Solar: Panel prices have plummeted since 2000 but it is creating its own problems with aging grids

Solar power has undergone a staggering price transformation over the past 25 years. Panels that cost roughly $5 to $6 per watt around 2000 now sell for approximately 12 cents per watt, according to data cited by TechSpot from Ember co-founder Dave Jones. The collapse has helped turn rooftop and commercial solar from a niche technology into a mainstream source of electricity.

Terawatt-tier supply capacity

The decline has been driven largely by manufacturing scale, technological improvements, and China's enormous expansion of solar production. Wood Mackenzie estimates that China's solar manufacturing capacity has reached roughly 1.36 terawatts, creating an enormous supply base for panels deployed worldwide.

The result is visible far beyond traditional solar markets. Global solar generation continues to expand rapidly, with the Energy Institute reporting that solar generation grew by 30% worldwide in 2025. Renewables were also the largest contributor to growth in total energy supply during the year, with solar accounting for 71% of the increase in renewable energy.

Businesses have particularly strong incentives to install panels because their electricity consumption often peaks during daylight hours, when solar production is highest. In Pakistan, for example, Bestway Cement's plant in Chakwal already gets more than a quarter of its electricity from a 26MW solar installation and plans to add another 6.34MW.

Rooftop solar is also spreading rapidly among households. India has installed panels on more than five million homes through its national rooftop-solar subsidy program, while rooftop capacity in the Philippines has reportedly nearly doubled over 12 months.

Solar-centric grid complications?

But cheap solar creates an awkward problem for electricity utilities. Customers with rooftop panels and batteries can buy far less electricity from the grid while still relying on it at night, during cloudy weather, and whenever their batteries run out. Utilities therefore face falling electricity sales without being able to eliminate the infrastructure needed to keep those customers connected. The technical challenge is just as significant. Solar output can change rapidly as weather conditions shift, while large amounts of rooftop generation can push electricity back into local distribution networks. In regions with high solar penetration, daytime demand can drop sharply, making it harder to balance conventional generators and maintain grid stability.

That does not mean solar is becoming less useful. Instead, falling hardware costs are shifting the industry's biggest challenges elsewhere. Batteries, improved forecasting, flexible electricity pricing, and upgraded distribution networks are increasingly important as more generation moves from centralized power plants to homes and businesses.

The economics have already changed dramatically. The next phase of the solar revolution may be less about making panels cheaper and more about rebuilding electrical systems to accommodate cheap solar everywhere.

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