Liquid Batteries for Solar and Wind Power

In an industrial park on the outskirts of Pullman, Wash., 10 white storage trailers sit side by side, neatly arranged in two rows.

These are no ordinary storage units. Arranged on racks inside are the guts of a large rechargeable battery, the kind of device that can store and release utility-scale amounts of electricity.

But this is no ordinary storage battery, either. In contrast with the typical lead-acid batteries used to start car engines or the lithium-ion cells that power electric vehicles — both of which are largely solid — this battery is mostly liquid.

The chemicals that react to produce electricity are dissolved in water and circulated into and out of the heart of each cell, where the reaction occurs. For that reason, it is called a flow battery, and the one in Pullman, a demonstration project that will be tested over the next year and a half, is one of the largest in the world. It can store about 3.2 megawatt-hours of energy and discharge a megawatt of power for over three to four hours — enough to keep 500 average homes going for an afternoon.

Flow batteries are not new (and they are similar, in some ways, to fuel cells), but they have never really caught on. They were invented in France in the 19th century and studied by NASA in the 1970s as potential power sources in space or on the moon.

Now, flow batteries are being viewed as a possible way to help the electrical grid handle greater amounts of renewable energy, and they are being developed further by companies like UniEnergy Technologies, the maker of the Pullman battery, and academic and government researchers.

Because solar panels and wind turbines produce varying amounts of electricity during the day, utilities and system operators must work harder to integrate the renewable sources into the grid. Batteries are one way to do this, by storing excess electricity from solar panels during the middle of the day, for example, and releasing it in the evening.

Such batteries are being used mostly for purposes other than integrating renewables into the grid — for example, by providing short infusions of electricity to keep the grid stable. Only 60 megawatts of storage were in use in the United States last year. But storage is expected to grow rapidly as prices of batteries and related control equipment fall.

Other battery technologies — notably lithium ion, by virtue of its widespread use by Tesla Motors and other electric-car makers — have a head start in the market.

Experts say, however, that flow batteries have some advantages that make them well suited to grid storage.

“I see flow batteries as being increasingly important,” said Imre Gyuk, who manages an Energy Department program to help develop technologies for utility-scale electricity storage.

Lithium-ion and lead-acid batteries pack more power for their size, which makes them especially useful for tasks like turning over a gasoline engine or getting an electric car moving from a full stop. And watt per watt they are smaller than flow batteries, which have tanks for the liquid chemicals and equipment to pump them into the cells.

But on the grid, batteries do not need to supply a lot of power at once; instead, they need to provide energy steadily over time. And compact size is not as important.

“A smaller footprint is not as useful in a stationary battery,” Dr. Gyuk said.

Because the electricity-producing reactions take place in the liquids, increasing the size of the tanks allows flow batteries to store larger amounts of electricity. While there are practical and economic limits to their capacity, flow batteries are seen as having potential for situations where a battery system has to discharge a large amount of electricity for more than a few hours.

“If you’re talking six-hour batteries, you’re probably going to be looking at flow batteries,” said Matt Roberts, executive director of the Energy Storage Association, an industry group.

Rick Winter, chief operating officer of UniEnergy Technologies, which is based in Mukilteo, Wash., said flow batteries had other advantages as well. Compared with other batteries, which lose capacity as they go through many charge-discharge cycles and must eventually be replaced, flow batteries have much longer life — the company warrants the battery for 20 years and unlimited cycles. Flow batteries can also be completely discharged — something that is not recommended for lithium-ion and other types because it affects their longevity.

“There’s no physical mechanism for degrading the system,” Mr. Winter said. “It’s going to have the same power and energy rating no matter how many times you cycle it.”

The Pullman battery uses vanadium salts for its energy-producing reactions, a chemistry that was developed at the Pacific Northwest National Laboratory. (At a White House business forum four years ago, President Obama mentioned the vanadium process and commented, “That’s one of the coolest things I’ve ever said out loud.”)

The demonstration project, which cost $7 million, was paid for by the region’s utility, Avista, and a grant from a state clean energy fund. It will be used to add electricity to the grid in times of peak demand, but because it is on the campus of a large electrical engineering company — a big user of electricity — it will also be tested as a large uninterruptible power supply. It will kick in nearly instantaneously in a power failure to keep the company’s sensitive digital equipment running.

“It will be fast enough that the equipment won’t notice the outage,” Mr. Winter said.

Wind Power Blades Get Bigger, Turbines Get Smarter.

A look at tomorrow’s turbines

Wind Power Future
Metal inserts built into the carbon-fiber blade during manufacture mean the root end, bolted to the hub, can be slimmer, stronger, and more aerodynamically efficient. • Fabricating the carbon fiber in modular pieces, rather than one long blade, ensures the material’s consistency and reduces the risk of failure. • An erosion-protection material molded into the leading edge of the blade reduces wear and tear over the blade’s lifetime.
Graham Murdoch

In 2012, wind power added more new electricity production in the U.S. than any other single source. But even with 60 gigawatts powering 15 million homes, wind supplants just 1.8 percent of the nation’s carbon emissions. Tomorrow’s turbines will have to be more efficient, more affordable, and
in more places.

The Supersize Route

Bigger Blades

Big rotors generate more electricity, particularly from low winds, but oversize trucks hauling blades the length of an Olympic pool can’t reach many wind-energy sites. Blade Dynamics fabricates its 160-foot, carbon-fiber blade in multiple pieces, which can then be transported by standard trucks and assembled at a nearby location. It’s a stepping-stone for 295-foot and 328-foot blades now being designed for offshore turbines. (Currently, the world’s longest prototype is 274 feet.) The colossal size should enable 10- to 12-megawatt turbines, double the generation capacity of today’s biggest models.

Wind Power Scale
Graham Murdoch

The Networked Solution

Smarter Turbines

Reducing the variability of wind energy could position it to compete as a stable source of power. General Electric’s new 2.5-megawatt, 394-foot-diameter wind turbine has an optional integrated battery for short-term energy storage. It also connects to GE’s so-called Industrial Internet so it can share data with other turbines, wind farms, technicians, and operations managers. Algorithms analyze 150,000 data points per second to provide precise region-wide wind forecasts and enable turbines to react to changing conditions, even tilting blades to maximize power and minimize damage as a gust hits.

The Hybrid Hail Mary

Man-Made Thunderstorm Power

Solar Wind Energy’s downdraft tower is either ingenious or ludicrous. The proposed 2,250-foot-high concrete tower will suck hot desert air into its hollow core and infuse it with moisture, creating a pressure differential that spawns a howling downdraft. “You’re capturing the last 2,000 feet of a thunderstorm,” says CEO Ron Pickett. The man-made tempest would spin wind turbines that could generate up to 1.25 gigawatts (though it’s designed to operate at 60 percent capacity) on the driest, hottest summer days—more than some nuclear power plants. The Maryland-based company plans to break ground in Arizona as soon as 2015, provided it can secure $900 million in funding—a large sum but perhaps not outlandish when compared with a $14-billion nuclear reactor now under construction.