How does concentrated solar power differ from regular solar panels?

Key differences between CSP and solar PV

Concentrated solar power (CSP) and photovoltaic (PV) solar panels both convert sunlight into usable energy, but they do so in fundamentally different ways. PV panels convert sunlight directly into electricity using semiconductor cells. CSP systems concentrate sunlight with mirrors or lenses to produce heat, which is then used to generate electricity through a heat engine (usually a steam turbine) or to provide process heat.

Main differences include:

• Energy conversion method: PV uses the photovoltaic effect to generate electricity directly; CSP converts light to heat, then to electricity.
• Role of heat storage: CSP easily integrates thermal energy storage (molten salts, ceramics) to deliver electricity when the sun isn’t shining; PV typically relies on batteries for electricity storage.
• Scale and siting: CSP plants are generally larger utility-scale installations located where direct normal irradiance (DNI) is high, whereas PV can be deployed at many scales and in more varied climates.
• Efficiency at high temperatures: CSP systems can operate at high temperatures, enabling conventional heat-to-electricity cycles with good efficiency and potential for industrial heat applications.
• Intermittency and dispatchability: CSP with thermal storage can be dispatchable—able to produce power on demand—while PV’s dispatchability depends on electrical storage or grid supply.

Typical CSP technologies include parabolic troughs, power towers (heliostat fields), linear Fresnel, and dish systems. Each focuses sunlight differently and targets different temperature ranges. PV systems are simpler in terms of optics and moving parts, but CSP provides a direct pathway to thermal storage and high-temperature applications.

When choosing between CSP and PV, key considerations are climate (CSP needs strong direct sunlight), scale, storage needs, and whether the project benefits from high-temperature heat for industrial processes. In many regions, PV costs have fallen faster, but CSP remains attractive where thermal storage and large-scale, dispatchable renewable energy are priorities.