Utilizing Energy API for Enhanced Energy Efficiency Reporting: Best Practices for ESG Teams

Introduction

In today's rapidly evolving energy landscape, organizations are increasingly focused on enhancing their energy efficiency reporting, particularly in the context of Environmental, Social, and Governance (ESG) criteria. However, the challenge lies in accessing reliable and standardized energy market data. Many developers and data engineers find themselves grappling with the complexities of scraping data from various government portals or stitching together incompatible formats from multiple sources. This not only consumes valuable time but also introduces the risk of inaccuracies in reporting.

This blog post aims to address these challenges by introducing the Energy API, a powerful REST API that aggregates wholesale energy market data from trusted sources such as OMIE, ENTSO-E, ESIOS, EIA/FRED, and Ember. By normalizing this data into a unified JSON interface, the Energy API empowers developers, data engineers, energy traders, fintech teams, utilities, and ESG/sustainability product teams to access reliable market data effortlessly. In the following sections, we will explore the key features of the Energy API, provide a quick start guide, delve into core endpoints, and discuss real-world use cases that demonstrate its value.

Why Energy API

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

• Unified Data Access: The Energy API consolidates data from multiple sources, including OMIE, ENTSO-E, EIA, and ESIOS, into a single normalized REST interface. This eliminates the need for developers to navigate different formats, schedules, and naming conventions, significantly reducing the time spent on data integration.
• 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. Developers can access a wide range of data points, from spot prices to historical series, all through a consistent JSON schema.
• Rapid Development: The Energy API's standardized endpoints allow developers to ship features in hours rather than weeks. This accelerates the development cycle, enabling teams to focus on building innovative solutions rather than wrestling with data extraction and transformation.
• Trusted Data Providers: The API sources data from reputable organizations, ensuring that users receive accurate and timely information. This reliability is crucial for businesses that depend on precise energy market data for decision-making and reporting.

Quick Start

Getting started with the Energy API is straightforward. The base URL for accessing 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 request was successful.
• date: The date of the data retrieval.
• base: The base currency for the rates provided.
• rates: An object containing the latest prices for the requested symbols.
• currencies: The currencies corresponding to each symbol's price.

Core Endpoints

The Energy API offers a variety of endpoints to cater to different data needs. Below are some core endpoints relevant to energy efficiency reporting:

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"
}
}

Field Explanation:

• rates: Contains the latest prices for the requested symbols, allowing developers to quickly access current market conditions.
• currencies: Provides the currency for each symbol, ensuring clarity in financial reporting.

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"
}
}

Field Explanation:

• date: The date for which the historical prices are retrieved, crucial for trend analysis.
• rates: Provides the historical prices, enabling developers to analyze past market behavior.

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"
}
}

Field Explanation:

• start_date: The beginning of the date range for the time series data.
• end_date: The end of the date range for the time series data.
• rates: Contains daily prices for each symbol, allowing for detailed trend analysis over time.

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=2025-03-31" \
--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
}
}
}

Field Explanation:

• fluctuations: An object containing the start and end values for each symbol, along with the absolute and percentage changes, which are essential for performance analysis.

Real-World Use Cases

The Energy API can be leveraged in various real-world scenarios to enhance energy efficiency reporting and decision-making:

• Price Alert System: Developers can build a price alert system that monitors fluctuations in energy prices. By utilizing the /latest and /fluctuation endpoints, users can receive notifications when prices exceed predefined thresholds, enabling timely decision-making.
• ESG Dashboard: ESG teams can create comprehensive dashboards that visualize energy consumption and carbon emissions data. By integrating data from the /timeseries and /carbon-intensity endpoints, organizations can track their sustainability goals and report progress effectively.
• Cost Calculator: A cost calculator can be developed to estimate monthly energy expenses based on current market prices. By using the /cost-estimate endpoint, businesses can input their expected energy usage and receive accurate cost projections, aiding in budget planning.

FAQ

How often does the TTF gas price update?

The TTF gas price updates daily, providing users with the most current market information. This frequency ensures that developers and businesses can make informed decisions based on the latest data.

Can I get historical energy prices going back 5 years?

Yes, the Energy API allows users to access historical prices for various symbols. By utilizing the /historical and /timeseries endpoints, developers can retrieve data for specific past dates or ranges, enabling comprehensive analysis of market trends over time.

Does the API support multiple currencies?

Absolutely! The Energy API supports multiple currencies, allowing users to specify their preferred currency for price data. This feature is particularly beneficial for international businesses operating in different markets.

Conclusion

In conclusion, the Energy API is a game-changer for organizations seeking to enhance their energy efficiency reporting and streamline access to reliable market data. By providing a unified REST interface that aggregates data from trusted sources, the Energy API eliminates the complexities associated with data integration and empowers developers to build innovative solutions quickly.

Whether you are developing an ESG dashboard, a price alert system, or a cost calculator, the Energy API offers the tools and data you need to succeed. Don't let the challenges of data access hold you back—leverage the power of the Energy API to drive your energy efficiency initiatives forward.

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