Solar’s Rapid Growth Is Reshaping Power Markets and Net-Zero Planning

Solar power is moving from a supporting role in the energy transition to one of its main engines, with recent data showing how quickly the technology is changing electricity markets, investment decisions and net-zero planning.

A recent Forbes Current Climate report highlighted the speed of the shift in California, where utility-scale solar generated more electricity than natural gas on 82% of days in the first five months of 2026 in the CAISO grid region. That compares with 21% of days in both 2024 and 2025, showing how quickly solar output is gaining ground in one of the world’s most closely watched power markets.

The trend reflects several overlapping forces. Solar modules have become cheaper, installation timelines are generally shorter than those for large thermal power plants, and battery storage is increasingly helping grid operators manage solar’s variable output. At the same time, utilities seeking new gas-fired generation are facing long waits for turbines, creating a practical opening for solar and batteries to meet near-term demand.

Global Data Confirms the Acceleration

The California example is part of a broader global pattern. The International Energy Agency says solar PV is expected to account for almost 80% of global renewable power capacity growth, ahead of wind, hydropower, bioenergy and geothermal. The agency attributes the acceleration to low module costs, relatively efficient permitting in many markets and broad public acceptance.

Ember’s Global Electricity Review 2026 also points to solar as the dominant source of change in the power sector. The think tank found that record solar growth met three-quarters of the net increase in global electricity demand in 2025. Its analysis also found that global fossil fuel generation stopped growing, helped by falling fossil generation in China and India as clean power additions outpaced demand growth.

This matters for industries planning decarbonization strategies because electricity demand is rising across several sectors at once. Electric vehicles, heat pumps, data centers, industrial electrification and green hydrogen projects are all increasing pressure on grids. Solar’s short build times make it attractive for meeting incremental demand, especially where grid connections, land availability and permitting can be managed effectively.

Grid Flexibility Becomes the Next Major Challenge

Rapid solar growth also creates operational challenges. High daytime solar output can push wholesale power prices down during sunny hours, reduce the operating hours of fossil fuel plants and increase the need for flexible capacity. Without sufficient batteries, demand response, transmission upgrades and smarter market design, grids can struggle to absorb rising shares of solar generation efficiently.

Battery storage is therefore becoming increasingly important to solar’s next phase. Storage allows electricity generated during peak daylight hours to be shifted into evening demand periods, improving system reliability and increasing the value of solar generation. Ember noted separately that wind and solar generated more electricity than gas worldwide for the first time in April 2026, with the two sources producing 22% of global electricity that month, compared with 20% from gas.

For policymakers, the main implication is that solar deployment is now less about whether the technology can scale and more about whether grids, markets and permitting systems can keep pace. Countries that want to maximize solar’s contribution to net zero targets will need faster grid connection queues, clearer rules for storage, better forecasting, stronger transmission planning and tariff structures that reward flexibility.

What it Means for Companies and Investors

For companies, the implications are practical. Corporate power purchase agreements, onsite solar, battery-backed facilities and renewable electricity procurement are becoming more relevant to energy cost management and emissions reporting. Businesses with energy-intensive operations may increasingly view solar not only as a sustainability measure, but also as a hedge against volatile gas prices and grid congestion.

There are still limits. Solar output varies by season, weather and time of day. Manufacturing supply chains remain concentrated, particularly in China, raising questions about resilience, trade policy and local industrial strategy. Some regions also face land-use conflicts or grid bottlenecks that slow deployment. These constraints mean solar cannot decarbonize electricity systems alone, but it is increasingly setting the pace for wider power-sector change.

Investment data reinforces the scale of the shift. The IEA’s World Energy Investment 2026 report says global investment in electricity supply and infrastructure is expected to reach USD 1.6 trillion in 2026, rising to USD 2 trillion when end-use electrification is included. This indicates that capital spending is moving toward electricity systems, not only generation assets.

Solar’s Growth Changes the Net-Zero Equation

The broader lesson for the net-zero transition is that solar’s growth is no longer a future projection. It is already altering dispatch patterns, investment choices and the economics of competing energy sources. Natural gas remains important for reliability in many systems, especially where storage and transmission are insufficient. But the direction of travel is clear: solar is becoming one of the defining technologies of the electricity era.

As more economies electrify transport, buildings and industry, the ability to integrate large volumes of low-cost solar will become a competitive advantage. The next challenge is not simply building more panels. It is building the grids, storage systems, market rules and planning frameworks needed to turn fast-growing solar capacity into reliable, affordable and lower-carbon electricity.

Source: www.forbes.com