Turning human energy into electricity: Power to the people power!

This morning I came across a sweet little article —

Merry-go-round turns play into clean power for students in Ghana


And that made me ask, once again, as millions upon millions of us have asked at one time or another, why not turn human exercise into electricity? I.e., why not people power?

Here’s two articles that speak to this (obvious but, so far, mostly elusive) innovation. The first enumerates the various difficulties encountered along the way to developing the technology for people-powered bicycles, and ends up talking about “crowd farming” in health clubs that have switched to this way of powering their facilities.

And the second article features Green Heart, a company in the U.K. that started out with outdoor exercise equipment, and has since scaled the phenomenon of people power up, way up.

BTW: I notice that both tech pioneers referenced in these two articles are female (with male or, I should say, ambiguous names, “Hudson” and “Georgie.”)

Pedal-Powered Electricity Generators: High-Voltage Workouts

Thanks to a few tinkering cyclists, pedal-powered electricity generators have finally arrived.

by Bob Parks


It’s been a preoccupation of inquisitive geeks for a long time: trying to extract useable electric power from a bicycle. In basements or garages, they have mounted DC generators and Trek 1200s onto yard-sale trainers, testing voltages and waiting for that eureka moment. The quest has become more popular lately, but it has always served as a emblem for lean and desperate times: Think of Gilligan atop a bamboo bike powering the Professor’s makeshift radio, Edward G. Robinson wheezing on his trainer to urge a lightbulb to life in Soylent Green or ectomorph Ed Begley, Jr. deep into lactate threshold on HGTV to make eco-friendly toast.

The problem is that our legs don’t have the raw output to make much juice. If you cycle with a power meter, you know that a fairly strenuous ride yields an average of about 140 watts for an hour. Mount your bike to a generator, slice off 30 percent for mechanical and electrical losses, and you’ve put out a measly 100-watt average during your sweaty hour. It amounts to around a penny’s worth of electricity, one three-hundredth of a typical home’s daily use—not enough juice to run the PlayStation for 15 minutes.

Until recently, because of low output and high equipment costs, bike generators were mainly used as green educational tools or feel-good gestures for convention booths. On their own, the gadgets had no hope of producing enough power to pay for their own materials, which start at around $250, not including the bike. And because most setups utilized lead batteries, the net environmental impact of making electricity this way would have been devastating if everyone did it.

But that all changed one day in 2007, when recreational triathlete and college student Hudson Harr started trolling Craigslist for the parts to take the latest stab at the time-honored experiment. Harr, then 21, was crashing at his mom’s house in St. Petersburg, Florida. “I told her I was going to do a little prototyping,” he says. “Little did she know the living room was going to be packed with gym equipment and electronics.”

After tearing apart several health-club machines, Harr discovered that the Precor elliptical trainer has an onboard generator to power the screen. He began to form an idea for a company, one that wouldn’t force gyms to buy new devices to produce pedal-powered electricity. “Making use of what’s already there is a big part of the idea’s return-on-investment and environmental sustainability,” he says. “If our customers had to buy a new piece of gear, it would be the opposite of sustainable. It would be like, ‘Hey, throw away your truck, I have your new Prius right here.'”

As Harr started to solicit the expertise of engineers, his design came to include a circuit that sends power directly to the customer’s grid, and thus does away with batteries and their environmental issues. But the most crucial breakthrough of all was Harr’s choice of venue—health clubs. Because the machines are in near-constant use, they can harness a phenomenon known as “crowd farming”—the collective impact of small contributions from a mass of people. Harr’s machines put out just 0.1 kilowatt—but because they’re used for 10 hours or more a day, they harvest enough to pay back their owners within 15 years, roughly the same payback as solar electric.

Health-club owners immediately saw the financial and marketing advantages of such devices, and Harr’s company, ReRev, now has 150 machines at more than a dozen gyms. Each facility creates enough electricity to run a small home, and one recently surpassed a megawatt of utility-grade power. In addition to the electrical infrastructure, the firm installs readouts on every exercise station to let users know how much they produced in a workout. Plans are afoot to let gyms compete against each other for kilowatt-hour bragging rights.

