We've been Doing Solar All Wrong - This Is the Way

California has completed a different kind of solar project: panels built over an irrigation canal in the Central Valley. The system produces electricity, reduces water lost to evaporation, and avoids taking farmland out of production. It may not change the way most homeowners install solar today, but it points to a larger shift in how California thinks about clean energy and land use.

Key takeaways

• Canal solar can produce power without using farmland or new open space.
• California’s canal network could save billions of gallons of water if covered with solar panels.
• The technology costs more than a typical ground-mounted solar farm.
• The biggest challenge is not just construction. It is getting water districts and utilities to share the costs and benefits.
• For homeowners, the practical lesson is simple: solar works best when the system is designed around the property, energy use, and battery storage—not just panel count.

Why solar is running into a land problem

Solar power has grown quickly because panels are far less expensive than they were decades ago. Batteries have also improved, making it easier to use solar energy after sunset.

But large solar projects need space. That is a serious issue in California’s Central Valley, where much of the land is already being used for farming. The region produces a large share of the country’s fruits, vegetables, and nuts. Covering productive farmland with solar panels creates an obvious conflict.

That led to a practical question: What if solar could be built over land that already has another purpose?

Irrigation canals became one answer. California has roughly 4,000 miles of exposed canals, many of which already have access to power lines and other infrastructure.

The promise of solar over canals

Putting solar panels over canals offers several benefits at the same time:

1. Electricity production: A statewide canal-covering project could provide an estimated 13 gigawatts of clean power.
2. Water savings: Shade can reduce evaporation significantly. Across the full canal network, the potential savings could reach 63 billion gallons each year.
3. Lower maintenance: Less sunlight may reduce algae and aquatic weed growth, which can lower cleanup costs.
4. Cleaner air: Solar power could replace some diesel-powered irrigation pumps.
5. Better panel performance: Panels over water may stay cooler than panels sitting over hot ground, helping them produce more electricity.

This is the kind of idea that sounds almost too good to be true. It produces energy, protects water, and avoids paving over farmland. Still, the details matter.

What Project Nexus is testing

Project Nexus, built in California’s Turlock Irrigation District, is a major test of the concept. The pilot includes both a narrower canal installation and a wider structure. Together, the systems produce about 1.6 megawatts of electricity and include a long-duration battery.

Researchers are tracking more than the power output. They are also measuring:

• How much water remains in the canal
• Algae and weed growth
• Panel temperatures
• Maintenance needs
• How the structures affect canal operations

That last point is important. Canal operators still need to remove silt, clear vegetation, and repair the canal. Panels placed too close to the water may save more evaporation, but they can also make maintenance harder.

A retractable or movable design could help. The goal is to protect the canal while still allowing workers to reach it when needed.

The catch: canal solar costs more

Canal solar is not a simple replacement for a regular solar farm. The structures must span the canal, handle wind, and work around different widths and layouts. Wiring may also need to travel farther, and construction over moving water adds safety and labor costs.

Solar project type	Typical construction cost mentioned in the video
Standard utility-scale solar	About $0.95–$1.23 per watt
Canal-top solar	About $1.90–$2.46 per watt

The project can make more sense when water savings, reduced maintenance, cleaner air, and improved panel performance are counted together. But there is a basic business problem: the water district receives the water benefit, while a utility may receive the electricity revenue.

Turlock is unusual because it controls both its canals and its electric utility. That makes it easier to approve one project and share the results. Other districts may not have the same alignment.

What this means for Southern California homeowners

Most homeowners will not be installing panels over a canal. The useful lesson is the approach behind the project: use existing space wisely, measure the full value, and design around real-world needs.

For a home, that means looking beyond the lowest solar quote. A good system should consider:

• Your roof layout and appearance
• Shade and available panel space
• Your daytime and evening electricity use
• Backup power needs
• Battery sizing
• Utility rules and future rate changes

At Helios Energy Global, we take a similar custom-design approach for Southern California homes. The objective is not to cover every possible roof area. It is to build a system that fits the home, looks intentional, and gives the homeowner a clear understanding of what they are paying for.

That transparency matters even more as California’s energy rules change.

Why batteries matter under NEM 3.0

California’s NEM 3.0 rules generally provide less value for sending excess midday solar back to the grid than earlier net-metering programs did. In plain terms, producing solar power is only part of the plan. Using more of it at home is now much more important.

A battery can store afternoon solar and use it during the evening, when household demand is often higher and grid electricity may cost more. It can also provide backup power during an outage, depending on the system design.

Canal solar may help California add clean energy without sacrificing farmland. For homeowners, the same principle applies on a smaller scale: make the most of the space and energy you already have. With NEM 3.0, a well-designed solar-and-battery system can often make more practical sense than solar panels alone. The right answer depends on the home, the utility rate, and the household’s actual energy habits.