Tag Archives: Solar Batteries

Boosting battery storage can lower utility bills — study

By Daniel Cusick, Environment & Energy Publishing

Adding energy storage to an already robust solar market in California’s multifamily housing sector could lead to significant utility bill savings for building owners and tenants, new findings from the Clean Energy Group and partner organizations show.

In a new 50-page analysis released last week, CEG, along with the California Housing Partnership Corp. and Center for Sustainable Energy, found that lower-income apartments provide a ripe opportunity for developers to improve the economics of solar by adding battery storage to such apartment buildings. “It essentially creates a new pool of savings, so if you were only doing efficiency and only doing solar, you’d get some savings. But if you add storage, you get significantly more,” said Lewis Milford, CEG’s president and a co-author of the report, “Closing the California Clean Energy Divide.”

The authors say the findings are especially relevant in light of California’s recent passage into law of the Multifamily Affordable Housing Solar Roofs Program, a $1 billion investment program to deploy solar technologies in affordable multifamily rental housing that is expected to extend the benefits of solar power to hundreds of thousands of lower-income Californians.

But solar access by itself isn’t enough, the report says. In fact, shifting policies around rooftop solar in some states, including California, could place owners and tenants of low-income housing at greater risk because the benefits of solar are highly dependent on strong net-metering programs. A number of states have reformed net metering in ways that sharply curtail the benefits of solar, resulting in higher, not lower, electricity bills.

Battery storage effectively reduces that risk, the authors say, by eliminating most of the demand-related charges that utilities pass along to owners of distributed energy systems like rooftop solar.

“Because batteries empower owners of solar PV systems to take control of the energy they produce and when they consume it, storage can deliver deeper cost reductions that can be shared among affordable housing owners, developers, and tenants,” the report states. And unlike stand-alone solar projects, which do little to offset demand-related charges, a properly sized solar system with storage can eliminate nearly all electricity expenses, resulting in an annual electric utility bill of less than a few hundred dollars in some cases.

Read full article from E&E

Related Article: Energy Storage Could Break Low Income Rooftop Solar Bottleneck (CleanTechnica)

Aquion installs storage for microgrid at California winery and farm

By Peter Maloney, Utility Dive

Aquion Energy and Ideal Power have teamed up to provide storage capability to a microgrid that enables a California winery and farm to be energy self-sufficient.

Aquion supplied its aqueous hybrid ion batteries for the project, connecting them with Ideal Power’s grid resilient 30-kW multi-port power conversion system as part of a microgrid at Stone Edge Farm, a 16-acre organic winery and farm in Sonoma County. The energy storage installation provides the farm and winery the capability for solar self-consumption, peak shaving and load shifting services.

The solar + storage installation is designed to provide energy for a number of buildings on the site, including the primary residence, offices and workshops. The grid-tied microgrid, developed by Wooster Engineering Specialties, is capable of islanding and operating autonomously and of generating enough energy that Stone Edge Farm is able to sell some of the energy back to Pacific Gas and Electric.  During daylight hours, solar PV provides energy for the buildings and charges the batteries. During nighttime hours and periods of cloud cover, the batteries provide energy for building loads.

Read full article from Utility Dive

Related: Aquion Energy’s AHI batteries and Ideal Power’s power conversion system bring energy independence and resiliency to Sonoma Winery (Press Release) – April 26, 2016

How California Blackouts Will Make Solar and Batteries A National Story

By Bill Roth, Triple Pundit

California again faces potential blackouts. This time it is tied to a natural gas storage facility called Aliso Canyon owned by Sempra Energy’s Southern California Gas. The site’s ability to deliver energy was crippled by a natural gas leak described as an ecological disaster comparable to the BP oil rig explosion. State officials worry that this key facility will not be able to deliver sufficient supplies to California’s natural gas generating plants during summer peak electricity demands.

Here’s how solar and distributed generation could become national news this summer. It is 7 p.m., and Los Angeles is blacked out. It’s the third day of a blistering heat wave made more intense by global warming. People cut back on their air conditioning in the first two days in response to public service announcements to “save the grid.” But on that third evening, it was still over a 100 degrees from the valley to the beaches. Everyone decided they had to get cooler. Collectively they only moved their thermostats back down just a couple of degrees. But that was enough. The increased draw of electricity overwhelmed the grid. It automatically shut down because it just could not produce and deliver any more electricity.

But across LA, there are customers with power. They have lights. Even more importantly, they have air conditioning. Customers flock to these businesses. Neighbors walk over to ask their solar-powered neighbor about how they still have electricity.

The press see a media opportunity. Camera crews show up in front of the homes and businesses that have electricity because of solar systems connected to batteries. They ask questions about cost and find that these customers are actually saving money too. Then the reporters turn to the camera and ask, “Could this be the next iPhone-like technology breakthrough that California creates for all of us?”

Read full article from Triple Pundit

Too Much Solar in California? Not If You Bottle It

By Lauren Sommer, KQED

The cost of solar power has plummeted in recent years, which has led to a renewable energy boom in California.

But there’s a big hang-up: solar energy doesn’t provide a 24-hour supply. When the sun sets, the power from solar farms drops off, just as California needs it most. That’s sparked new interest in technology that stores electricity. And the energy storage technology race is going far beyond your typical battery.

