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How StratoSolar stores energy at a low cost

  • Low cost buoyant support platform in the stratosphere
  • Off the shelf motor generator and winch technology
  • Weight on cable stores 54Wh/kg at 20km altitude
  • Fast response time for load following and peaking
  • better than 85% round trip efficiency
  • Long life exceeding 15,000 cycles or thirty years without degradation
  • No dependence on geography. Hills or caverns are not required
  • Scale-able from 1MW to many GW in increments
  • Same buoyant platform elements can provide PV generation for a complete dispatch-able electricity solution
  • Capital cost less than $100/kWh and/or $1/W in production

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