Pumped Thermal Energy Storage Patents

Pumped thermal energy storage patents cover turbomachinery innovations; heat-storage innovations; cycle/efficiency innovations; and system/grid innovations — with IP held by long-duration-storage companies, power/turbomachinery companies, and research organizations. WHY PUMPED THERMAL ENERGY STORAGE: PUMPED THERMAL ENERGY STORAGE (PTES) — also called a 'CARNOT BATTERY' — stores electricity as a TEMPERATURE DIFFERENCE rather than in chemistry: to CHARGE, it uses cheap (surplus renewable) electricity to run a HEAT PUMP that moves heat from one reservoir to another, creating a HOT store (e.g., molten salt at high temperature) and a COLD store (e.g., a chilled antifreeze/fluid); to DISCHARGE, it runs the same machinery in REVERSE as a HEAT ENGINE, letting heat flow from the hot store to the cold store through a turbine to regenerate electricity; because it stores energy as heat and cold in CHEAP, abundant media (MOLTEN SALT, rock/gravel, water, or CO2), PTES uses NO rare/critical materials, does NOT degrade with cycling, and sites anywhere — making it a candidate for LONG-DURATION (many-hour to multi-day) GRID storage to firm renewables; the defining CHALLENGE is ROUND-TRIP EFFICIENCY: because energy passes through BOTH a heat pump (charge) AND a heat engine (discharge), the losses of each COMPOUND, so recovering enough of the stored electricity is the central problem; the brutal CHALLENGES: the TURBOMACHINERY (the COMPRESSORS and EXPANDERS that act as the heat pump and heat engine — their efficiency and reversibility — the HEART), the HEAT-STORAGE (the hot and cold thermal stores, heat exchangers, and insulation), the CYCLE/EFFICIENCY (the thermodynamic cycle and the all-important ROUND-TRIP EFFICIENCY — the central make-or-break), and the SYSTEM/GRID (integration and operation for long-duration storage). MAJOR PLAYERS: MALTA INC (a Google X / Breakthrough Energy spinout — molten-salt hot store + chilled-liquid cold store, Brayton cycle), ENERGY DOME (a CO2-based thermo-mechanical 'CO2 Battery'), plus power/turbomachinery companies and academia. Turbomachinery, heat-storage, cycle/efficiency, and system/grid are the core PTES patent domains. (Note: MACHINES (apparatus), THERMAL STORES (apparatus), and CYCLES/processes are §101-RESILIENT — so claim turbomachinery, heat stores, cycles, and systems.)

Turbomachinery innovations; heat-storage innovations; reversible-machine innovations; and thermal-store innovations represent core PTES patent domains — and the turbomachinery (the heart) and the heat-storage (the medium) are the foundational, high-value, §101-resilient capabilities. TURBOMACHINERY PATENTS: the HEART — the HEAT PUMP / HEAT ENGINE (the COMPRESSORS and EXPANDERS that, on charge, pump heat to build the temperature difference, and on discharge, run as a heat engine to regenerate power — their efficiency is the dominant lever on round-trip efficiency), REVERSIBILITY (machinery or configurations that run efficiently in both directions, or efficient separate charge/discharge trains), and HIGH-EFFICIENCY DESIGN (aerodynamics, sealing, and operation that cut the compounding losses); turbomachinery methods are core, high-value, DISTINCTIVE IP, §101-resilient (the heat-pump/heat-engine COMPRESSORS/EXPANDERS, reversibility, and high-efficiency design are the central, most contested, defensible IP, since the machinery's efficiency directly determines round-trip efficiency — the make-or-break). HEAT-STORAGE PATENTS: the MEDIUM — HOT STORE (high-temperature storage in MOLTEN SALT, rock/gravel, refractory, or other cheap media), COLD STORE (low-temperature storage in chilled antifreeze, ice/phase-change, or cryogenic media), HEAT EXCHANGERS (transferring heat into/out of the stores efficiently — central to efficiency and cost), and INSULATION/STRATIFICATION (retaining the temperature difference cheaply); heat-storage methods are core, high-value, DISTINCTIVE IP, §101-resilient (the HOT and COLD thermal stores, heat exchangers, and insulation are core, contested, defensible IP, since cheap, low-loss, high-temperature-difference storage is exactly what makes PTES cheap and efficient). REVERSIBLE-MACHINE PATENTS: machinery serving as both heat pump and heat engine; reversible-machine methods are high-value IP, §101-resilient (reversibility cuts capital cost). THERMAL-STORE PATENTS: cheap hot/cold thermal storage media and vessels; thermal-store methods are high-value IP, §101-resilient (the store is the energy reservoir). Turbomachinery, heat-storage, reversible-machine, and thermal-store are the highest-value core IP because the machinery's efficiency and the cheap thermal stores are exactly what set PTES's round-trip efficiency and cost.

