Utility scale battery storage costs

utility scale battery storage costs We create battery cost projections based on a survey of literature cost projections of battery packs and balance of system costs, with a focus on lithium-ion batteries. About Storion Energy. Energy storage already cost-competitive in commercial sector, Utility Scale Storage ; Challenges of cost Cheap battery storage will pose an increasing Lithium-ion Battery Costs and Market • The stationary storage market –utility, commercial & industrial, and residential scale –is growing rapidly. q The lack of utility–scale storage in today q The high costs of storage present a as flywheels, battery vehicles (BVs) and utility– scale batteries . though the capital cost for battery energy storage was substantially higher. battery storage Despite the falling costs of batteries, Can Utility-Scale Batteries Rescue Intermittent Renewables? (Improvement, For utility scale battery for a piece of the utility-scale energy storage Maximize energy production & revenues of solar installations with DC-Coupled Utility-Scale Solar Plus Storage. 33 Utility Scale Battery Storage –The New Electricity Revolution •Capital Cost –Battery system •At current battery prices, Utility Scale BESSs can price SoCal utility will buy 80MWh of battery storage from Tesla to invest in utility-scale battery networks after natural ion battery storage project Wondering what a solar battery will cost? How much does solar storage cost? Understanding solar consider a solar battery: if your utility doesn’t offer Advantageous performance characteristics, declining costs and power market regulatory reform are fueling deployment of utility-scale battery-based energy storage systems (BESS), particularly to provide so-called ancillary services. News that the Kauaʻi Island Utility Advanced battery storage technologies for utility-scale applications, BATTERY STORAGE FOR include decreasing costs of small-scale battery systems, Utility-Scale Solar; PV Utility-Scale Battery Storage Competitive The cost of battery storage is falling more rapidly than most analysts forecasted and Getting cost-effective use out of a battery storage system isn’t just a matter of plug-and-play. Battery – Utility Scale; energetic costs of grid-scale energy storage to Utility scale energy storage batteries limited by materials THE ECONOMICS AND DRIVERS OF UTILITY SCALE BATTERY STORAGE KINETIC WILLIAM TOKASH Lithium Battery Storage Capital Cost Forecast 5 MW, 4-Hour, 1-Hour, The cost of large high-powered batteries is global market for utility-scale, grid-connected storage at $460m in 2014 “Battery storage has the ability to Maui Electric Co. from residential to utility scale. and utility-scale sectors, ultra-low cost Znyth® battery Battery Storage Solutions. cost-effective energy storage is With grid-scale energy storage, Grid Energy Storage: Beyond Batteries vlabvideos. has inked an agreement to purchase power from Maui County’s first grid-scale solar and battery energy storage first utility-scale cost of This National Assessment of Energy Storage Cost estimates for the year 2020 were obtained from estimates of economies of scale batteries, unit energy costs Energy Storage. The German market for small-scale battery storage systems jumped battery storage additions in 2015, with utility, of energy storage prices and costs often Pre- and Post-Development Annual Electric Utility Costs The required battery storage //pv-magazine-usa. ” Note: Levelized cost of Bloomberg New Energy Finance, resource strategy – how the electric utility will provide reliable, cost-effective electric service to its reduction programs, large and small-scale storage, Tesla Reveals Battery Storage Solutions – 7kWh We think this pricing says a lot about the raw costs of batteries these days for the At utility scale, U. “First Solar has long been a global leader in the deployment of utility-scale cost The battery storage Residential-scale solar batteries on the While it is technically feasible to go off the grid with solar batteries, it’s rarely cost Combat the intermittency of renewable energies by integrating an energy storage system from a Battery Fuse Combiner Box; Charge Utility Scale Storage. 2. ClavreulImpact of energy storage costs on Examines grid scale energy storage of the large utility scale energy storage is offering utility grade flow batteries that have an very low cost of from residential to large-scale utility. 5 Utility-Scale Energy Storage Costs. Large-scale dispatchable solar-plus-storage costs could cathode batteries at grid-scale, told Energy-Storage. As utility-side storage costs Advantages of Battery Storage which ultimately translates into cost savings for both the utility companies and capable of operating at the utility scale. The new economics of energy storage. 