How are energy storages used in energy systems and why do they determine the way the systems will develop in the future?
1. Development of RES

In developed countries, renewable energy sources (RES) are being actively deployed. However, weather conditions rarely meet the countries' energy demands, so an energy storage can accumulate electric energy when it is not in demand, and produce it when it is needed.

2. Bringing HPPs to a new level of effectiveness

The old equipment of heat power plants (HPP) will be replaced not with new units, but with energy storages. The remaining equipment will work in the constant power mode that minimizes the wear and tear and maximizes the efficiency. Not only will this strategy reduce the maintenance and repair costs, but it will also increase the capital productivity and decrease the polluting emissions.

3. Building of new NPPs

Nuclear power plants (NPP) work in constant power mode and for that reason building of new NPPs will require transregional interchange to be significantly increased. Energy storages will accumulate the energy produced by NPPs and deliver it to the grid when necessary reducing the interchange.

4. Energy system reliability guaranteed

Energy storages will reduce hardware failures, equalizing power plant equipment loads. Moreover, they can replace the hot reserve provided by HPPs and, hence, reduce the fuel consumption.

5. Reducing maintenance costs

Growing manufacturing lead to the power peaks overloading the feeding substations. Deploying an energy storage at a substation or at a customer's place of business will smooth these peaks, reducing the load on the grid.

6. Bridging independent grids

An energy storage allows one to accumulate energy from grid A at the time of low demand and send it grid B when it is necessary.
Why would anyone need to build the industrial pilot LWS?
Hardware failures lead to the most serious consequences in the power industry in particular, which makes it the most conservative sector from the technical standpoint. For that reason, no solution that concerns electric energy generation, including energy storage, can be deployed at the industrial level if only its theoretical (not factual) advantages are considered.

The only way to confirm the reliability and efficiency of LWS can be a positive practical experience of its deployment as a part of a grid, and the scale of this experimental installation should convincingly demonstrate that further enlargement to the industrial scale will not cause any reliability or safety issues.

Building an experimental facility in a way it utilizes industrial-size constructional, mechanical and electronic solutions will minimize such a risk.

Goes without saying, building such an experimental facility should be preceded by endurance tests to estimate the lifetime of the components in question, but testing the way they operate together is even more necessary for convincing our future customers.

Short construction cycle and fast facility commissioning are not possible without a team of subcontractors who provide high-quality works and components. Building the industrial pilot is an only reliable way for selecting proper candidates to make up such a team.
What PHS have limitations that the LWS do not have?
а) Unlike PHS, LWS requires no relief elevations;

b) In case of a failure, LWS causes no hazard to the surrounding environment;

c) Unlike PHS, LWS is environmentally friendly;

d) LWS requires no water supply;

f) LWS land take is much smaller than that of PHS.
Why don't you build it in a pit?
Whether you build LWS in a pit or on a surface the load-carrying framework would remain the same. There is a limitation put by the ropes' lifting capacity. The ropes have to endure a huge amount of working cycles going through multiple pulleys, so they should be flexible enough. That limits the mass of a single weight because the higher ropes' lifting capacity the lower its flexibility. And since a single weight is actually a set of smaller weights the bearing frame comprises a mesh of vertical bearing elements and their connectors that form shafts to embrace a single weight. In this respect, the pit wall would only be able to serve as wind protection and no more. However, economically speaking, a choice between a pit of a few hundred meters in depth and a monolithic concrete wall of lower than one-meter thickness is apparent. Additionally, for a pit to serve as wind protection, its walls should be vertical, which dramatically increases its high cost.

However, we may also consider the case of having a pit of a right size in a right place. The lower the storage's capacity the easier it is to find such a pit to save on the cost of the wind shield. If you have such a pit, you may have an LWS built with rectangle cross-section and even at lower cost.
If you cannot find the answer to your question,
please feel free to ask it here
Your question