Showing posts with label DR. Show all posts
Showing posts with label DR. Show all posts

Sunday, December 21, 2014

Reposit Power : Store Solar Energy & Trade it with Grid

A Canberra-based company is to introduce new technology that it says could help turn electricity markets on their head – by allowing households to buy and sell electricity on the market.

The buying and selling of electricity has hitherto been the province of large or specialised companies such as electricity retailers. But Reposit Power says that homes and businesses can and should be able to trade electricity with the help of battery storage, and production facilities such as solar panels.


Reposit Power plans to install battery storage in six homes around Canberra to run a six-month pilot of its technology, known as GridCredits. The Australian Renewable Energy Agency is contributing $445,000 to the $900,000 project.

Reposit Power says GridCredits is a world-first energy storage program that will put consumers in the driving seat and will "transform the grid forever."

Spokesman Luke Osborne says the technology will allow households to "buy low and sell high" – adding a new layer of possibilities to homes that have solar and storage. He says this will enable some households to virtually eradicate their bills and still remain connected to the grid by doing what the retailers do – maximising their earnings on the market.


"A lot of what retailers do is buying services from peaking power stations. Consumer with storage and solar panels can provide the same services themselves," Osborne told RenewEconomy in an interview.

"What we are doing is when it makes sense – households can be a seller, and then buy electricity at a low price."

Reposit Power is interested in using similar technology for wind farms and solar farms and for large businesses. "This is the alternative to going off-grid – households can be energy independent, at the same time as making the whole grid cleaner," Osborne says.

"Networks should be a platform for trading and exchange of electricity, so tariffs should be structured to encourage this, not to prevent it, or that will accelerate the death spiral of the grids.

"This is about households being able to go head to head with the major companies."



Reposit Power hopes to be able to broaden its rollout by mid next year, when this initial program is complete, and when it has convinced the Australian Energy Market Operator that households or businesses can be a "reliable source of power", as AEMO requires.

ARENA CEO Ivor Frischknecht said the new technology would allow consumers to gain more value from their rooftop solar PV installations. He said that one in five houses now use solar power.

"This substantial rise has made it vital to find solutions to better manage how residential solar systems operate in our electricity grids," Frischknecht said.


"Reposit's GridCredits system can control and store solar energy. This gives consumers access to their own power overnight and at peak times, reducing their demand on the grid.

"It also allows energy to be sold back into the grid by placing bids into the market, turning residential properties into micro power plants."

Frischknecht said that storage would help network operators manage demand more effectively by delivering stored power into the grid at peak times, and Reposit's technology will also help smooth out the variable delivery of solar energy.

This in turn would allow more renewables to be connected to the grid.

Reposit Power was co-founded by energy industry veteran Dean Spaccavento and scientist Lachlan Blackhall. The company says the two "shared a vision for allowing consumers to trade their electricity while contributing to a safe and cost-effective grid."




Source: Renew Economy

Saturday, November 29, 2014

When batteries beat traditional power



Battery storage is usually seen as being a handy adjunct to help renewable energy square up to traditional power plants. But on frequency regulation, at least, it seems batteries may actually be better than the generation sources they are helping to supplant.

That, at least, is the consensus emerging from early operating experience at Europe’s largest commercial battery power plant, the 5MWh lithium-ion facility that WEMAG has commissioned from Younicos in Schwerin, Germany.


“Whereas coal-fired and other thermal plants typically take up to 30 seconds to adjust production up or down, and then just hit the neighbourhood of where they are supposed to be, batteries react within milliseconds,” explains Philip Hiersemenzel of Younicos.

The fact that batteries might beat traditional power plants for frequency regulation has long been touted as a big selling point for battery storage and has already helped sell projects in the US.



Now the performance of WEMAG’s installation is strengthening that business case.

As well as being able to respond to frequency shifts more quickly and accurately, says Hiersemenzel: “The second reason batteries are better suited is that they don’t require CO2 emissions to adjust the frequency.”


