Finding Cheap New Energy Under America's City Streets


The recession that hit the US in 2008 shrank city budgets, forcing departments to do more with less. Aging infrastructure and steady population growth compound the problem. And growing energy demand haunts city planners - India and threats of blackouts becoming everyone's worst-case scenario. Ironically, one solution lies under every city's streets.

Welcome to one version of the future. Although it was January, the warm Southern California sun beat down on a bright blue section of steel water pipe as it was lowered into the ground in Riverside, California. Moving methodically around the pipe, workers using a small hoist got it into place and bolted it into an existing pipeline that delivers water from a nearby canal to homes and businesses.

Replacing a section of water pipe is nothing out of the ordinary, but this was no ordinary pipe. It was the first commercial deployment of Lucid Energy's in-pipe hydropower system that allows cities to produce energy from water moving through vast networks of gravity-fed pipelines. (See the company's frequently asked questions.)

An untapped energy source

To convince city managers around the country that Lucid's innovative turbine generates reliable power and won't impair water pressure, the Riverside demonstration project opened last April after tweaking four iterations. This one worked "flawlessly," Kevin Milligan, the city's assistant manager for water, told the Portland Tribune. Having flown in from all over the world, utility managers - all possible customers - gathered around the churning turbine, scrutinizing this new source of energy.

?"A Lucid pipe can be installed in a day and can begin generating clean, constant, energy in a week," Josh Kanagy, Lucid's director of business development, told the crowd and Water World magazine. Watch a video from the press junket:

Lucid's system uses a 25-foot-long steel pipe, wider at each end and tapered toward the middle, causing water pressure to rise as it hits the turbine's five teardrop-shaped blades. Water pressure recovers soon after it moves the blades and produces electricity.

In Riverside, water pressure loss from each turbine is minimal, about three to four pounds per square inch, Milligan says. "You can add as many turbines as you have pressure to extract," he says.

A string of four turbines in a section of pipe carrying water downhill might produce enough electricity to power 100 homes, says Gregg Semler, Lucid's CEO. The cost payback - without any government subsidies -"is about three to four times better than solar or wind installations." And like wind and solar energy, there are no carbon emissions from Lucid's turbines. But it can pump out electricity around the clock.

New infrastructure totaling $650 billion

Lucid was founded in 2007, based on the work of three Russian scientists who tried to produce hydropower from rivers without harming fish. When that plan didn't pan out, Rod Schlabach, Lucid's head of engineering, came up with the in-pipe

hydrosystem. Soon afterwards, the company found an important backer, Northwest Pipe Co., a $387 million-a-year pipe manufacturer based in Vancouver, Wash.

"They know where every pipe opportunity is in the United States," Semler says, whether it's new pipes or repairing old ones.

The potential for this new technology is huge. According to the EPA, $650 billion of infrastructure upgrades are needed to replace aging pipelines and supply new demand for the next 20 years. Putting Lucid's systems into these new pipelines could create billions of megawatts of electricity from a now-untapped resource.

More interest in Lucid's turbine

According to MySA, the city of San Antonio, Texas, will also tap into energy flowing under the city's streets and plans to install three Lucid turbines inside a new 24-inch pipeline bringing water to the city. This will save between $16,000 and $38,000 a year by generating electricity it would have to purchase. And more utilities are seeing the benefit of Lucid's turbines.

The company is also negotiating with Portland, Oregon, which uses gravity to pipe water downhill to most of its customers. Since the city typically digs up five to ten miles of dirt a year to repair pipes or lay new ones, a lot of the labor costs are already built into the budget.

"Where we can employ them, it makes sense to do so," says Michael Stuhr, the bureau's chief engineer. "From an engineering point of view, they are an elegant piece of machinery, and I think pretty trustworthy."

Lucide Energy information: overview; fact sheet; Northwest Powerpipe

Will this move beyond just a niche market?

Photos: various - Lucide Energy

Comments

Robert S.'s picture

This looks like an interesting system. Though, with the exception of a few specific case, this is waste energy recovery not power generation. Unless your water source is uphill of your customer, you are just recovering energy you had to put into the water to get it moving in the first place. Would a better solution be to analyze your pipeline and reduce the head that you create? The construction costs are largely built in, but it is usually more effective to now expend the initial energy than it is to try and recovery extra energy. It would be interesting to know if they are working on smaller units to recovery head from waste streams. If you have restrooms on the 85th floor, why not capture from of the energy from the waste water flowing back to grade level?

Kent Harrington's picture

All of their systems are currently being installed or sited for gravity-fed systems. Not sure how much that limits their system's implementation. The company hasn't officially offered anything for buildings.

Rod Schlabach's picture

We are currently targeting pipe 2 feet diameter and up. Also, the pipe reducers (tapered pieces) are to increase the water velocity through the turbone, not change the pressure. Most installations won't require reducers.

jvasko's picture

Great post Kent and interesting read.

Kent Harrington's picture

Thanks. It's always nice to see ingenuity crop up in so many places.

Raj's picture

I love ideas like this. They take what already exists, in this case the underground water network, and use them to extract energy that is ALREADY there! Lucid Energy should be given a lot of credit and help in rolling this out. I mean can you imagine having such a system installed as standard every where? Surely this should be snapped up by governments and companies all around the world who are looking at alternative and inovative ways to produce green energy.