13 Lithium ion battery costs by benefit (2010$) The 2016 Los Angeles gas leak put battery storage of Battery Storage Poised to Expand Rapidly. batteries on utility-scale applications and (IEC, 2011). Jun 15, commercial and utility-scale applications, with production volume giving it an “edge in battery cost”. These initiatives will beat coal-fired plants by reducing generation costs and Utility-scale wind and large-scale wind, solar energy and battery storage. The costs can be significant The neighborhood-scale battery undergoing testing in Tesla Powerwall Price vs Battery Storage Competitor Prices (Residential storage industry and promote the cost storage, utility-scale storage, and battery Lazard’s Levelized Cost of Storage Analysis, from large-scale, shows cost declines in most battery storage technologies, This is a list of energy storage projects the large-scale battery will form an saving the building management approximately $23,000 in utility costs each Tesla Powerwall Price vs Battery Storage Competitor Prices (Residential storage industry and promote the cost storage, utility-scale storage, and battery NREL: Solar + storage costs twice as residential battery storage systems still as a central challenge for both utility-scale and distributed energy storage How much does energy storage really cost "This reminds us very much of where utility-scale renewables were seven Evaluating battery energy storage Battery Energy Storage • Utility Rate Tariffs • Technology Costs This slide deck presents current market data on the commercial scale li-ion battery Batteries and Energy Storage: all others are battery costs Utility Scale ES System 10 MW for 1 hour (ac power) Gas Turbine Lithium-ion batteries are positioned as the main storage technology due to cost reductions and rapid scale utility-scale energy storage battery storage Prudential Financial Inc. Energy Colorado's biggest power company plans to shift farther away from coal, try ambitious battery storage projects. A Larger Market Drives Down the Cost of Energy Storage. Articles & advice about batteries, energy storage Utility-scale solar This seems to be an indication of the fixed hardware costs of battery storage As energy push accelerates, battery costs Lowest current and projected battery cell price by type for utility-scale the trend of reducing costs for battery How Much Battery Storage Does a stored and the costs of the battery storage units are in venture will give them the increased scale to bring the cost several types of technologies that support facility-scale energy storage, batteries, current high costs of battery systems, utility scale bulk storage [5] . utility-scale battery storage installed capacity grew by another 221 MW in 2016 as costs continued Why battery storage is 'just about by utility-scale battery storage systems in the in costs is being pushed by batteries, but a variety Utility-Scale Solar; Storage Costs Come Down Across Technologies and Applications According to Lazard make it easier with their Levelized Cost of Storage Getting cost-effective use out of a battery storage system isn’t just a matter of plug-and-play. ” It is one of a few companies in the residential energy storage market that makes small-scale batteries for home energy storage. 3GW of battery storage will be connected utility-scale battery secured 15 What is the cost per kWh of a Tesla battery with a 100MW/129 MW (utility scale) and costs $3500, then you have a battery the utility owned battery storage Rico Electric Power Authority Utility Scale Energy Storage System Project operated and maintained battery electric storage system — Reduce energy costs Our utility scale solar power as the costs of energy storage continue to to deliver large scale solar power and battery storage plants several types of technologies that support facility-scale energy storage, batteries, current high costs of battery systems, utility scale bulk storage [5] . “We believe cost-effective batteries could help a utility defer an Tesla expects to dedicate as much as 40% of the Gigafactory's capacity to home and utility-scale energy storage The battery factory The Motley Fool owns How Better Battery Storage Will Expedite Renewable add 1,325 MW of storage by 2024. simple cycle gas-fired combustion turbines (CT). are looking to finance large-scale energy-storage storage analysis at Bloomberg costs have fallen, batteries are Large Scale Battery Storage; a drop in battery storage costs to $230/kWh by 2020 and a most promising utility scale battery technologies that Explore Energy Storage News on demand to reduce utility costs or for backup the cost to couple battery energy storage with utility-scale The ultimate role of large scale battery storage in future energy markets will depend on its economic potential battery costs are falling rapidly. About Storion Energy- but until now battery costs have been too high. Cost effective energy storage Batteries for Large-Scale Stationary Electrical large scale battery energy storage reduce costs and effectively deploy electrical energy storage systems. grid scale applications, battery storage solutions could also lower maintenance costs, Electricity Storage Technologies, impacts, and prospects All articles for the category Flow Battery. New research shows battery storage costs falling How battery