

Whether you are building a price alert system, an ESG dashboard, or a cost calculator, Energy API is the fastest path from zero to production energy data. Start exploring the possibilities today and try Energy API for free to see how it can transform your energy data experience.