Around the same time the young CEO began his experiments, a group of entrepreneurs in Ridgefield, Connecticut, began prototyping a generator that works with a stationary bike. Their company, Green Revolution, enables Spin classes to monitor their energy production on a wall behind the instructor, with a similar equipment cost and payback schedule as ReRev. By all accounts its modified spinners feel like regular ones, complete with adjustable resistance levels; when you add resistance you also increase the bike’s power output. But whatever tech you straddle while waiting out the next snowstorm, it’s clear that the grid is in for some jolts of collective leg power. “It’s remarkable to watch our data coming through—the ebb and flow of people working out day after day,” says Harr.

Meanwhile, individual cyclists continue to experiment to find a domestic role for their pedaling, according to Tamara Dean, whose book, The Human-Powered Home: Choosing Muscles over Motors, documents her family’s use of bike generators, as well as bike-powered mechanical blenders and grain grinders. Her book, which she wrote using a bike-powered laptop, includes detailed instructions on how to build your own generator. Need serious power on your commute? High Tide Labs, in Palo Alto, California, recently launched a bike-mounted generator called the RollerGen, which puts out more than 30 watts—enough to recharge a laptop computer—as long as you’re ride faster than 8 mph.

No matter how accessible pedal power becomes, though, cyclists will probably continue to tinker. In Los Gatos, California, website manager David Butcher, 54, has trained an hour per day nearly every day for the last five years to power his home office equipment, cell phone, electric chainsaw, washing machine and other household gadgets. He started with a simple mock-up 30 years ago, and continues to upgrade his system to increase its efficiency. For instance, he swapped his back wheel for a 36-inch wooden tabletop milled to a perfect circle to drive his generator, and eliminated the chain by bolting the flywheel directly to the crankshaft.

All the modifications still don’t make a significant dent in Butcher’s overall consumption. But, he says, “The true value of this has to do with intangibles. Rather than relying on power that may not be good for the environment, you know this power is good for you. And you grow a personal connection with the concept of a watt. It inspires me to push a little harder.

“It’s like the way people tend a garden just for a couple of tomatoes,” Butcher says. “You drive all over town to get supplies and work on it every weekend. Has it really paid off in time or money? No, those tomatoes probably cost $20 a piece. But you love ’em.”

Green Heart outdoor gym turns people power into electricity

June 25, 2012



The TGO Green Heart outdoor gym converts energy generated by users of its exercise equipme...

The TGO Green Heart outdoor gym converts energy generated by users of its exercise equipment into useable electricity

Image Gallery (6 images)

Many of today’s deskbound workers regularly head to the gym to try and keep the fat from clinging to their waistlines. For those who are also fond of the great outdoors, a UK company has developed and installed over 250 open air exercise areas across the country. The latest addition to a product catalog featuring robust, weather-proof versions of exercise machines you might find in any modern indoor gym is the world’s first energy-harvesting outdoor gym called the TGO Green Heart. As users burn off the calories on the free-to-use cross trainer, hand bike, fitness bike and recumbent bike, the company’s proprietary technology harvests all that people power and converts it into useable electricity.

As well as having over 200 installations of outdoor gyms, mini multi-use games areas, climbing walls, and performance-and-dance spaces, the Great Outdoor Gym Company has also created around 50 London 2012 logo-shaped outdoor fitness and sport spaces called adiZones in collaboration with Adidas. Each gym is said to serve a community of 5,000 people and TGOGC aims to install 100 outdoor gyms per year for the next five years as part of a pledge to the UK’s Department of Health. The City of Hull is already home to a number of TGO outdoor gyms and was therefore the logical choice for its new Green Heart pilot project.

The TGO Green Heart outdoor gym features a Power Display Wall that measures and displays t...

In addition to the power-generating cardio outdoor exercise equipment, the TGO Green Heart at Shaw Park, Hull also features a Power Display Wall that measures and displays the energy generated by the heart-shaped gym’s users. There’s a place to check your weight, measure your height and work out your BMI, as well as a covered communal seating area. The generated electricity is used to light the exercise zone at night but it could also be fed into local buildings or even the National Grid.

All equipment is designed to comply with the European playground standard EN1176 aimed at making play areas safe for all to use, and is made in UK using kite-marked steel, anti-tamper fixings and installed securely with ground sockets.

The company is currently taking orders for a broader rollout of its Green Heart, both in the UK and abroad, once the initial Hull pilot has come to an end later this year. TGOGC can also oversee site maintenance and has committed to plant a tree for every piece of equipment that’s purchased during 2012.

This video shows TGOGC’s Creative Director Georgie Delaney giving an overview the Green Heart project:

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