No must-run capacity

Furthermore, he says, batteries do not create any ‘must-run’ capacity. In other words, they don’t need to remain operational when not being used for frequency regulation, reducing overall power generation.

This can have a significant impact on carbon emissions. Younicos says most thermal power plants need to run at around 70% of total capacity just in order to provide decent frequency regulation, and in German coal-fired plants the level is about 90%.



“This creates an overall must-run capacity of 25GW in Germany alone,” Hiersemenzel states; “25GW of coal and nuclear power must be fed into the grid at all times.”

Natural gas plants are more flexible and can provide frequency response while running at as little as 40% of capacity. “But they’re also more expensive than coal,” says Hiersemenzel.

“Since we’re already competitive against the marginal cost of a completely written-down coal plant, imagine how competitive we are against a new gas plant.”

At the WEMAG plant’s grid-connecting ceremony a fortnight ago, Younicos’s chief technology officer Clemens Triebel pointed out that the facility was essentially providing the same level of frequency control as a 50MW conventional turbine.

Avoiding economic impact

“Coal-fired power plants can only use a fraction of their output for control power,” he said. “This blocks space in the grid, increasingly forcing wind and solar generation to be taken offline. Our battery park avoids this economic impact.”

The WEMAG battery plant features Samsung SDI lithium-ion cells and serves a grid area where 80% of power already comes from wind and solar generation.

It was backed by EUR€1.3m from the German Environment Ministry’s innovation programme and will compete on the primary frequency regulation market, Younicos says.

Younicos expects this capability alone will provide a positive return on investment for the plant. But the facility is also due to earn its keep in other ways. One is by replacing WEMAG’s current ‘black-start’ generators.

“Like all regional grid operators, WEMAG keeps diesel gensets solely for the purpose of black-starting the grid after a power cut,” says Hiersemenzel.

“Such cuts typically happen not so much because of electrical problems in the grid, or even renewable generation, but for much more profane reasons: a car hitting a power line, say.”


Using batteries instead of gensets

When this happens, the grid operator has to coax its power stations back online using smaller genset units. Only WEMAG should now be able to rely on its battery plant instead, and save the expense of maintaining gensets.

The facility, which has been praised by the German Vice-Chancellor and Energy Minister Sigmar Gabriel, and Mecklenburg-Western Pomerania’s Minister-President Erwin Sellering, could also be used for other auxiliary services, such as voltage control.

In fact, for another Younicos project, the 6MW, 10MWh Smarter Network Storage plant being built for UK Power Networks in Leighton Buzzard, UK, batteries will be used for at least six different functions, including peak shaving, and possibly all at once.

Trying to squeeze that much functionality out of a single battery plant will probably cut the lifetime of the batteries, Hiersemenzel points out.

But it is the operator’s choice whether to try to stretch the lifespan of their investment or get the most value possible out of it over a shorter period.

For now, what the WEMAG plant and other early grid-connected battery facilities are showing is that energy storage is no longer about making renewable-laden grids as good as traditional ones; it is about making them better.



Written by Jason Deign

Source: Energy Storage Report

Sunday, November 9, 2014

Energy Storage Will Soon Be in Every Home


As solar energy becomes more common we may need energy storage to help stabilize the grid. Image source: SolarCity


Within the next 25 years every home will not only be connected to the electric grid, they'll have their own energy storage system that will keep the lights on in a power outage and help make energy more efficient for everyone to use.

That may seem like a wild concept but some of the most forward thinking companies in energy predict that energy storage will soon be accompanied with every solar energy system in the U.S. With as fast as the residential solar industry is growing it's only a matter of time before a battery box may be hanging in your basement.

Storage solutions are here
Companies have been testing storage solutions for years but they're finally starting to see the light of day in the consumer market. SolarCity (NASDAQ: SCTY ) has launched an energy storage solution for the home and a commercial offering with the help of Tesla Motors(NASDAQ: TSLA ) . The system isn't meant to be a way to go off-grid but it'll keep the refrigerator working and the lights on in a power outage.