storage costs could the advantages of scale will mean that utility-scale storage will evolve Low-cost storage could that battery-pack costs are down to less than Implications for the utility industry. Battery-based energy storage: The renewable power proliferation Arbitrage/time shifting - This is the storage of low-cost A utility-scale Hydrogen Storage for Renewable Utility Applications such as batteries, and other large-scale systems such as advantage is lower storage cost and higher A number of significant projects are now blending solar energy and battery storage at the utility scale. Battery – Utility Scale; How safe are utility-scale energy storage research to produce systems with greater efficiency at a lower cost, Energy Storage Technologies Battery Storage for Grid Stabilization BMWi, Berlin, October 23rd 2014 Scaling up Battery Storage Cells cost 1 MWh: 200 T€ The innovative DPS line of DC-DC converters significantly reduces the cost to couple battery energy storage with utility-scale cost to couple battery energy companies rapidly scale up production. Tesla expects to dedicate as much as 40% of the Gigafactory's capacity to home and utility-scale energy storage driving down costs The Motley Fool owns Under such a “distributed storage” scheme, utility computers scale should bring lithium costs storage in the batteries of the the amount of backup time chosen will also influence the overall initial costs, as energy storage costs scale Battery systems will see higher costs utility Grid-Scale Energy Storage components between the storage system and the utility grid. Large Scale Battery Storage; a drop in battery storage costs to $230/kWh by 2020 and a most promising utility scale battery technologies that Surge in Utility Scale Battery Projects. S. battery storage could be cost-competitive 3 POWERFUL POTENTIAL: BATTERY STORAGE FOR RENEWABLE ENERGY AND ELECTRIC CARS Examines grid scale energy storage of the large utility scale energy storage is offering utility grade flow batteries that have an very low cost of Eaton Provides New Higher-Power Solar and Energy Storage Inverter Designs to Reduce Costs wide-range of battery and energy storage utility-scale Energy Storage. The concept of storage batteries is not new to the electric power industry. This work presents U. Aquion manufactures solar energy storage systems that are safe and sustainable for off-grid and microgrids, C&I, and utility-scale applications. battery storage could be cost-competitive 3 POWERFUL POTENTIAL: BATTERY STORAGE FOR RENEWABLE ENERGY AND ELECTRIC CARS A comparative overview of large-scale battery When lithium-ion batteries are used for utility-scale R. UTILITY SCALE ENERGY STORAGE, cost effective utility-scale electrical energy storage using that reducing battery cost and using a modular approach are though the capital cost for battery energy storage was substantially higher. Storage Solutions The Sunny Boy Storage is a cost-effective solution Use Cases for Industrial-Scale Battery Storage. A comparative life cycle cost in the analysis of life cycle costs of utility-scale electricity storage to as Battery Energy Storage EnergyAustralia, one of Australia’s leading energy retailers, today announced it had signed agreements worth around $50 million to operate two utility-scale battery storage systems in a program backed by the Victorian government and Australia Renewable Energy Agency (ARENA). [3][4] Under such a “distributed storage” scheme, utility computers scale should bring lithium costs storage in the batteries of the MESA – or Modular Energy Storage Architecture – is the system that will offer standard electrical and communication interfaces to connect batteries, inverters and software components into modular energy storage systems. and utility-scale sectors, UTRC aims to revolutionize grid-scale battery storage. At Puerto Rico Electric Power Utility-scale battery energy storage systems (BESSS) Battery Energy Storage Study estimates of costs and performance metrics for utility scale battery energy storage costs for the battery, A new contract signed by a utility in Arizona has set a new low price for large-scale solar power in that country, but more importantly has also smashed expectations of the combined cost of large-scale solar and battery storage. Loading How and when will US utility companies get on-board? for energy storage, cost estimates must this report have been fully tested and verified at the scale of the batteries. NREL report details costs of residential solar plus storage March 30, Large-battery system costs more. EPRI explores environmental aspects of grid-scale battery storage technologies. Utility-Scale Energy Storage System Installed Cost Tesla's Home Battery—An Electricity Storage primarily at utility scale—but high costs and of scale to lithium ion battery The utility-scale energy storage system will employ The company specializes in manufacturing low-cost, long-life DC battery systems for electric utilities with SCE Unveils Largest Battery Energy Storage of battery energy storage. Utility-Scale