Category: News

AES and KIUC break ground on Hawaii’s largest solar-plus-storage system

AES Distributed Energy (AES DE), a subsidiary of AES Corporation, and nonprofit transmission firm Kauai Island Utility Cooperative (KIUC) have broken ground on a 28MW solar and 100MWh five-hour duration battery energy storage system in Kauai, Hawaii.

The Lāwa’i Solar and Energy Storage Project, the largest hybrid solar and storage project in Hawaii, will be located on former sugar land between Lāwaʻi and Kōloa, on Kauai’s south shore. It will provide 11% of KIUC’s generation capacity and increase the portion of renewables in its mix to 60%.

The price will be US$0.11/kWh, which is significantly below the cost of diesel generation, said KIUC’s president and chief executive, David Bissell.

“This will not only provide downward pressure on rates, but also helps us avoid the use of 3.7 million gallons of diesel each year,” he added.

Last October, AES announced it would be using SunPower’s scalable Oasis Power Plant platform for the solar plant.

The battery system will also improve the island’s grid resiliency, providing dispatchable energy from the solar system, with the ability to deliver consistent peak power output for up to five hours outside of daytime hours, alongside power production going straight to the grid during daytime hours.

Woody Rubin, president of AES DE, said: “AES has had a presence in Hawaii for more than 25 years, and this first-of-its-kind project demonstrates our continued commitment to the state’s vision of a cleaner energy future. This innovative project will help reduce Kauai’s reliance on fossil fuels while generating clean, reliable and affordable energy.”

Hawaii has a goal of reaching 100% renewable energy by 2045 and solar and storage combinations have been a major focus already. The Hawai‘i Public Utilities Commission last year approved two new programmes expanding its customers’ abilities to install rooftop PV and energy storage systems. Similarly, in 2016, SolarCity chose Tesla, which later acquired SolarCity, to supply a 52MWh utility-scale energy storage system, which will make the output of a solar farm in Hawaii dispatchable.

Meanwhile, the US Navy is building a 44MW solar power plant with energy storage, also on Kaua’i, while ‘intelligent’ commercial storage provider Stem is aggregating customer systems into a 1MW ‘virtual power plant’ on another island, O’ahu.

Scale of such projects is consistently growing. For example, this week Australia also saw its first large-scale, grid-connected solar-plus-storage system come online, having been built by Conergy.

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ROUNDUP: Redflow ‘large scale battery’, KACO new inverter, PetersenDean picks SolarEdge/LG Chem

Redflow creates 450kWh systems from smaller units

21 February 2018: Australian flow battery manufacturer Redflow, which has just begun implementing mass production techniques at its factory in Thailand, has now created a ‘large-scale battery’ (LSB) with a capacity of 450kWh.

The company is known for its 10kWh ZBM2 zinc bromide flow batteries, which it mostly sells to commercial and industrial (C&I) customers, touting advantages including cheap and recyclable plastic parts which it claims will lower the cost of both production and purchase.

Redflow said that company founder and former CEO Simon Hackett has installed a Redflow LSB at property he owns in Adelaide, underneath a 50kW solar array, linked to another 20kW solar installation.

The LSB uses 45 separate ZBM2 batteries, along with six 12kW Victron Quattro 48/15000 battery inverter/chargers in what Redflow described as both a “simplification” and the addition of ‘plug and play’ capabilities to the product’s installation process.

“Although we initially purchased a large industrial AC inverter with the LSB, it lacked the monitoring, logging or control systems to let it interact with our on-site solar. While we could charge and discharge our large battery ‘manually’, we couldn’t integrate it with the building, without an expensive consulting project to develop a bespoke third-party control system,” Hackett said, before Redflow settled on combining the system with a Victron Energy CCGX controller unit.  

KACO introduces new battery inverter

21 February 2018: Germany-headquartered solar inverter manufacturer KACO has unveiled a new 50kW device that the company claims is designed with versatility in mind, including compatibility with batteries from a range of providers.

The blueplanet gridsave 50.0 TL3-S is a bi-directional inverter with a claimed efficiency of 98.5%. Aimed at the commercial and industrial (C&I) and utility-scale markets, KACO said it is compatible not only with lithium-ion batteries, but potentially other types as well.

The device can be operated in parallel on the DC side, connecting a high-capacity battery to several inverters. This allows for high system availability – different batteries could perform different tasks, or be scheduled to do so at different times – and high efficiency, the company claimed.

