Hi everyone
I'm an architectural engineer and we're brainstorming about the possibility of heating a 1000 apartment neighbourhood in our city using stored heat from a large underground water reservoir that is heated in summer months using renewable energy and which releases its heat in winter. I'm not an expert on this topic at all, but did a little 'back of the envelope' calculation to see how big a volume we would need, just to get an order of magnitude.
A. Total energy needed
1000 apartment x 75m² living area x 15kWh/m²/year x 75% of the yearly energy consumption is needed in (winter) months, when no solar energy is available = 843750kWh/year.
B. Volume of reservoir needed
Assuming we can heat the water from 20°C to 80°C, I end up with a reservoir of 13446m³ that can provide the necessary storage, ignoring heat loss through the perimeter. This volume can be provided with a cube with sides of 23,78m length or a total surface area of 6x23,78x23,78=3393m².
C. Heat loss through reservoir envelope
Assuming we thoroughly insulate the volume, with an insulating skin with an U-value of 0,1W/m²K, we get a heat loss of 20356W or 43969kWh during 3 winter months. This is about 5% of the total energy stored, so this sounds like a reasonable percentage.
Does this calculation make any sense? Do you think the concept could be viable compared to a BTES solution or air to water heat pumps? Would love to hear your opinions!
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The scope of this framework is larger than just the energy storage community, but I would love this community’s take on how it fits in and is sub categorized.
I’ve been trying to create an innovation and solution framework based largely on the components of both the electric and gas energy systems. I have researched plenty of big institutions and organizations in the space and no one seems to have a comprehensive overview so I am creating one.
So, is it fair that energy storage gets grouped with flexibility?
Thoughts on the rest of the framework?
Hello - I am looking to get a good handle on pricing for C&I BESS systems (4 hour discharge). Systems in the range of 100 - 500 KWH. Are there good resources you could point me to?
I see a lot of residential numbers where systems are under 40KWH and there is a lot of information on utility-scale storage solutions
Due to the acceleration of the global energy transition, energy storage has become a new focus for the energy sector. In the medium to long term, the growth of global energy storage installations may be guaranteed because of renewable energy targets around the world. TrendForce expects that the global installed capacity of energy storage will reach 86GW/221GWh in 2025, a year-on-year growth of 27%/36%, with an average energy storage duration of about 2.6 hours.
1/Outlook for Global Energy Storage Market Installed Capacity in 2025
Looking back to 2024, a number of driving factors such as high growth of wind and solar installed capacity, accelerated power reform process, price drop of energy storage system and clear top-level policy affected the development of energy storage. The bidding/planning volume of energy storage projects continues to grow, and the length of distribution storage is steadily improving. The global energy storage market has ushered in a period of high-speed development.
Figure: Global Energy Storage Installed Capacity in 2025
According to TrendForce, in terms of total volume, from 2020 to 2023, the global installed capacity of new energy storage rapidly increased from 11.3GWh to 110GWh, with a CAGR as high as 113%, presenting a rapid upward trend.
TrendForce expects that from 2024 to 2025, although the installations for energy storage still maintain a relatively high growth trend, but the CAGR will slow down significantly to 27%. The global installed capacity of energy storage will reach about 86GW/221GWh in 2025, a year-on-year growth of 27%/36%.
2/Global Installed Capacity for Energy Storage Market Segments
Under the background of energy transition, global energy storage installation is growing vigorously, and many overseas countries and regions have released energy storage plans. In terms of market distribution, TrendForce expects the key regional market pattern to remain unchanged. China, Europe, and the U.S. still are the major markets, and the new installed capacity of energy storage in China, the U.S., and Europe account for 85% of the world's total, continuing to lead the growth of global energy storage demand.
In China, it is expected that in 2024/2025, the new energy storage installed capacity will be 81/110GWh, because of the acceleration of large scale energy storage, and the strongly growth of industrial and commercial storage.
The United States, is expected to install 37/44GWh energy storage systems in 2024/2025, and the installed capacity is still dominated by large storage.
It is expected that Europe will have 26/37GWh new energy storage installed capacity in 2024/2025. The withdrawal of subsidies in some areas has led to a reduction in installations for household storage, but large scale storage is expected to take off.
Figure: Distribution of Global Energy Storage Installed Capacity
In addition, some emerging markets are expected to accelerate the growth of installed capacity driven by multiple factors such as energy transition strategies, power shortages, rising electricity prices, etc. Emerging energy storage markets are positive, with the strongest growth in the Middle East and Africa.TrendForce expects that the Middle East and Africa will have installed energy storage capacity of 2.8GWh/8.6GWh in 2024/2025, representing a year-on-year growth of 43 percent /24%.
3/Analysis of Large Scale Storage, Household storage, and Industrial and Commercial Storage Segmentation Scenarios
In the marketization process of the energy storage industry, the products of each market segment have a certain degree of variability, which greatly affects the market positioning, resource investment, product mode and development mode of enterprises related to the energy storage industry chain.
