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Aug 2024
56m 46s

The extraordinary resurgence of concentr...

Wood Mackenzie
About this episode

Complex, outdated, expensive: concentrating solar power used to be a clunky way of harnessing the sun. What’s changed to now make it viable? 

Concentrating Solar Power, or CSP, takes energy from the sun, converts it to heat, and uses it to drive a turbine to provide renewable electricity. It has more moving parts than photovoltaic (PV) solar – which has none – so there is more that can go wrong. But it has the big advantage that the heat can be stored for days, weeks and even months, meaning that CSP can support grid stability even when the sun isn’t shining. Its real competition isn’t PV solar, but other “clean firm” power sources such as geothermal. 

The US Department of Energy is funding 25 projects in this area, with almost $100 million to research and develop CSP technologies. To discuss the technology and the viability of a process that’s been trying to get off the ground in the US for decades, Melissa Lott and Amy Myers-Jaffe are joined by Dr Matt Bauer from the Solar Energy Technologies Office.

They explore the different generations of CSP technology, with Gen 3 focusing on higher temperature heat and more efficient power cycles. The steep learning curve and capital intensity of CSP plants is a particular barrier to deployment at the moment, as is the risk associated with building large thermal plants. The potential for CSP to bridge seasonal energy storage gaps is there; unlocking it is the problem.

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