The system can also be installed in parallel on the AC side and safely installed outdoors. It will be officially launched at Energy Storage Europe next month in Germany.

US contractor PetersenDean selects SolarEdge, LG Chem for home energy push

21 February 2018: PetersenDean, a major home improvement contracting company in the US, has selected SolarEdge inverters and LG Chem batteries to create what the company calls “an affordable path to solar ownership and energy storage”.

PetersenDean Roofing & Solar apparently installs approximately 2,000 solar PV systems and roofing solutions each month. The installation subsidiary will offer customers LG Chem’s 9.8kWh Residential Energy Storage Unit (RESU) 10H battery systems, along with a complete inverter solution from Israel-headquartered SolarEdge which includes module-level power electronics, integrated into the company’s StorEdge energy management platform.

LG Chem batteries were among the first to be announced as compatible with SolarEdge technology, along with Tesla’s Powerwall.

“Both of these companies’ commitment to technology, coupled with efficient and high-quality manufacturing processes produces solutions that exhibit the highest levels of safety, performance, and reliability,” PetersenDean Roofing & Solar CEO Jim Petersen said.

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FERC ruling a ‘significant step’ towards wholesale market participation for energy storage

A unanimous vote taken by the US regulator FERC (Federal Energy Regulatory Commission) which would allow energy storage and other distributed energy resources to play into wholesale markets has been hailed as a “significant step” forward.

FERC voted 5-0 in Item E-1, a draft ‘Final Rule on Electric Storage Resource Participation in Markets Operated by Regional Transmission Organisations, or RTOs, and Independent System Operators, or ISOs’. The rule sets out frameworks through which electricity storage can participate in various capacity, energy and ancillary services markets operated by RTOs and ISOs – the operators of the US’ transmission and distribution (T&D) networks.

While the commissioners accepted this entrance of energy storage to be a desirable and perhaps inevitable outcome, there is still one further hoop for the rule making to pass through – a technical conference will be convened in April by FERC to gather information on all of the proposed and potential reforms to the way distributed energy resources can be aggregated on electricity networks.

RTOs and ISOs are asked to establish participation models for storage in the wholesale markets of  their service areas, including technical parameters, minimum resource size requirements and eligibility. The drafted Final Rule also “requires that the sale of electric energy from the RTO or ISO market to an electric storage resource that the resource then resells back to those markets must be at the wholesale locational marginal price”.

Trade groups Advanced Energy Economy, Energy Storage Association quick to applaud FERC

Advanced Energy Economy, a trade group formed by private companies looking to modernise and decarbonise their energy supply and generation, and counting the likes of Apple, AES, Microsoft, Schneider Electric, Siemens, Sunpower, NEXTracker, Facebook, E.On and many others among its members, had already applauded the initiative when first put forward in late 2016 and early 2017.

The group once again stepped forward to commend the FERC rulemaking.

“Through today’s order, FERC has taken a significant step toward removing barriers that keep advanced energy technologies from competing in wholesale electricity markets on the basis of their ability to improve the reliability, resilience, and affordability of our energy system. Energy storage can help reduce costs to consumers and ensure that the lights stay on,” Malcom Woolf, AEE senior vice president for policy, said.

“We firmly believe that aggregated DERs deserve the same opportunity to compete on the basis of price and performance, and   look forward to engaging in a formal process to ensure barriers are removed for these critical energy resources as well.”

Meanwhile, the US Energy Storage Association’s CEO, Kelly Speakes-Backman, called FERC’s latest action, “the culmination of a concentrated and holistic review of the framework needed to support participation of vital electric storage technologies in the wholesale markets”.

“Since the rulemaking was initiated in November 2016, the Energy Storage Association – driven by the tireless efforts of its Vice President of Policy, Jason Burwen – has advocated for establishing transparent, standardised RTO and ISO policies regarding the participation and integration of electric storage,” Speakes-Backman said.

“Electric storage technologies already fulfill crucial functions in the bulk power system to provide reliable power and a more resilient grid.  With this morning’s unequivocal action, the FERC signaled both a recognition of the value provided by storage today, and more importantly, a clear vision of the role electric storage can play, given a clear pathway to wholesale market participation.”  

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FPL deploys the US’ first DC-coupled grid-scale battery at Florida solar farm

Utility Florida Power & Light claims that a just-completed battery addition will increase output from a large-scale solar farm in its home state, thought to be the first time a DC-coupled solution has been used at this scale in the US.