Cycle/efficiency innovations; system/grid innovations; Carnot-battery innovations; and long-duration-storage innovations represent additional PTES patent domains — and the cycle/efficiency (the make-or-break) and the system/grid (the use) turn the machinery into a viable storage plant. CYCLE / EFFICIENCY PATENTS: the MAKE-OR-BREAK — the THERMODYNAMIC CYCLE (the cycle choice and layout — recuperated BRAYTON (Malta), transcritical CO2 (Energy Dome), Rankine, or others — that maximizes round-trip efficiency), ROUND-TRIP EFFICIENCY (configurations, recuperation, and loss-management that raise the all-important fraction of stored electricity recovered — the single most important metric), and WASTE-HEAT INTEGRATION (boosting efficiency by adding/using external heat or cold, e.g., co-located industrial heat); cycle methods are core, high-value, DISTINCTIVE IP, §101-resilient when tied to the system (the THERMODYNAMIC CYCLE and ROUND-TRIP EFFICIENCY improvements are the central, contested, defensible IP, since round-trip efficiency is what determines whether PTES is competitive — the make-or-break). SYSTEM / GRID PATENTS: the USE — SYSTEM DESIGN (integrating the machinery, stores, and controls into a plant), CONTROL/OPERATION (charge/discharge control, part-load operation, and grid dispatch), LONG-DURATION STORAGE (sizing and operating for many-hour to multi-day discharge to firm renewables — the target market), and HYBRID/CO-LOCATION (pairing with thermal generation, industrial heat, or other assets); system methods are core, high-value, DISTINCTIVE IP, §101-resilient when tied to the system (SYSTEM design, CONTROL, and LONG-DURATION grid integration are core value, since the product is a grid-scale, long-duration storage plant). CARNOT-BATTERY PATENTS: electricity-to-heat-to-electricity Carnot-battery systems; Carnot-battery methods are high-value IP, §101-resilient when tied to the system (the Carnot battery is the paradigm). LONG-DURATION-STORAGE PATENTS: PTES configured for long-duration grid storage; long-duration-storage methods are high-value IP, §101-resilient when tied to the system. Cycle/efficiency, system/grid, Carnot-battery, and long-duration-storage are the highest-value IP because round-trip efficiency and the long-duration grid system turn the machinery into a competitive storage plant.

Pumped thermal energy storage startup IP strategy must navigate the machine-store-and-cycle-are-§101-resilient (PTES IP is MACHINE (apparatus), THERMAL STORE (apparatus), and CYCLE IP — strongly §101-RESILIENT — so turbomachinery, heat-store, cycle, and system claims are strong), the round-trip-efficiency-is-the-central-make-or-break (because energy passes through BOTH a heat pump (charge) and a heat engine (discharge), the losses COMPOUND — so ROUND-TRIP EFFICIENCY is the central make-or-break and the single most decisive metric/IP, since PTES must recover enough stored electricity to compete with batteries and pumped hydro), the turbomachinery-efficiency-dominates-round-trip-efficiency (the COMPRESSORS/EXPANDERS (heat pump + heat engine) are where most of the loss happens — so high-efficiency turbomachinery IP is the most decisive technical IP, directly setting round-trip efficiency), the cheap-abundant-materials-and-no-degradation-are-the-strategic-advantage (PTES stores energy in CHEAP, abundant media (molten salt, rock, water, CO2) with NO critical minerals and NO cycle degradation — so its strategic advantage is low-cost, durable, long-duration storage decoupled from battery supply chains — lean on this vs lithium-ion), the long-duration-grid-storage-is-the-target-market (PTES is HEAVY infrastructure with modest round-trip efficiency — useless for short-duration/mobility — so the target is