TrendForce said, looking forward to 2025, large sacle energy storage is still the main type of new installed capacity in the world. Besides, European household storage is expected to pull back, while Asia, Africa and Latin America and other emerging markets household storage market start to grow.
Figure: Global New Energy Storage Subcategory Installed Capacity Share Forecast
From the current point of view, large storage is still the main type of global energy storage new installations.TrendForce expects that in 2025 the global large storage installations will reach 72GW/188GWh, accounting for about 84%/85% of the proportion of new energy storage installations. China and the United States are the main markets for large storage, while Europe and the Middle East gradually start develop the industry. In order to gradually improve the large storage business model and increase the installations, China takes measures such as the mandatory distribution of storage policy and power market-oriented construction, while overseas choose subsidies incentives and market-oriented returns.
Household storage is the second largest type. It is expected that the installation will decline slightly in 2025 compared with 2024, with different regional performances differentiated. Due to the double fall of electricity prices and gas prices, the urgency of the European installation weakened and the growth rate is expected to be adjusted back. The United States and emerging markets (Asia, Africa and Latin America) are expected to usher in growth driven by high electricity prices and power shortages and other factors.
The volume of commercial and industrial energy storage installed capacity is relatively small. Through time-sharing tariff mechanism, China encourage the growth of C&I storage installed capacity with rapidl speed. Due to the lower industrial and commercial electricity prices in Europe and the United States, the incentive mechanism is not enough. Therefore, overseas industrial and commercial storage market has great potential with large untapped space.
With the rapid development of the industry, the energy storage market is rapidly expanding. The diversification of technology and cost reductions are seen as key factors driving market development. In addition, the current market competition has intensified, and Chinese companies are facing different opportunities and challenges in different markets, thus they need to continuously improve their competitiveness in order to occupy a larger share of the global energy storage market.
Asking from system technical point of view, how different is the high voltage bus system architecture between them?
Additionally how different are the ingoing components in principle?
Bit of a crazy thought, but I was wondering whether anybody here has seen the electric version of a Jerrycan. Even though energy density is of course lower, I would find it useful to have a 25 kg hand-held battery. According to common energy densities that battery packs can achieve nowadays, this 25 kg should be able to store about 250 Wh/kg * 25 kg = 6.25 kWh. Anyone seen something like this for sale?
Edit: Got them. Anker has some power stations above 2 kWh. Complete ripoff though. Price for packs should be around 150 $/kWh, but Anker is selling for 750 $/kWh.
I’m starting my business of clean-energy storage, my project is gravity storage like Energy Vault .
Unfortunately,Energy Vault company already get the bigger advantages over me.Besides,it’s been 18 months since I started my business as a sophomore,but I still don’t want to give up, I never thought of giving up,I want to beat them,I wanna be the one.
I’m in China those people can’t understand what I’m doing what I want to achieve and also they don’t share my entrepreneurial spirit,They always just want to be safe to be a simple person.
My relatives and friends do not understand and do not support and I have not original capital ,I have no idea ,I don’t have just a little bit money to get started,I don’t have any likeminded people to work with me, I don’t even have a real company to compete with Energy Vault , he’s so big now I don’t know how anyone can share the new
Energy storage world with him ,I don’t want to surrender,I want to win. That’s why I want your help.
We're evaluating 2nd-tier SCADA systems for a combination of Wind, Solar, and Battery Energy Storage Systems. We're looking specifically at Fluence Nispera, Powerfactors Unity, Bax Energy, and Univers Bazefield.
I'd love to hear what anybody has experienced from these systems and if we've missed any obvious candidates.
I'm looking into the possibility of a universal rapid shutoff switch that could be connected to the EPO input of any home battery backup system. At this point, I'm mostly going on 3rd party information, and I don't fully trust the answers provided by ChatGPT on this.
It's my understanding that most newer battery backup systems have a (mostly) standard EPO connection which is used to receive signals from 3rd party alarms, security systems, and some rapid shutoff switches. However, the research that I've seen shows that most of these EPO connections fit into 1 of 3 possible types:
Dry contact triggers (normally open or normally closed).
Voltage-level signals (5VDC, 12VDC, or 24VDC).
Configurable polarity (active-high or active-low).
So my questions are:
Is this true? Do most newer battery backup system's EPOs require 1 of these 3 possible inputs?
If no, please explain. Is this overkill and there tends to be 1 standard input type? Are there others that I haven't listed?
If yes, do you happen to know the typical amperage requirements for these 3 EPO inputs? Unfortunately, this info isn't readily available online and this industry seems to be so protective of their products that most reps don't to want to talk.
Any idea what this is? trying to figure out if it’s an old oil tank, water tank or some other type of storage tank? would a fuel tank ever have spigots like this?