SunPower (NASDAQ: SPWR ) has introduced a similar small storage system and is offering it in new homes built by KB Home (NYSE: KB ) . Like SolarCity, the goal isn't to allow homeowners to go off-grid, but storage will instead be used for backup power in case of emergencies.



Inverter maker Enphase Energy (NASDAQ: ENPH ) jumped into the game this week with an AC battery that's meant to be an easy to install addition to residential and commercial solar projects. Enphase is making the product modular so more than one battery can be put in a home, and it's supposed to allow for smarter energy storage for nighttime or high consumption usage instead of just drawing energy from the grid.


SolarCity's commercial energy storage solution, built by Tesla Motors


Why energy storage is the future of energy
These energy storage solutions may seem like small steps but they're part of a much larger move into making distributed energy production smarter and more efficient. Right now, homes and businesses that have solar systems are pushing power to the grid or drawing from the grid at unpredictable times, forcing utilities to run spinning reserves and putting strain on the local distribution network. If built properly, even small energy storage systems can smooth out the load on the grid and make the entire network more efficient.

As the cost of solar power comes down the industry will grow to nearly every home and I think these energy storage solutions will become a standard offering as part of a solar system. As that critical mass is reached, storage will become even more important as a way to stabilize the grid, even with small storage systems. That's why I think it's only a matter of time before we all have energy storage systems.

Where to make money in energy storage
Companies are rushing to get into energy storage but the winners may not be who you think. Batteries are already a commodity product around the world and most energy storage systems are using lithium ion batteries that are essentially plug and play in the market.

Instead, the companies integrating batteries and solar systems will be the big winners long term. For example, SunPower's energy storage solution is also the solar system's inverter, turning DC solar electricity into AC power we use in the home. This full solution is where the value is added, not just in the batteries.

SolarCity is doing something similar, although it isn't yet an inverter manufacturer. But as Tesla Motors builds out its Gigafactory and batteries become a more common offering I would be surprised if they didn't start making inverters with energy storage included.

This is also the strategy Enphase Energy is taking, being the point of contact for the grid, energy storage, and the solar system.

Energy storage will be another important tool in the kit for solar companies in the future and those who can integrate it effectively will be a step ahead of competitors. As SunPower and SolarCity add energy storage look for them to continue to be big winners in this space but keep an eye on Enphase Energy. It is moving into more of an energy management role and that's a better way to add value to this space than just supplying a commodity product like inverters to the market.

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Source: The Motley Fool

Saturday, April 26, 2014

Tesla Motors Shows Off China's First Solar Supercharger

Tesla Motors Shows Off China's First Solar Supercharger

Tesla's Solar Supercharger in China

Tesla's Solar Supercharger in China

InsideEVs Is Always On The Scene


InsideEVs Is Always On The Scene

At Auto China 2014, Tesla Motors took the opportunity to showcase its first solar Supercharger in Beijing
"At the recent delivery ceremony of Tesla's first batch of Chinese orders in Beijing, two PV charging systems caught the eyes of the guests. The system was requested by Tesla Motors, and designed and manufactured by Hanergy Solar Group. Hanergy thin-film flexible PV system was Tesla's first choice for the first PV Supercharger station in China."
Though the solar Superchargers seen above are in Beijing, China, Tesla Motors opened a similar Supercharger site in Shanghai, China.
At the Model S delivery ceremony, Tesla Motors CEO Elon Musk commented:
"In the future, Tesla will work with partners to build supercharger network. The first charging station in Beijing was built in cooperation with Hanergy Solar Group. Tesla will continue to invest in the construction of superchargers in China, aiming to quickly expand the network."
As for those solar carports/Supercharger, Hanergy Solar Group states:
"Hanergy Solar Group will deliver two solar carports, each in Beijing and Jiading, Shanghai. The Beijing carport, a mobile carport designed to be assembled and transported, adopts Hanergy's GSE flexible thin-film solar modules. The Shanghai carport will be a fixed structure, and adopts Hanergy's MiaSole CIGS high-efficiency modules. The first phase of both carports has been completed."
But wait, there's more in the work.  Musk says that Tesla is already in the process of building 7 Supercharger networks in China, all of which will be solar-powered units with energy storage systems..  They'll be open 24 hours a day, 7 days a week.  The first of those networks will be in Beijing and Shanghai.