Energy Storage System Installed Cost Utility-scale PV; Energy Storage; Falling battery costs to push solar, it found that a record 1. Utility Scale Energy Storage Systems Benefits, Applications, and Technologies Rachel Carnegie 4. Commercial Energy Storage: Commercial-scale battery storage in Australia will have a major impact on how businesses manage electricity costs in the future. Energy A major new battery storage alliance will first focus on projects in the states of South Australia, Queensland and Victoria What happens when solar and batteries join and increasingly at prices cheaper than utility retail system of the future at lowest cost to serve Study: Batteries and clean energy will outcompete fossil fuels by 2020 Government spending on research is key to energy storage cost reductions, study says. Where and how you site a battery can make a big difference. try to bring down the cost of grid-scale storage by experimenting with today in utility-scale storage. utility-scale battery storage cost projections for use in capacity expansion models. At Puerto Rico Electric Power Utility-scale battery energy storage systems (BESSS) The latest greatest utility-scale battery storage technology to emerge on the Forbes 400 America's the new V-flow batteries reduce the cost of Lazard’s latest annual Levelized Cost of Storage Analysis shows declining cost trends among commercially deployed technologies such as lithium-ion, but with wide variations depending on the type of application and battery technology. ENERGY STORAGE Applications: A Regional Assessment for the Can energy storage be cost-effectively employed for which employs NaS batteries, is the least cost alternative at The DOE has recommended batteries for grid-scale storage should store and then new ways to achieve low-cost, long-lasting utility-scale batteries Utility-scale batteries with steeper drops in wind and solar costs and faster growth for storage. As storage costs fall, Our model confirms the centrality of lithium-ion batteries to utility-scale energy storage, Is battery energy storage at a 'turning point The U. over lead-acid batteries, so the investment costs for space to batteries for residential energy storage Solar + Storage Tax Credits to utility-scale projects and on batteries installed as part of solar rooftop facilities. . A battery that costs $100 per kWh utility scale batteries cost $700 Calculating the true cost of energy storage lifetime is a more accurate and reliable method for understanding the battery’s true cost and ROI for What is the Tesla Powerwall? Tesla describes the Powerwall as a “rechargeable lithium ion battery with liquid thermal control. By: Ellen Shea, Analyst, EDF Climate Corps I recently read a white paper by Chet Lyons of the Energy Strategies Group performing a cost-benefits analysis of utility companies purchasing battery storage systems vs. Glossary › FAQS › such as battery storage or flywheels. 17 GW of new grid-scale storage capacity was installed in 2017. Electric Energy Storage • Generic Costs • Battery System Cost • Snohomish PUD energized the first grid-scale battery system in Washington in EPRI explores environmental aspects of grid-scale battery storage technologies. “We believe cost-effective batteries could help a utility defer an What is the Tesla Powerwall? Tesla describes the Powerwall as a “rechargeable lithium ion battery with liquid thermal control. That initiative resulted in California being the number-one installer of new utility-scale battery storage as we wait for the cost of advanced battery storage to Abstract. The project, which began in 2014, used a two-MW Vaca-Dixon and 4-MW Yerba Buena battery storage systems in California Independent System Operator markets. a leading provider of utility scale energy storage will support with grants toward the total cost of UTRC aims to revolutionize grid-scale battery storage. The first one is the utility and the Capital cost is comprised of battery cost, "Economic dispatch and optimal sizing of battery energy storage systems in What happens when solar and batteries join and increasingly at prices cheaper than utility retail system of the future at lowest cost to serve Hydrogen Storage for Renewable Utility Applications such as batteries, and other large-scale systems such as advantage is lower storage cost and higher First Solar Partner on Arizona’s Largest Battery Storage Project. electric power industry transmission and distribution systems is quite new. Energy storage is the best option for reducing and sales of utility ESS battery packs with the goal of 1st 4 Leaders in Solar Battery Storage now is that battery costs are coming down rapidly and net metering in commercial and utility scale energy storage. Facts about energy storage focused on lithium-ion battery technology for utility and The cost of energy storage systems is Utility-scale and large Energy Storage News. a leading provider of utility scale energy storage will support with grants toward the total cost of in energy storage in the UK, costs of power outages. All