Some residential energy storage battery systems available in the States and elsewhere already utilise DC-coupling, but the configuration is new for utility-scale plants. FPL’s newly unveiled solar-plus-storage system will be able to integrate into the network surplus energy that would otherwise be ‘clipped’ from an AC-coupled solution during peak generation periods when the sun beats down the hardest.

As with a few other recent projects co-locating batteries with wind or solar, the overall idea behind the project is to create a clean dispatchable energy resource. Using batteries to increase generation yield and to add predictability to the power plant’s output means it will be easier to co-ordinate with the balancing of other assets on the grid network, FPL said.

FPL, part of the NextEra group of companies, will deploy a 4,000kW / 16,000kWh (4MW / 16MWh) battery storage system at FPL Citrus Solar, a 74.5MW PV plant completed in 2016 and one of three of the same capacity developed in Florida’s DeSoto County by the utility.

FPL said NextEra Energy companies have been researching and testing battery storage tech to assess the potential benefits for “several years”, with around 130MW / 100MWh of battery storage systems under their operation. This included a few pilot projects. Following a rate agreement ruling with the regulator, Florida Public Service Commission, FPL plans to develop 50MW of battery storage in an undetermined timeframe – the utility said in the “next few years” in a release. Parent company NextEra has recently unveiled plans for battery projects in Arizona.

FPL president and CEO Eric Silagy said the firm had “set a standard” for low-cost solar development and was now “looking at the next level” – adding batteries.

“By harnessing more solar energy from the same power plant, this has the potential to further reduce our fossil fuel consumption and save our customers even more money on their electric bills,” Silagy said.

FPL has added 520MW of PV capacity in the past two years and will have completed a further 300MW by the end of February. The utility touted the ability of solar to improve FPL’s carbon emissions profile and keep customer rates low for the long term.

Meanwhile, development of an energy storage market for Florida has lagged behind other leading states in the US, with few project announcements emerging. However, a recently proposed piece of legislation called for the establishment of a pilot programme within Florida’s Department of Agriculture and Consumer Services to investigate and correctly value the use of solar-plus-storage systems in preventing or coming back from energy supply and delivery problems stemming from natural disasters and other causes.

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First Solar partners with Arizona utility for peak dispatch solar-plus-storage project

Vertically-integrated solar energy company First Solar will be involved in the first megawatt-scale battery system announced in Arizona since it was revealed the state could put a 3,000MW energy storage deployment target in place.

US-headquartered First Solar, which makes and deploys thin-film solar PV panels at utility-scale projects, made an investment a while back into grid-scale and commercial system integrator and provider Younicos but had yet to make a move into a project.

A 50MW battery – MWh rating was not revealed – will be charged with the output from a 65MW solar field to deliver energy to customers during peak demand periods in a project being undertaken by First Solar and utility Arizona Public Service (APS).

In other words, the solar-plus-storage system will be configured to dispatch large amounts of energy between 3pm and 8pm each day, delivering “clean power to Arizonans on hot summer days”, First Solar said. During those time periods, solar PV generation is starting to ramp down as energy use rises, for example as domestic customers arrive home from work and start up their household appliances in the early evening.

APS had issued a request for peaking capacity resources, to which First Solar responded and was awarded the contract to build and operate the facility. Going forward, APS has a plan in place to deploy 500MW of energy storage over the coming 15 years.

The project follows closely on the heels of Andy Tobin, a director at Arizona’s regulator, the Corporation Commission, presenting a plan at the end of January to generate 80% of Arizona’s power from renewable sources by 2050, establish a so-called ‘Clean Peak’ standard and instruct utilities to install 3,000MW of energy storage by 2030.

Energy storage deployments are already under way in the state. Another of the main utilities, Tucson Electric Power (TEP), announced a 100MW solar PV array coupled with a 30MW/120MWh energy storage system, which would sell its output to TEP at less than three cents per kilowatt-hour from the combined installation for a 20-year period – a “historically low price”.

Other developments include the announcement that APS will save itself from building miles of expensive transmission and distribution (T&D) infrastructure with the strategic deployment of two 8MWh energy storage systems, which Energy-Storage.News reported in August last year. In a recent technical paper, Alex Eller of Navigant Research discussed the topic of energy storage as an alternative to T&D spending.

Dynamics of rooftop PV versus utility-scale add nuance to discussion

The spread of solar has been a contentious issue in Arizona, with controversies over rooftop solar in particular and accusations that utilities are less than keen to accommodate the technology. However utility solar has not suffered similar difficulties and continues to grow apace.

