Over the past three decades, the renewable energy industry has undergone a profound transformation, driven by technological advancements, large-scale project development, strategic colocation and unprecedented industry collaboration. These developments have significantly bolstered the global transition towards a sustainable energy future, supporting international climate targets and net zero ambitions.

One of the defining aspects of renewable energy’s evolution has been the rapid advancement in technology. In the early 1990s, renewable energy sources such as wind and solar were nascent technologies with high costs and limited efficiency. Since then, substantial research and development have led to major breakthroughs, including: 

• Solar photovoltaic (PV) cell efficiency has dramatically improved, increasing from around 15% in the 1990s to more than 22% today, with next-generation perovskite and tandem cells pushing efficiency limits even further.
• Wind turbines have evolved significantly, growing from small-scale models to offshore giants with capacities exceeding 15 MW. Floating offshore wind technology has also emerged, unlocking energy generation potential in deep waters.
• Battery storage technologies, particularly lithium-ion and solid-state batteries, have improved to enable better grid stability and energy management. The advent of green hydrogen production has also introduced new possibilities for long-duration storage and sector coupling.
• The integration of artificial intelligence, machine learning and predictive analytics has optimised energy output, maintenance schedules and demand forecasting, increasing overall project efficiency.

Utility-scale projects
Renewable energy projects have also transitioned from small, decentralised initiatives to massive utility-scale developments. In the early 2000s, wind farms and solar parks were typically measured in megawatts (MW), but today’s projects reach gigawatt (GW) scale.

Solar mega-farms like the Bhadla solar park in India (2.25 GW) and the Noor Abu Dhabi solar plant (1.18 GW) demonstrate the global shift towards large-scale solar installations. Similarly, offshore wind projects such as the Dogger Bank wind farm in the UK (in which Natural Power was extensively involved), which is set to become the world’s largest offshore wind project at 3.6 GW, highlight the industry’s scaling capabilities.

Hybrid renewable energy complexes are also emerging with some projects now integrating multiple renewable sources, such as the Hornsdale Power Reserve in Australia, which combines wind energy with Tesla’s advanced battery storage. The original battery installation in 2017 was the largest lithium-ion battery in the world at 129 MWh and 100 MW. It has since been expanded to 194 MWh and 150 MW.

This ability to scale up has been made possible by declining costs, improved grid infrastructure and increased investor confidence, reinforcing the viability of renewables as a primary energy source.

Renewable energy projects have also transitioned from small, decentralised initiatives to massive utility-scale developments. In the early 2000s, wind farms and solar parks were typically measured in megawatts (MW), but today’s projects reach gigawatt (GW) scale.

Furthermore, this key trend towards the strategic colocation of renewable energy projects, where multiple energy sources share infrastructure and land to enhance efficiency, has huge potential across multiple technology mixes. For example, solar and wind hybrid projects maximise energy output by leveraging complementary generation patterns, reducing intermittency issues. Meanwhile, agrivoltaics integrate solar panels with agricultural land, enabling farmers to generate energy while maintaining crop production.

Also, floating solar farms, installed on reservoirs and lakes, reduce the need for valuable land that could be used for agriculture, housing or other infrastructure. And the colocation of wind and solar farms with electrolysers for green hydrogen production is emerging as a game-changer for decarbonising heavy industries such as steel and transport.

Industry collaboration
Throughout the last 30 years, industry collaboration has played a vital role in driving renewables forward. Public-private partnerships, cross-sector alliances and international cooperation have significantly accelerated progress.

International agreements, such as the 2015 Paris Agreement on climate change, set a clear global framework for reducing carbon emissions, prompting national governments to scale up renewable energy commitments. Such intergovernmental initiatives are also facilitated by organisations such as the International Renewable Energy Agency and the Global Wind Energy Council, which have enabled knowledge-sharing and policy harmonisation across countries.

Cross-border energy projects, such as the European Supergrid and China’s Ultra High Voltage (UHV) transmission networks, are helping to stabilise and distribute clean energy across large regions.

But collaboration is not just at the governmental level. Major corporations, such as Google, Amazon and Microsoft, have become leading buyers of renewable energy through long-term corporate power purchase agreements, ensuring steady investment and demand for clean power.

The cumulative impact of these advancements is profound. The International Energy Agency projects that renewables will account for more than 90% of global electricity expansion in the coming years. Solar and wind are expected to become the backbone of global electricity systems, while storage, hydrogen and smart grids will enhance their reliability and integration.

However, significant challenges remain, including supply chain constraints, permitting delays, and the need for further grid upgrades and modernisation. Addressing these issues will require continued collaboration, policy support and technological innovation.

Throughout our 30 years in business with Natural Power, we have seen the renewable energy industry evolve tremendously, from niche, high-cost technologies to mainstream energy solutions driving the global decarbonisation agenda. Technological advancements, large-scale project developments, strategic colocation and cross-sector collaboration have collectively enabled a cleaner, more resilient energy future. As the world moves towards ambitious net zero targets, the next decades promise even greater strides in making renewable energy the cornerstone of global power generation.

The views and opinions expressed in this article are strictly those of the authors only and are not necessarily given or endorsed by or on behalf of the Energy Institute.

• Further reading: ‘EU funding, AI R&D and UK CfD leadership are driving tidal and wave energy projects forwards’. The marine energy sector has been in a stir recently. Recent projects include the deployment of Japan’s first ever 1.1 MW tidal turbine, a French pilot tidal project securing significant EU funding, and the development of an AI wave energy control project. Meanwhile, a new report from the Energy Industries Council suggests the UK is emerging as a global leader in wave and tidal energy, accounting for nearly 40% of all wave and tidal projects worldwide.
• Wind turbine design is not standing still. Find more about new research and technological innovations that are set to improve the design, operation and environmental impact of wind farms.