Model S in China
Model S in China


Locations Of China's First Two Superchargers
Locations Of China's First Two Superchargers


Back to Hanergy's solar carports:
"The PV charging system by Hanergy Solar Group protects vehicles like ordinary carports while converting sunlight into electricity utilizing its designated rooftop. At the same time, the system charges the electric vehicle through its energy storage system. The system uses the CIGS thin-film PV technology, the most advanced in the world. With conversion rates peaking at 20.5%, this technology offers light weight, flexibility, excellent low-light performance and advanced packaging. More importantly, no fixed column is required, which significantly reduces the cost. The carport is mobile, beautiful, modern in appearance, and a perfectly integrated to city surroundings, providing convenient and fast charging services to electric car owners."
Lastly, Ms. Zhang Qingliang, Vice President of Hanergy Global Solar Power and Application Group, stated:
"We are pleased to be the one to provide Tesla the first batch of solar powered Supercharging stations in China. As a technology-driven company, Hanergy has been actively exploring ways to utilize its thin-film photovoltaic technology to provide solutions through technological innovation and cross industrial integration. We have been working with multiple domestic and foreign automobile manufacturers to integrate solar, and is also researching on energy storage, photovoltaic car roof and other solar-automobile applications."
China's dependence upon coal for electricity is what convinced Tesla Motors that all Superchargers in China will rely on the power of the Sun and be supplemented by energy storage systems.



Source: Inside EVs

Sunday, February 23, 2014

DIY ESS Kit - General Presentation



After a year of successful Energy Storage at home, here is my very first Presentation of the system I designed from ground up ...



Here are the slide I made and commented for this video:















Visit my dedicated website here: http://www.diyesskit.com


Sunday, January 12, 2014

DIY ESS - Winter with some little sun

Here is a 7mn video shot last week end, in which you can see the automatic behavior of my DIY ESS during a mid day low sunlight day; The energy stored during the night at half rate is pushed in our house electric network to compensate our use



As usual each Wattson displays on the left, Solar + ESS Power, and on the right, home Net Power




Sunday, November 17, 2013

DIY ESS - LiFePO4 CALB CA180FI Voltage Check

As I was moving my ESS upstairs one month ago,  and split the CALB CA180FI battery pack in pairs, I shot another small video doing a cell voltage check, and as usual, they are all in balance ...



The ESS battery pack is now charged and discharged fully in winter, using the low cost electricity provided by our energy provider TOU - Time Of Use - to charge, and discharging into our home grid during peak hours, mostly for heating, cooking and lighting



Thursday, October 24, 2013

Winter: Charging during the night, using the Stored Energy from the ESSand Solar during the day

Winter: Charging during the night - off peak rate TOU -, and using the Stored Energy from the ESS and Solar during the day to shave peaks and compensate home usage as much as possible 




The US DOE publishes a website to track Energy Storage Projects


"The DOE International Energy Storage Database provides free, up-to-date information on grid-connected energy storage projects and relevant state and federal policies. All information is vetted through a third-party verification process."


You can refine your search with Technology Type, Location, etc 


For example: with Battery, in France I found two Porjetcs:
- One in Brittany, based on Sodium Sulfur Batteries, providing 1GW for 7:12 :

and a Second One in French Riviera, Nice, based on Lithium-ion (what exact technology of li-ion ?), providing 1GW also, but for 30mn only

Maybe I should try and add my DIY ESS
It is small, BUT, if 500 families install this kind of system at home, they would provide also 1GW of power for several hours, captured from solar or/and wind, produced locally ...


