As an expert in the field of energy, I am often asked about the contribution of renewable energy to the global energy mix. The statistics vary from year to year, and they are influenced by a variety of factors including technological advancements, policy changes, and economic conditions.

To begin with, the International Energy Agency (IEA) provides a comprehensive overview of the world's energy landscape. According to their reports, the share of renewable energy in the total primary energy supply has been gradually increasing. In 2012, the figure was around 13.2%. However, it is important to note that this percentage is not only about electricity generation but includes all forms of energy used, such as heat and transport fuels.

Moving forward to 2013, renewable sources accounted for almost 22% of global electricity generation. This is a significant increase and reflects the growing importance of renewable energy in the electricity sector. The IEA's Medium-Term Renewable Energy Report from 2015 projected that this share would reach at least 26% by 2020, which is a substantial increase from the earlier years.

However, these figures need to be interpreted with caution. The growth in renewable energy is not uniform across all countries and regions. Some countries have made significant strides in integrating renewable energy into their energy systems, while others are still in the early stages of development. Additionally, the definition of 'renewable energy' can vary, and the inclusion of certain types of energy, such as large hydroelectric power, can significantly alter the percentages.

Furthermore, the growth of renewable energy is often driven by policy support. Governments around the world have implemented various policies and incentives to encourage the development and use of renewable energy. These policies can include subsidies, tax credits, and renewable energy targets or mandates. The effectiveness of these policies can greatly influence the rate at which renewable energy is adopted.

Technological advancements also play a crucial role in the growth of renewable energy. Improvements in solar panel efficiency, wind turbine technology, and energy storage solutions have all contributed to making renewable energy more competitive and accessible. As these technologies continue to improve, we can expect the cost of renewable energy to decrease, further driving its adoption.

In conclusion, while the exact percentage of the world's energy that comes from renewable sources can fluctuate, the overall trend is towards an increased reliance on renewable energy. The figures from the IEA and other sources indicate a clear upward trajectory, but it is essential to consider the broader context of energy policy, technological development, and regional differences when interpreting these statistics.

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In 2012, the world relied on renewable sources for around 13.2% of its total primary energy supply. In 2013 renewables accounted for almost 22% of global electricity generation, and the IEA Medium-Term Renewable Energy Report 2015 foresees that share reaching at least 26% increase in 2020.read more >>