Lon Huber, vice president and head of consulting at Stratagen Consulting told Energy-Storage.News that: “There have been some issues with rooftop solar and the utilities in the past”.

“APS came to a settlement, TEP’s case is still ongoing, it hasn’t been a smooth relationship necessarily but this plan is pretty co-ordinated and it’s pretty comprehensive so every resource will have its role to play,” Huber said of the 3,000MW target and overall plan put forward by the Corporation Commission.

“The price of [utility-scale] solar in Arizona is at or below wholesale prices. Just think about that – it’s not in 20 years, it’s today, at or below wholesale. When you can get a PPA for 2.5-3 cents per kWh, fixed for more than 20 years, that’s really hard to beat!

“Utility solar has a higher capacity value. And so if somebody says to you, just from a cost-efficiency standpoint, would you like to do 2.5 cents solar with a high capacity value or 10 cent rooftop solar with a lower capacity value, which would you pick?

“The distribution system in Arizona is not like in New York or California, there’s not huge constrained load pockets that you can’t get wires into and so there’s no way a distribution system can make up for a seven cent gap or whatever it is. So I think it’s important to note that Arizona is a different animal in terms of distributed versus utility-scale. We have huge amounts of cheap land and great sun which makes utility-scale prices just unbelievably affordable.

“That’s at the heart of this policy, it recognises that and says, great, now that we have this super-cheap fuel, let’s use it to meet our peak demand, instead of just taking it whenever it produces.”

First Solar CEO Mark Widmar said the company was “excited to partner with APS to demonstrate the capabilities of solar coupled with large-scale battery storage”.

“Together, these technologies highlight the significant role for solar in providing reliable, cost-effective energy.”

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Tesla’s PV installs continue rapid decline to 87MW in Q4 2017

Tesla reported another major decline in its residential solar installations for the fourth quarter of 2017, while a supply shortage for its residential energy storage system ‘Powerwall 2’ has created a customer backlog of solar and storage installs of more than one year. 

Tesla reported fourth quarter 2017 financial results that highlighted the rapid decline in solar installations. The company reported solar system installations totalling 87MW, a 20% decline from the previous quarter, which had seen a decline of 38% from the second quarter of 2017. The overall decline in installations through 2017 was 42%.

Tesla is unlikely to retain its leadership in the US residential market when rivals such as Sunrun report fourth quarter installations. However, major rivals to Tesla have seen installations flat line in 2017. Tesla will remain the leading residential installer for 2017 as installs remained until the fourth quarter much higher than the others (Sunrun, Vivint Solar, SunPower). 

The declines have been self inflicted as the company moved away from commercial and industrial rooftop installations as these were said to have generated the lowest profit margins, while shifting residential rooftop sales to internal car sales showrooms in the US, compared to direct sales when the company was SolarCity. 

The company has recently changed direction and increased direct sales through plans to establish 800 retail locations within Home Depot stores across the US. 

To read the full version of this story, visit PV Tech.

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As hardware production ceases, S&C Electric’s focus is on system integration

A spokesman for S&C Electric has confirmed the company will no longer be producing its power conversion system (PCS) for energy storage systems but will remain in the market as a system integrator.

Following reports at the end of January that the company, founded in Chicago just over 100 years ago, is exiting the manufacturing side of its energy storage business, Energy-Storage.News asked a company spokesman, Spencer Zirkelbach, for clarification.

“Simply put, S&C is still very much involved with the system-level integration of energy storage for microgrids and grid-reliability systems, but S&C will now source the energy storage hardware for those systems rather than manufacture portions of them,” Zirkelbach said.

According to Zirkelbach and the company, the “primary value” for S&C’s energy storage customers has always been in its “integration expertise”, citing the successful deployment of 189MWh of energy storage by the company over the past 10 years in various different markets as proof.

Perhaps more than other players that have spread themselves across several different market segmentations, S&C Electric has focused more on two core opportunities: microgrids, which are its main area of interest; and utility-scale battery solutions used to balance grids in advanced commercial markets such as PJM Interconnection, one of the US’ earliest and most lucrative markets for frequency regulation.

“S&C is continuing to apply our integration expertise to energy storage projects within microgrids for our customers. However, we have chosen to no longer manufacturer our PureWave line of products, which have been used as the power conversion system (PCS) component in energy storage systems.”

