Enhancing Energy Efficiency Programs with Energy API: Insights for Utilities and ESG Teams

Introduction

In today's fast-paced energy market, utilities and ESG teams face significant challenges in accessing reliable and timely market data. The traditional methods of scraping government portals or stitching together disparate data sources can be cumbersome, error-prone, and time-consuming. This is where Energy API comes into play, offering a unified REST API that aggregates wholesale energy market data from trusted sources. By leveraging this API, developers and data engineers can streamline their workflows, enhance their applications, and make informed decisions based on accurate data.

Energy API provides a comprehensive solution that normalizes data from various sources such as OMIE, ENTSO-E, EIA/FRED, and Ember into a single JSON interface. This not only simplifies the data retrieval process but also ensures that users have access to consistent and reliable information across multiple energy commodities. In this blog post, we will explore the key features of Energy API, provide a quick start guide, delve into core endpoints, and discuss real-world use cases that demonstrate the value of this powerful tool.

Why Energy API

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

• One Unified Interface: Instead of dealing with multiple APIs, each with different formats and schedules, Energy API offers a single normalized REST surface. This means developers can access data for electricity, natural gas, crude oil, coal, carbon allowances, and grid carbon intensity through one consistent interface, significantly reducing development time.
• Comprehensive Data Coverage: With over 39 symbols across six commodity categories, Energy API provides extensive market data. This breadth of coverage allows developers to build applications that require diverse energy data without the hassle of integrating multiple sources.
• Rapid Development: The API features 16 endpoints that cover a wide range of functionalities, including spot prices, historical series, intraday curves, and cost estimates. This allows developers to ship features in hours rather than weeks, accelerating the time to market for energy-related applications.
• Trusted Data Providers: Energy API aggregates data from reputable sources such as OMIE, ENTSO-E, and EIA, ensuring that users receive accurate and reliable information. This trust in data quality is crucial for making informed decisions in the energy sector.

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 "rates" provides the latest prices for the requested symbols. The "dates" field shows the date of the reported prices, and "currencies" specifies the currency for each symbol.

Core Endpoints

Energy API offers a variety of endpoints that cater to different data needs. Below are some of the core endpoints relevant to energy data retrieval:

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" field provides the latest prices for the requested symbols, while "currencies" indicates the currency for each price.

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

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 insights into price fluctuations, which can be crucial for traders and analysts looking to understand market dynamics.

Real-World Use Cases

Energy API can be utilized 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 using the /latest endpoint, the application can continuously monitor prices and send alerts via email or SMS when specific conditions are met.
• ESG Dashboard: ESG teams can create dashboards that visualize carbon intensity and emissions data. By leveraging the /carbon-intensity and /emissions/latest endpoints, teams can track their sustainability goals and report on their progress effectively.
• Cost Calculator: A cost calculator can be developed to estimate monthly energy expenses based on current market prices. By utilizing the /cost-estimate endpoint, users can input their expected energy consumption and receive an estimate of their costs 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 data available from the EEX. This ensures that users have access to the latest pricing information for their analyses and decision-making.

Can I get historical energy prices going back 5 years?

Yes, Energy API provides historical data for various symbols, allowing users to access prices going back several years. This is particularly useful for trend analysis and forecasting.

Does the API support multiple currencies?

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

Conclusion

In conclusion, Energy API is a powerful tool that addresses the challenges faced by utilities and ESG teams in accessing reliable energy market data. By providing a unified interface, comprehensive data coverage, and rapid development capabilities, Energy API enables developers to build robust applications that drive efficiency and informed decision-making.

Whether you are looking to create a price alert system, an ESG dashboard, or a cost calculator, Energy API offers the endpoints and data you need to succeed. Don't let the complexities of energy data hold you back—leverage the power of Energy API to streamline your workflows and enhance your applications.

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