The Global Energy Transition Index is published by:

The correct answer is World Economic Forum.

Explanation:

The Global Energy Transition Index (ETI) is a benchmark report published annually by the World Economic Forum (WEF) in collaboration with Accenture. The index evaluates and tracks the performance of energy systems across various countries, measuring their readiness for transition towards secure, sustainable, affordable, and inclusive energy systems.

Key Highlights:

1. Purpose: It provides insights into countries' current energy system performance and environmental sustainability.

2. Dimensions: The index assesses countries based on two main sub-indices:

- System Performance: Focuses on economic development, energy security, and environmental sustainability.

- Transition Readiness: Measures enabling factors such as capital investment, governance, infrastructure, and human capital.

3. Publishing Body: World Economic Forum (WEF).