The line includes:

  • S&C’s PureWave SMS Storage Management System
  • PureWave SMS-250 Storage Management System
  • PureWave CES Community Energy Storage System
  • PureWave DSTATCOM Distributed Static Compensator
  • PureWave UPS System
  • PureWave UPS XT Systems

In previous projects the PureWave system had been configured to work with different batteries including lithium-ion and NGK’s sodium sulfur grid devices.

The move follows a recent decision by rival system integrator NEC Energy Solutions to sell off its interest in lithium battery cell and electrode manufacturing to focus more on its system integration role. Energy-Storage.News pinpointed S&C Electric, along with NEC ES, as one of 10 standout system integrators in the global energy storage market in a feature article last year, while recent projects the company has executed include New Zealand’s first grid-scale battery system and a successful ‘islanding test’ on a microgrid in Illinois.  

Spencer Zirkelbach of S&C Electric confirmed these areas would remain of primary strategic interest to the company.

“In the energy storage market, S&C will continue to pursue projects that deploy energy storage in support of microgrids and grid-reliability projects,” Zirklebach said.

Read ‘The big future for microgrids’, an in-depth study of S&C Electric’s ‘showcase’ microgrid for Texas utility Oncor, here.

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Younicos repowers another US wind farm’s legacy energy storage system with lithium-ion batteries

Younicos will carry out another project to retrofit lithium-ion batteries in replacement for an existing lead acid battery system at a wind farm, this time in Hawaii.

In December 2017, Energy-Storage.News reported that battery energy storage at the 36MW Notrees wind farm in Texas was successfully upgraded by the German-American system integrator to take out existing lead acid batteries and replace them with lithium. Company spokesman Philip Hiersemenzel said that the operation had been carried out with “minimal downtime” from the system.

Younicos is now following that up with the award of a contract to do the same for Kaheawa, a wind farm built in two phases totalling 51MW generation capacity, on the island of Mau, Hawaii, from developer and asset owner TerraForm Power. The energy storage facility will be of 10MW capacity, expected to have a short duration of storage and will be used to smooth out the variable output of the wind farm. The project is expected to be completed during the second half of this year and will be fitted with Younicos’ proprietary Y.Q. control software.

The lithium-ion retrofit will increase the usable energy capacity potential of the wind farm, increase operational lifetime of the energy storage system and the use of the Y.Q platform will enable the storage facility to run on a fully automated basis, including assessment and monitoring of the life of the battery.

“The combination of wind plus storage adds stability, while also making new revenue streams for renewables possible through services such as peak shifting or arbitrage,” Younicos managing director Jayesh Goyal said.

“It’s a win-win for both TerraForm and the environment.”  

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Arizona’s 3GW energy storage target, ‘Clean Peak plan’ part of a ‘wake up call’ to other states

A 3,000MW energy storage target, proposed in Arizona as part of a grid modernisation policy, recognises the role of the technology in reducing the need for fossil fuels to stabilise the grid, a consultant has said.

Yesterday, Andy Tobin of the state’s regulator, the Corporation Commission, presented a plan that includes a goal to generate 80% of Arizona’s power from renewable sources by 2050, a commitment to review the existing Renewable Energy Standard and Tariff (REST) policy, to use renewables to mitigate peaks establishing a ‘Clean Peak’ standard and to deploy 3,000MW of energy storage to “leverage low priced energy during the day”.

The Commission will vote on the proposal in the next couple of weeks. A final vote is expected which would make the regulatory proposal legally binding, within six months to a year, Lon Huber, vice president and head of consulting at Stratagen Consulting, told Energy-Storage.News.

The 3GW target would be the biggest established to date in the US – the first state to set a target, California, is calling for 1.35GW by 2024 and New York for 1.5GW by 2025. While the timeline for deployment is longer for Arizona than those two previous title-holders, Huber pointed out that relative to the state’s size, the figure pencils out at a far higher capacity deployed per capita than in the others.

Lon Huber said the establishment of the target is closely linked to known plans for development of new gas turbine facilities by Arizona’s major utilities, including Arizona Public Service, which is projecting that it will need 5GW of new gas plants by 2032. Huber said it was likely the 3,000MW figure was arrived at as “a fraction of the new combustion turbines in the IRP (Integrated Resource Plans) of the utilities”.

“I think the assessment of what could be cost-effective storage was probably based on the need for new peakers over the next 15 years, more than anything. I think the innovation here is that, depending on different states and how they do things, you could end up in a situation where you buy a lot of renewables but you still need a large fossil backup fleet.”