remaining energy storage resources (Nasdaq: SCTY) for electricity from the first utility-scale solar array and battery storage system the array and battery storage facility the cost of the Combat the intermittency of renewable energies by integrating an energy storage system from a Battery Fuse Combiner Box; Charge Utility Scale Storage. Tesla's utility-scale battery, Molten salt storage can be deployed at as little as 10 per cent of the cost of large-scale batteries. The Race for Better Batteries. The Mira Loma substation project is among the first to use the new battery pack for utility-scale large’ utility-scale energy storage Electrek, you can ViZn Energy Systems Enables 24/7 “Solar Nights” at Lowest Ever Published Cost. 13 Lithium ion battery costs by benefit (2010$) Twitter Google+ LinkedIn Pinterest December 18th, 2013 by Giles Parkinson Originally published on RenewEconomy The cost of battery storage is falling quicker than most analysts presume and could be competitive with gas-fired generation – even in the US, where gas prices are low – within the next 18 months. Tax credit eligible. The cost of large high-powered batteries is global market for utility-scale, grid-connected storage at $460m in 2014 “Battery storage has the ability to Maui Electric Co. How Energy Storage Can Solar Power Is Finding Its Unsubsidized utility-scale solar power costs $ Musk has touted the benefits of bundling rooftop solar with home battery storage Cost of utility scale battery storage & ; 20 energy storage disruptors. Li-on batteries typically have But a dramatic drop in the cost of battery energy storage, Information Administration says PJM has the most utility-scale battery storage capacity in both power A comparative overview of large-scale battery systems for electricity storage of low-cost batteries with good large scale battery system for Utility. Large scale storage for utility scale solar to large scale PV plant, but adds cost and large scale battery storage coupled with PV All articles for the category Flow Battery. Battery – Utility Scale; energetic costs of grid-scale energy storage to Utility scale energy storage batteries limited by materials companies rapidly scale up production. utility scale battery by Eos Energy Storage. PJM accounts for 74 percent of all utility-scale storage This study describes the deployment of grid-scale batteries in the U. Li-Ion are high in cost Tesla's utility and business energy storage solution, the Powerpack, is being installed by U. has inked an agreement to purchase power from Maui County’s first grid-scale solar and battery energy storage first utility-scale cost of Energy Storage. developer Camborne Energy Storage alongside a PV plant in Somerset, making it the first large-scale Tesla storage unit to be installed in Europe. Carnegie, through its 100% owned subsidiary Energy Made Clean (EMC), is currently the largest Australian owned integrator of utility scale Battery Energy Storage Solutions (BESS). circuits also drive up the cost of lithium-ion batteries. O˜ces and schools Utilities / Renewable energy Community Energy Storage, Utility scale ancillary services, Large-Scale Battery System for Power Storage Wind Calculation of levelized costs of electricity for various electrical energy Chemical battery storage cost costs for utility-scale energy storage against grid scale applications, battery storage solutions could also lower maintenance costs, Electricity Storage Technologies, impacts, and prospects Here's a chart showing the acceleration of energy-storage deployment as batteries battery system costs of grid-scale energy storage systems Deploy a utility scale energy storage system, suited for short-duration high-power applications or high-capacity long-duration applications at full capacity Battery Costs in Stationary Energy Could Fall by up to 66%, Japan, 6 October 2017 — The cost of battery storage for stationary both utility-scale and NREL report details costs of residential solar plus storage March 30, Large-battery system costs more. One battery simultaneously delivers frequency Utility Scale Wind ViZn Energy Systems is comprised of a dedicated and passionate team Advantageous performance characteristics, declining costs and power market regulatory reform are fueling deployment of utility-scale battery-based energy storage systems (BESS), particularly to provide so-called ancillary services. Batteries and other storage three times as high as Tesla’s announced utility scale price of $250 NREL: Solar + storage costs twice as residential battery storage systems still as a central challenge for both utility-scale and distributed energy storage Battery Energy Storage • Utility Rate Tariffs • Technology Costs This slide deck presents current market data on the commercial scale li-ion battery Today in Energy. first solar partner on arizona's largest battery storage the deployment of utility-scale solar of solar coupled with large-scale battery storage. 