🌍 The Future of Energy Storage – Overview, Evaluation & Decision-Making Tools

1. How much Energy-Storage do we actually need, when we need it, which opportunities does nature grant, in the existing and possibly continually developing world?


If there were future technologies, like a globally stretching energy-net with trust in other decision-makers, efficient and purpose-fitting organisation, people executing their personally fulfilling lives and not giving in to permanent short-term thinking... etc... how well could we all be off/doing?



And how much if that's not (yet) the case? For example from the point we are currently at.




  • Intermittent nature of renewables (e.g. solar and wind)
  • Ensuring supply security: electricity, heating, mobility, industry
  • Matching energy demand and supply
  • Key to climate neutrality and grid stability


2. What Types of Energy Storage Technologies Exist?

A) Electrical Storage

  • Lithium-ion batteries
  • Sodium-ion batteries
  • Redox flow batteries
  • Supercapacitors

B) Thermal Storage

  • Sensible heat storage (e.g. water tanks)
  • Latent heat storage (e.g. phase change materials)
  • Thermochemical storage

C) Mechanical Storage

  • Pumped hydro storage
  • Compressed air energy storage (CAES)
  • Flywheels

D) Chemical Storage

  • Hydrogen (via electrolysis, reconversion)
  • Methanation / Power-to-Gas
  • Ammonia as energy carrier
  • Synthetic fuels


3. Key Evaluation Criteria for Storage Technologies

  • Storage duration (short-, medium-, long-term)
  • Round-trip efficiency
  • Scalability / location dependency
  • Cost per kWh / investment cost
  • Material demand & environmental impact
  • Grid integration potential
  • Suitability for different energy sectors (electricity, heat, industry, transport)

4. Where Does Each Technology Make the Most Sense?

  • Residential homes
  • Urban districts & cities
  • Industrial applications
  • Grid-level storage & backup
  • District heating
  • Hydrogen economy

5. Future Questions & Open Topics

  • Which technologies should we prioritize?
  • Where is more research needed?
  • How can we align technological development with societal benefit?
  • What is the role of regulation and market design?