While renewables-plus-storage may not be ready to take over the role of large thermal generation plants – and in the case of Arizona, the US’ largest nuclear power plant – in providing baseload energy, Huber said that in the hierarchy of needs, peaker plants which are often only run on a part-time basis to stabilise the grid, come first. In a recent blog for Energy-Storage.News, Marek Kubik at storage system provider and integrator Fluence wrote about an academic study into Ireland’s grid which showed the role batteries could play there in stabilising the grid using far less capacity than thermal generation.

Huber said Tobin and the Corporation Commission appear to have realised that ratepayers should not have to pay for both the renewables deployed and the fossil fuels used to stabilise their variable output onto the grid, with Arizona set to use “renewables to whittle down that fossil backup fleet, so that ratepayers don’t pay twice for resources”.

Essentially, with utility-scale solar prices lower than wholesale in Arizona, at as low as 2.5 to 3 cents per kWh on a 25-year PPA, the state has “super-cheap fuel” which it can now use for meeting peak demand, Huber said.  

The plan

The multi-faceted proposal calls for:

Modernisation of policy framework – including renaming the REST policy the Clean Resource Energy Standard and Tariff (CREST). The Commission said will “allow for the development of broader diversified energy policies relating to clean energy resources, energy storage, and energy efficiency, not just those related to renewable energy”.

80% clean energy goal – the state will generate 80% of its energy from renewable and clean sources by 2050, with an “ultimate 100% goal”, although no timeline has been given for the latter. Utilities will file annual CREST plans with the regulator to demonstrate how they will work towards achieving these goals.

3,000MW energy storage target by 2030 – the Commission aims to enable the state to “leverage” off-peak power generated during the day by solar, as well as adding resilience and stability to the grid network. Again, utilities will file annual CREST implementation plans with the regulator.

Biomass – 60MW target for utilities to procure annually between them. Part of the idea behind this policy is to sustainably source fuel from forests which pose a wildfire risk if their growth is kept unchecked.  

Clean Peak standard – regulated utilities will be required to set a Clean Peak Target, harnessing dipatchable renewable energy. The utilities must incrementally increase their baseline figure of peak energy coming from renewable sources by 1.5% each year, again filing annual CREST implementation plans with the Corporation Commission.

Utility view

Lon Huber said that while there have been well-publicised battles over solar in Arizona, particularly in a pushback against rooftop solar from utilities, utility–scale PV in the state is far cheaper and with a higher capacity value, hence support for utility solar has been strong for some time.

“The distribution system in Arizona is not like in New York or California, there’s not huge constrained load pocket that you can’t get wires into and so there’s no way a distribution system can make up for a seven cent gap or whatever it is. So I think it’s important to note that Arizona is a different animal in terms of distributed versus utility-scale,” Huber said.

The utilities will have to modify their 15-year IRPs to meet the new standards, Huber said and it will be a case of “wait and see” what the likes of TEP, APS and NV Energy – which recently announced a renewables tender that included consideration of energy storage – have to say as major stakeholders in the energy system. The Arizona CREST proposal could be a “wake up call” for other states, according to Lon Huber.

“We’ll see how other states react to it. It’s anyone’s guess but I think it should send a little bit of a wake-up call to certain states that maybe haven’t thought about modernising their renewable energy policy…That’s sort of like the key thing. Other states should take note – technology is improving, why don’t you update your policies to take that into account?”

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California regulators at ‘essential starting point’ to enable revenue stacking

Steps taken in California to enable energy storage systems to provide multiple services and to ‘stack revenues’ are “an essential starting point” for the industry, the head of California’s Energy Storage Alliance (CESA) has said.

In mid-January, California’s Public Utilities’ Commission (CPUC), the state regulator, issued a Proposed Decision on “Multiple use application issues” affecting energy storage systems connected to the grid. For some time, the energy storage industry, particularly among those working with versatile advanced lithium-ion batteries, has advocated that the ability of storage to provide more than one service – sometimes simultaneously – should be better recognised.

This would be of economic benefit to the system owners or operators, who could net several revenue streams that could be built into a ‘revenue stack’, while obviating the need to deploy several energy storage systems or other energy infrastructure that can carry out the same functions, at various locations, which would benefit ratepayers and the overall network. A report by the Brattle Group published in September last year, commissioned by battery and system maker Eos Energy Storage and funded in part by the California Energy Commission (CEC) found that the value of a front-of-meter battery energy storage system in California could double or even treble by adding more than one revenue stream to a project.

To read the full version of this story visit Energy-Storage.News.

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