Saturday, August 31, 2013

DIY ESS - Follow its activity with 3 Wattson units

See my ESS in action at home with 3 Wattson units, displaying Home Usage, Generation (from Solar + ESS) and Net Usage

Mostly shot during the evening diner cooking with a rice cooker on (400W),  a stove (1500W on and off), some lights, etc

A good example of peak shaving & smoothing, done at home :-)







and the Power graph shows this activity in the evening (peak)

and the Energy graph

Close up / Focus on this period: The Usage is almost completely covered by the Generation (Solar & ESS mostly), and Energy required from the Grid pretty small 






Wednesday, August 28, 2013

GE Energy Storage - Energy Management for the Modern Age

General Electric's vision of Energy Storage:


"Access to cost-effective and reliable power is essential in today‘s world. For some users, access to highly reliable power that is available 24 hours a day, seven days a week, is critical. Durathon Batteries are a safer, reliable and low maintenance technology that provide effective back-up power for users while saving them money on their energy bill.




In contrast to other backup applications, the Durathon Battery Energy Storage System can reduce a users’ energy bill while waiting for the grid to fail. Utilizing Durathon Battery’s superior cycle performance, the system reduces a user’s daily peak demand load by peak shaving, or smoothing out their energy consumption. For many users, demand response charges can be a significant component of their electricity costs and leveling energy loads across a day provides real savings. When the grid falters, Durathon Batteries are ready to provide hours of backup power supply.


For owners looking to integrate renewable sources into their building’s power supply or roll out electric vehicle charges, the Durathon Battery Energy Storage System is the ideal choice. Durathon Batteries have an extremely small footprint and require minimal maintenance, ensuring that the system is cost effective to install and operate. With the capability to be fully integrated into an existing building energy management system, Durathon Battery technology’s superior storage capability helps ensure renewable power supply is balanced with building loads, and congestion and peak demands caused by excess EV charging are decreased.




Micro-Grids
Micro-grids, whether located on a true geographical island or simply isolated within a building complex, present unique energy challenges such as high diesel costs, renewable integration or the need for black-start capability. For such applications, Durathon Batteries provide smart energy management options to maximize efficiency and lower costs.

Due to the lack of alternate energy sources, micro-grid operators often rely heavily on diesel generators, despite expensive operating costs and slow response times. Most generators are not run at maximum efficiency, which leads to cost and maintenance issues. By using Durathon Battery’s superior cycling capacity in hybrid mode, it is possible to increase the fuel efficiency of the micro-grid by up to 40%, reducing costs and resource usage through better management of fuel deliveries. Durathon Battery technology also provides backup power and black-start capability to get the micro-grid back up and running if the generator fails.

Durathon Batteries’ scalable design means more modules can be added to the micro-grid for renewable integration. Its high-energy capacity also ensures that renewable power is used effectively and efficiently."



Source: GE Energy Storage

Japan contracts two massive Battery Storage Systems to balance Wind, Solar PV load

Japan's Ministry of Economy, Trade and Industry (METI) has chosen three companies to install two large-scale battery systems in the northern part of the nation to support the expansion of wind and solar on Japan's electric grid.


Sumitomo's redox-flow battery will occupy 
a new 5,000 square meter facility in Hokkaido


Through the Large-scale Storage Battery System Demonstration Project, Hokkaido Electric Power Inc. (Sapporo, Japan) and Sumitomo Electric Industries Ltd. (Osaka, Japan) will jointly install a 60 MWh redox-flow battery on the island of Hokkaido. Additionally, Tohoku Electric Power Co. Ltd. (Sendai, Japan) will install a 20 MWh lithium-ion battery in the Tōhoku region.

“This project is Japan’s first effort to introduce large-scale storage batteries in electricity grids, and METI aims to rapidly acquire the necessary technology and know-how so as to utilize such batteries in electricity grids in a specific manner,” declares METI in a press statement.