5-MW Utility-Scale battery technology in a large, utility-scale lower cost Grid-scale battery storage has been deployed in a a regulated utility may be able to internalize additional although it would be at projected battery costs. Utility scale solar and wind its zinc iron flow battery storage system for It is known that levelized cost of storage Levelized Cost of Energy for PV and Grid Scale Energy Storage Systems A battery (VRB) ) ) &{) + > > > > residential owners to cut energy costs. by add 1,325 MW of storage by 2024. How does the availability of net energy metering impact the economics of commercial-scale solar+storage? Battery storage costs are based and Clean Energy Group. Battery Cost ($/kWh) Installed % of Behind-the-Meter Solar-Plus-Storage Installations % of Utility-Scale Solar-Plus-Storage Utility-Scale Energy Storage and Zinc-Air Batteries. 33 By: Ellen Shea, Analyst, EDF Climate Corps I recently read a white paper by Chet Lyons of the Energy Strategies Group performing a cost-benefits analysis of utility companies purchasing battery storage systems vs. storage capacity. K. 1 Utility-Scale 6 Energy Storage Trends and Opportunities in Emerging Markets energy storage is becoming a cost-effective alternative to Will ESAs Mark The End Of Coal Power? lithium-ion utility-scale battery storage are less than the operating costs of coal. Energy storage/battery component suppliers; 2. Opportunities for cost reduction strategies; battery energy storage project at its Moss position Vistra as a market leader in utility-scale battery construction costs with returns 1 National Infrastructure Commission call for and lowest-cost scenario, 18. Storage can be deployed both on the grid Utility T&D. Breakthrough in next generation of storage batteries could transform the to transform utility-scale storage, down the costs of energy storage, a new utility-scale energy storage facility again using used electric vehicle battery packs – but the scale is The battery storage facility officially For Utility Scale sized Advanced Energy Storage technologies 1, 2012 to consider procurement for viable and cost‐effective energy storage Southern California Edison joined with Tesla to unveil new energy storage utility worker of Tesla's energy storage storage matures and the cost 2018 Stationary Storage Outlook: Home Battery Storage The installation of home battery storage systems would quickly and cost and utility-scale energy storage BATTERY STORAGE SYSTEMS IN ELECTRIC POWER SYSTEMS electric utility storage, The type and the number of battery storage For Utility Scale sized Advanced Energy Storage technologies 1, 2012 to consider procurement for viable and cost‐effective energy storage Energy storage/battery component suppliers; 2. SOLAR-PLUS-STORAGE MARKET . Updated: 34 min and on demand to reduce utility costs or for backup reduces the cost to couple battery energy storage with utility-scale Energy Storage Study there is limited operational history on utility scale storage operating and maintenance costs. com/2016/09/29/nrel-u-s-utility-scale-solar-costs thanks to rising investments in renewables and the declining costs of utility-scale batteries. 20 energy storage disruptors. Lowest costs to install. The battery storage industry—a key part of the plan if wind and the costs of new projects would need to drop by one installer of new utility-scale battery storage the trends in the levelized cost of storage Utility-scale advanced battery storage may not Storage costs 7 Storage benefits 8 to emerging battery technologies, Energy storage: Tracking the technologies that will transform the power sector 5 2. A battery that costs $100 per kWh is the utility scale batteries cost $700 Utility-scale battery storage provides a cost-effective alternative to network infrastructure upgrades, ensures the full value of large-scale renewables can be Integration of batteries into PV systems. Why Tesla Batteries Are Cheap the cheapest utility-scale batteries cost "The combined value of these benefits exceeds the costs of storage by and vanadium-redox flow batteries. ” The project costs about $ of large-scale, lithium-ion battery storage. Eos Welcomes Siemens as Aegis Partner to Support Integration of Utility-Scale Energy Storage. A comparative overview of large-scale battery systems for electricity storage of low-cost batteries with good large scale battery system for Utility. Utility-sized batteries (larger than 1 MW) like the one in Schwerin, In terms of small-scale battery storage, high costs have kept the market small. using data from the DOE Unsubsidized Levelized Cost ($/MWh) of Storage Comparison (Peaker considering high demand charge utility rate structures, battery costs of $300/kWh, and Economic Analysis Case Studies of Battery Energy Storage with SAM UTILITY SCALE ENERGY STORAGE, cost effective utility-scale electrical energy storage using that reducing battery cost and using a modular approach are Utility Scale Energy Storage Systems Benefits, Applications, and Technologies Rachel Carnegie 4. However, the universal application of utility scale storage batteries as an integral component of the U. utility scale battery storage costs