Solar Peaking

“Pretty much everyday, we hit peak output,” says Michael Wheeler, a vice president at Recurrent Energy in San Francisco, looking at a screen showing the solar farms his company manages. But earlier this spring, something happened that, at first, doesn’t seem to make sense.

It was the middle of the day, when one of the solar farms was cranking out electricity, and his company got a message. There was too much electricity on the grid. The electric grid managers were telling solar farms to shut down. “The project went from almost peak output to zero for about two hours,” he says.

This happens on sunny, spring days when there is plenty of solar power but Californians aren’t using a lot of air conditioning yet, so demand for power is low. The solar and wind power comes in on top of what natural gas power plants are generating. Because renewable energy production goes up and down with passing clouds and wind conditions, grid operators say they need the continuous supply from natural gas to make up for those fluctuations.

Shutting down natural gas would leave the power supply less stable. Many gas plants can take between four and eight hours to restart, once they’re turned off. As more solar farms come online, the pressure to shut them down on mild, sunny days is only expected to become greater. California plans to get 50 percent of its electricity from renewable sources by 2030.

Read full article from KQED

Related article: What will California do with too much solar? (KQED) – April 4, 2016

How Solar, Batteries and Time-of-Use Pricing Can Add Up to Value

By Jeff St. John, Greentech Media

There’s definitely a value to storing solar energy in batteries, and then discharging that energy to meet grid and customer needs. Measuring that value — and finding a way to share it between battery-equipped solar customers and their utilities — is a trickier matter.

Out in Sacramento, Calif., a long-running solar-storage pilot project has been testing out this interplay. The city’s utility, Sacramento Municipal Utility District (SMUD), has been working with startup Sunverge to align the operation of 34 battery-backed, PV-equipped homes with its needs to shave peak demand in late summer afternoons, when air-conditioning loads put stress on the grid.

SMUD is using critical peak pricing as its lever. Since 2012, the utility has been running an experiment with residential rate plans that charge extra-high prices during “critical peak period” days, in exchange for extra-low prices at other times. Some customers were offered the option of signing up for the plan — and others were automatically enrolled.

Read full article from Greentech Media

What’s Included in the Price of Your Home Battery System?

By Jeff St. John, Greentech Media

When it comes to opening the market for battery-backed solar homes, hitting the right price point will be critical. But getting the right combination of services will be equally important.

Tesla set the bar for low-price home energy storage in May, when it announced a $3,500 wholesale price for its 10-kilowatt Powerwall home battery system, with key partner SolarCity offering the unit as part of new solar installations. There’s been some confusion about final pricing, but Tesla CEO Elon Musk said in June that it’s targeting a purchase and installation price of about $4,000.

That’s a lot lower than the prices coming from competitors in the home solar-battery space. Take Sonnenbatterie, the startup that’s sold thousands of batteries for solar homes in Germany, and has launched a U.S. partnership with solar company Sungevity. The company is pricing its 4-kilowatt battery system for $10,000.

Read full article from Greentech Media

California’s Distributed Energy Grid Plans: The Next Steps

By Jeff St. John, Greentech Media

Last week, after a year of behind-the-scenes work and much public debate, California’s big three investor-owned utilities turned in their long-awaited distribution resource plans (DRPs). These DRPs are essentially blueprints for how Pacific Gas & Electric, Southern California Edison, and San Diego Gas & Electric are going to merge rooftop solar, behind-the-meter energy storage, plug-in electric vehicles and other distributed energy resources (DERs) into their day-to-day grid operations and long-range distribution grid planning and investment regimes.

Each California utility has created mapping tools that show how much capacity is available on each distribution circuit for new DER interconnection, for instance — something that could be very useful for distributed energy developers. All three utilities have also agreed on a common set of measures for how DERs could help shore up grid capacity, increase reliability, serve system-wide needs, and otherwise stand in for costly utility upgrades. And each has laid out how it plans to fold these DRP methodologies into their general rate cases (GRCs), the once-every-three-years process that determines how much each can charge its customers for its capital and operating costs for the coming years.

Many questions remain about how to determine which combination of DERs will meet the least-cost models that utilities use to rank their distribution grid upgrades, and what kinds of new capabilities grid-supporting DERs will need to have to serve as replacements for utility investments. There’s also much uncertainty about how DERs serving as stand-ins for grid infrastructure should be paid for, and how their costs and benefits should be shared. These issues are of major interest for solar-storage combinations from SolarCity and Tesla, SunEdison and Green Charge Networks, Sungevity and Sonnenbatterie, and SunPower and partners Stem and Sunverge, which see an opportunity for earning grid services revenues as stand-ins for distribution grid investments. They’re also important for the commercial building and residential energy management platform providers looking for ways to tap California’s emerging opportunities for distributed demand response.

These costs and values wouldn’t just flow from utilities and their customers to DER providers—each utility’s DRP asks the California Public Utilities Commission (CPUC) for permission to spend lots of money on beefing up their own systems to enable their visions. Southern California Edison alone is estimating its DRP-related capital expenditures could add up to $347 million to $560 million over the next three years, for example, and PG&E and SDG&E will also be seeking new funding, though they haven’t yet specified how much.

All three DRPs add up to nearly 1,000 pages, which makes it hard to summarize all the next steps they contain, but here are a few highlights of the challenges to come.

Read full article from Greentech Media

Related articles: How California’s biggest utilities plan to integrate distributed resources (Utility Dive)