Projects to study frequency variation, supply/demand balance

The two projects were chosen via a public solicitation held in April 2013. Tohoku Electric Power's lithium ion project was chosen to address the issue of frequency variation, and Sumitomo's redox flow battery has been chosen to look at the technology's ability to balance supply and demand at times when demand falls.

The Tōhoku project will coordinate the lithium ion batteries to operate with conventional power generation while utilizing the batteries as much as possible to adjust frequency, suppressing the impact on battery life.

In the Hokkaido project, the companies will not only look at how well the batteries address varying electricity output from wind and PV, but also at developing technology to control and manage the battery system. METI notes that redox-flow batteries can be used to deal with supply/demand balance over a long period of time.

METI aims for the projects to increase the capacity of the supply-demand adjustment function by 10% in each region.





Sumitomo to develop battery based on results of tests

Sumitomo and Hokkaido Electric plan to complete installation of the redox flow battery by the end of 2014, and carry out verification tests over the next three years. The massive battery system will occupy two floors of new building roughly 5,000 square meters in size, with the electrolyte tank on the first floor, and the cell stack and heat exchanger on the second floor.

The battery system will have a storage capacity of 60 MWh, and a rated output of 15 MWh.

The company notes that redox flow batteries can be used for a wide range of applications, including addressing frequency variation. Based on the results of the tests, Sumitomo plans to offer a redox flow battery with improved performance.






Source: Solar Server

2013-08-09 | Courtesy: METI; Image: Sumitomo | solarserver.com © Heindl Server GmbH

Monday, June 3, 2013

Lessons Learned From SolarCity’s First Home Energy Storage Installs

SolarCity has reservations for at least 65 energy storage systems in California, according to the latest SGIP summary. (SGIP is California's Self Generation Incentive Program, which provides a subsidy for fuel cells, biogas digesters, energy storage, etc.) In 2009, SGIP started offering credits of $2 per watt for energy storage systems that can store power from an eligible on-site generation system and discharge it at rated capacity for a four-hour period.

SolarCity promotes its system as a way for homeowners to have backup power in case of utility outages. According to the company, there are more than 100 pilot projects under contract. Most of the SolarCity projects in the SGIP spreadsheet are 5 kilowatts in size, using batteries from cousin company Tesla Motors.

Eric Carlson, Lead Architect of Energy Systems at SolarCity, spoke at last week's Energy Storage Association and shared some of the firm's experience in its first 100 energy storage installs.

Carlson said, "We think storage will be absolutely necessary to enable the deployment of solar across the grid at extremely high penetrations," adding, "When you combine solar and storage, you have a dispatchable asset at the load."

SolarCity has built two community deployments using a 9-kilowatt, 18-kilowatt-hour lithium-ion battery, but Carlson notes, "There is no magic formula for proportions -- it depends on usage at the site." Earlier installations used lead acid batteries.



SolarCity's Energy Systems Architect noted some lessons from the field:- The storage system typically gets installed inside a garage. It turns out that people are not happy in turning over precious garage space to a battery and a protective bollard. Carlson said, "Customers hated the space being used in their garage." The new Tesla-labeled 10 kilowatt-hour lithium-ion battery bolts on the wall and mitigates some of the space issues.
- A new acronym, NIMG, stands for "Not in my garage."
- "Interconnection costs and requirements need to reflect the true cost of of the interconnect. Requirements need to be consistent, codified and predictable across multiple regions." The process needs to be streamlined and over-the-counter.
- "We need harmonized tariffs for combining PV and storage."
- "We need outdoor-hardened devices that are low- or no-maintenance."
- Installing solar jointly with energy storage, either where storage was retrofitted or installed with solar, reduces costs and brings the net cost of storage down.



