How much cheaper is PV for basic electricity generation?
For straightforward, daytime-only electricity, photovoltaic solar is significantly cheaper than concentrated solar power. A 2023 technoeconomic analysis in Pakistan compared 100 MW PV and CSP plants at multiple locations and found PV's levelized cost of electricity (LCOE) ranged from 5.95 to 7.36 cents per kilowatt-hour, depending on the site [4]. In contrast, the best-case CSP plant (a parabolic trough design) had an LCOE of 10.8 cents/kWh — roughly 80% higher than the cheapest PV option [4]. This means that for every dollar spent on PV electricity, you would need to spend nearly two dollars to get the same amount of electricity from CSP.
The gap is even wider in less ideal locations. At a site in Quetta, Pakistan, CSP's LCOE was 12 cents/kWh, while PV at the same location was only 6.02 cents/kWh — a 99% premium [4]. These figures come from a study that carefully accounted for local climate, geography, and financing costs, making them a realistic benchmark for regions with good solar resources.
When does CSP actually win on cost?
CSP's main advantage is its ability to store energy as heat cheaply and deliver electricity on demand, even after the sun sets. A 2022 study of integrated CSP-PV hybrid plants found that when you need power around the clock, CSP with thermal storage can beat PV-plus-batteries on cost. The analysis showed that a highly integrated hybrid plant (where excess PV power is used to heat molten salt storage) achieved a 20% cost advantage over simply co-locating separate PV and CSP plants, while still providing the same flexible, dispatchable power [5]. This means that for grid operators who must guarantee electricity 24/7, CSP-based hybrids can be more economical than relying on PV alone.
Another 2024 study of a novel 'CSP+' hybrid system — which uses a beam splitter to send the right wavelengths to both PV cells and a thermal receiver — found even more dramatic savings. In a scenario that produced both electricity and heat, the levelized cost of electricity was reduced by up to 70% compared to benchmark values, and the cost of heat dropped by 40% [1]. However, this is a cutting-edge design not yet commercialized, so real-world costs may differ.
What are the practical limits that keep CSP from competing broadly?
Despite its storage advantage, CSP faces several hurdles that prevent it from undercutting PV on a wide scale. First, CSP plants are more complex and capital-intensive. A 2024 technoeconomic evaluation of compact hybrid PV-CSP systems found that when realistic solar cell technologies are used — rather than idealized theoretical cells — the performance advantage of hybrids over standalone CSP shrinks significantly [2]. The study noted that real-world cell efficiencies are far from theoretical limits, which restricts the range of conditions where hybrids can outperform CSP alone [2].
Second, CSP requires direct sunlight (direct normal irradiance), making it unsuitable for cloudy or hazy regions. A 2021 study in Rwanda concluded that PV microgrids were far more cost-effective for rural off-grid areas because of their lower net present cost, and recommended PV as the rapid, economical path to electrification [3]. CSP simply cannot compete in such dispersed, low-resource settings.
Finally, the economic viability of CSP is highly sensitive to financing costs. The 2024 CSP+ study found that the weighted average cost of capital was the single most influential factor in determining economic performance [1]. In countries with high interest rates, CSP projects become even less attractive compared to PV, which has lower upfront costs and faster deployment.
Sources used in this answer
Environmental and economic impacts of photovoltaic integration in concentrated solar power plants
A novel CSP+ hybrid system (PV integrated with CSP via a beam splitter) can reduce levelized cost of electricity by up to 70% and heat cost by 40% compared to benchmarks, but economic performance is highly sensitive to the cost of capital.
From ideal to realistic compact hybrid PV-CSP systems: A technoeconomic evaluation
When realistic (not idealized) solar cells are used, compact PV-CSP hybrid systems lose much of their theoretical cost advantage over standalone CSP, limiting their competitiveness.
Concentrated Solar Power and Photovoltaic Systems: A New Approach to Boost Sustainable Energy for All (Se4all) in Rwanda
For rural off-grid electrification in Rwanda, PV microgrids are far more cost-effective than CSP due to lower net present cost, making PV the recommended technology.
Potential Assessment and Economic Analysis of Concentrated Solar Power against Solar Photovoltaic Technology
In Pakistan, 100 MW PV plants achieved LCOEs of 5.95–7.36 cents/kWh, while CSP parabolic trough plants had LCOEs of 10.8–12 cents/kWh — PV was roughly 40–50% cheaper.
Analysis of an integrated CSP-PV hybrid power plant
A highly integrated CSP-PV hybrid plant (using excess PV power to heat molten salt storage) achieved a 20% cost advantage over simply co-located PV and CSP plants, while maintaining dispatchable power.