As Jeff St. John reported, "Battery backup could really help solve some of the larger-scale problems associated with connecting lots of intermittent solar power to the grid. Energy storage could help mitigate the distribution grid voltage sags and surges that can occur when clouds pass over neighborhoods with lots of rooftop solar, for example. It could also help shift stored solar power to cover peak loads that may occur slightly later in the afternoon than solar’s peak production times."

Calculations by Sam Jaffe, now of Navigant, found SolarCity offering the systems at a cost of $2,000 per kilowatt-hour, which would add up to $40,000 for a 5-kilowatt system. Adding the ITC benefits to the SGIP incentives cuts the cost of the system to $800 per kilowatt-hour, Jaffe estimated. With time-of-use benefits added to that, “The homeowner is paying about $6,000 for the benefit of having reserve power during short-term blackouts, which is roughly equivalent to what an advanced hard-wired generator would cost,” he said.

Tesla and SolarCity aren’t the first to try out batteries to backup solar power. Japan’s Panasonic and Hitachi are installing home-based, solar-backed energy storage in pilot projects. In the United States, battery startup Xtreme Power is eyeing smaller-scale solar-backed applications to match their big, substation-sized grid batteries, and utility AEP is working with S&C Electric Co. on “community energy storage” systems that back up grids at the neighborhood level. General Electric just inked a partnership to integrate its nickel-salt Durathon batteries with Arista Power’s power-balancing system to back up solar and wind power.

One interesting note on the Tesla-SolarCity effort is that the two are offering the systems for lease in California, according to SolarCity’s website. That could open the door to SolarCity managing the batteries en masse, to maximize the value of the energy they’re storing.

There is always a policy piece with energy storage. SolarCity's Carlson emphasized, "We need to harvest multiple income streams with energy storage. We need policy to align customer benefits with grid operation and wholesale market value."




SolarCity's SGIP reservations

SolarCity PV Storage Reservations



Source : GreenTech Media

Wednesday, May 29, 2013

USA New Energy Storage Bill : Home owners can install their own ESS and get 30% off in tax credit !



US senators introduce energy storage bill

U.S. Senators have introduced a Storage Technology for Renewable and Green Energy Act for 2013. This Act, also known as the STORAGE Act, will promote the deployment of energy storage technologies in the U.S. All storage technologies are supported by the bill.




I read in this article that Home Owners could get a 30% tax credit building their own DIY ESS, which I think is great :-)

"Home owners can also install their own storage solutions. The Act will provide for 30% tax credit for homeowners for on-site energy storage to store off-peak electricity from solar panels for use when needed during peak hours."

Maybe some americans could be interested in my DIY ESS since they could pay only 70% of its cost ... which should be close to 3,000 USD after incentive (maybe less since many components can be found in the US). Pretty cool, things are starting to move...


My DIY ESS is doing exactly this, automatically: http://diyesskit.blogspot.com




Source: PV Magazine

Wednesday, May 15, 2013

Fighting Blackouts: Japan Residential PV and Energy Storage Market Flourishing

San Diego, CA -- In the past, a PV system with battery storage was associated with the off-grid system — not connected to the utility grid. The battery stores the energy produced by the PV system and when the sun goes down, electricity is drawn from the battery. In Japan, the battery became attractive to store electricity from "the grid," to reduce electricity bills.

After the devastation of the Tsunami and nuclear meltdown in Mach 2011, Japan became painfully aware of the importance of both safety and maintaining a steady supply of electricity. The combination of a PV system and battery storage gives consumers the ability to produce, store and supply electricity throughout the day at their own home for power outages and emergencies. However, the system can bring economic benefits — electricity bill reduction — during normal days.

Like California, utilities in Japan offer Time-of Use (TOU) rates. How homeowners can reduce electricity bills can be illustrated by using Tokyo Electric Power Company’s (TEPCO) current (non-summer) TOU rates for all-electric homes with a PV system.

- Purchase and store electricity from the grid at off-peak hour (11 pm – 7 am) at ¥11.82/kWh [US $0.12]

- Sell PV-generated electricity to the utility at the FIT premium rate of ¥38.0/kWh [US $0.38]

- Use PV-generated electricity during day time, otherwise paying at ¥30.77 (10 am – 5 pm) [US $0.31] and use stored electricity between 7 and 10 am and between 5 and 11 pm, otherwise paying ¥25.2/kWh [US $0.25]




With the battery storage, PV homeowners can ultimately buy electricity at the lowest rate (¥11.82/kWh or $0.12/kWh) and sell at the highest price (¥38/kWh or $0.38/kWh).

The key domestic PV makers, Panasonic, Kyocera and Sharp, all now offer lithium-ion battery storage along with a PV home system to meet consumers’ demand. Their goal is to move beyond PV and expand into a total Home Energy Management System (HEMS3) arena.

Kyocera started offering PV plus lithium-ion battery storage to homeowners in early 2012 with a target of selling 10,000 units from April 2012 to March 2013. Panasonic also released home battery storage systems that can be connected to Sanyo’s (now Panasonic) HIT PV system. The battery has a capacity of 4.65 kWh and is priced at ¥1.218 million MSRP [US $11,984].

In April, Kyocera released the largest residential lithium-ion battery in Japan. The battery has the capacity of 14.4 kWh, which is priced at an MSRP of ¥4.45million [US $43,784]. This large capacity allows it to power a home refrigerator, TV, computers, lights and cell phone chargers for up to 24 hours.

Kyocera has teamed up with Rakuten, Inc., which operates the nation’s largest internet shopping site, to offer a PV system (poly-Si) and a lithium battery (7.2 kWh) set for homeowners at an affordable price. Rakuten provides options with different sizes of PV systems with the battery, and installed system price (after tax) varies from ¥2.94 million ($29,730) with a-2.28 kW system to ¥4.168 million ($42,153) with a 6.27-kW system. These systems are installed by one of the nation’s largest installers, Nippon Ecosystem, which is part of Itochu Corp.

Residential battery systems remain expensive to average homeowners. To solve this issue,One Energy Corp. has just begun the nation’s first residential energy storage leasing service. Like SolarCity or SunRun’s PV leasing service in the U.S., this requires zero upfront payment to homeowners. The company is a joint venture between Orix, NEC and Epco. NEC provides lithium batteries, whose technology is used for Nissan Leaf electric vehicles.

Besides the energy storage leasing service, One Energy also offers “Yanekari (PV rooftop space leasing)” service. A homeowner can lease a storage system with 5.53 kWh of capacity at between ¥3,045 ($31) to ¥5,145 ($52) a month from One Energy while offering the roof-space to One Energy, making a monthly revenue of ¥2,500 ($25). The image below illustrates how a customer could use an energy storage system to offset the high cost of purchasing energy during peak times.




One Energy currently offers this leasing service in the TEPCO region only and is planning to expand to the Kansai region by the second half of this fiscal year and eventually expand nationwide.

NEC started mass production of residential storage systems in February. Besides partnering with One Energy, the company sells home batteries directly to homebuilders and building material distributors with the goal of selling 15,000 units during this fiscal year.

The company stated that PV homeowners will start storing PV electricity in batteries even more as the FIT rate gets lower in the future, creating a more self-sufficient and less grid-dependent environment.

It is declining, but the national government provides upfront, capacity-based rebates (¥15-20/kW) and a net FIT of ¥38/kWh on excess electricity generation for 10 years) for PV home systems. The government also currently provides a subsidy for lithium-ion battery storage for homeowners. The subsidy is one third of the installed system cost or up to ¥1 million ($10,823).

The hot and humid summer is approaching in Japan. Some of the nation’s utilities have just raised electricity rates and many of them will request that consumers limit and/or shift electricity consumption from peak to off-peak to control raising fossil fuel cost caused by the shutdown of nuclear power plants. With PV + battery systems, homeowners are moving to take energy matters into their own hands in defense against rolling blackouts and rising electricity bills.

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