stationary, LONG-DURATION (many-hour to multi-day) GRID storage, where low $/kWh and durability beat efficiency), the cycle-and-medium-choice-is-a-key-technical-and-IP-fork (Brayton + molten salt (Malta) vs transcritical CO2 (Energy Dome) vs Rankine/others — distinct cycles, media, and machinery with different IP — pick and protect the right architecture), the waste-heat-and-co-location-can-boost-efficiency-and-economics (adding external HEAT or COLD (industrial waste heat, co-located thermal assets) can lift round-trip efficiency and economics — a clever strategic/IP angle), the component-vs-system-vs-project-business-models (a startup can sell COMPONENTS (turbomachinery, heat exchangers, stores), an integrated STORAGE SYSTEM, or operate PROJECTS — the model is a key choice with different IP and capital needs), the incumbent-and-FTO (Malta Inc, Energy Dome, power/turbomachinery majors, and academia hold PTES IP — so a startup needs a genuinely novel turbomachinery/store/cycle/system edge and FTO across the architectures), the demonstration-efficiency-and-cost-are-as-decisive-as-patents (PTES is capital-intensive and early — so DEMONSTRATED round-trip EFFICIENCY, durability, and $/kWh COST at scale are as decisive as patents, since buyers need proof it pencils out), and the demonstrated-round-trip-efficiency-cost-and-durability-decide (PTES is proven by demonstrated ROUND-TRIP EFFICIENCY, $/kWh COST, and DURABILITY — so demonstrated, validated economics are decisive, more than patents alone), and a landscape where turbomachinery, heat storage, cycle, and system are the durable assets; understand that round-trip efficiency is the central make-or-break and turbomachinery efficiency dominates it, so the durable startup IP is in high-efficiency turbomachinery, cheap low-loss thermal stores, efficient cycles, and long-duration systems — with high-efficiency reversible turbomachinery or a better cycle/store often the real moat, and that §101-resilient machine/store/cycle IP, demonstrated efficiency/cost/durability, and FTO matter as much as patents; identify whitespace in turbomachinery, thermal stores, cycles, and integration. PUMPED THERMAL ENERGY STORAGE STARTUP IP STRATEGY: TURBOMACHINERY, HEAT-STORAGE, CYCLE/EFFICIENCY, AND SYSTEM/GRID ARE THE IP: patent turbomachinery, stores, cycles, and systems — apparatus + process claims (§101-resilient); MACHINE-STORE-AND-CYCLE-ARE-§101-RESILIENT: MACHINE + THERMAL STORE (apparatus) + CYCLE IP — strongly §101-RESILIENT; ROUND-TRIP-EFFICIENCY-IS-THE-CENTRAL-MAKE-OR-BREAK: heat-pump (charge) + heat-engine (discharge) losses COMPOUND — ROUND-TRIP EFFICIENCY the central make-or-break + most decisive metric/IP; TURBOMACHINERY-EFFICIENCY-DOMINATES-ROUND-TRIP-EFFICIENCY: the COMPRESSORS/EXPANDERS are where most loss happens — high-efficiency turbomachinery the most decisive technical IP; CHEAP-ABUNDANT-MATERIALS-AND-NO-DEGRADATION-ARE-THE-STRATEGIC-ADVANTAGE: cheap media (molten salt/rock/water/CO2), NO critical minerals, NO cycle degradation — low-cost durable storage decoupled from battery supply chains; LONG-DURATION-GRID-STORAGE-IS-THE-TARGET-MARKET: HEAVY infrastructure + modest efficiency — target stationary LONG-DURATION GRID storage (low $/kWh + durability beat efficiency); CYCLE-AND-MEDIUM-CHOICE-IS-A-KEY-TECHNICAL-AND-IP-FORK: Brayton+molten salt (Malta) vs transcritical CO2 (Energy Dome) vs Rankine — distinct cycles/media/machinery/IP — pick + protect; WASTE-HEAT-AND-CO-LOCATION-CAN-BOOST-EFFICIENCY-AND-ECONOMICS: adding external HEAT/COLD (industrial waste heat) lifts efficiency + economics — a clever angle; COMPONENT-VS-SYSTEM-VS-PROJECT-BUSINESS-MODELS: sell COMPONENTS, a STORAGE SYSTEM, or PROJECTS — a key choice; INCUMBENT-AND-FTO: Malta Inc/Energy Dome/turbomachinery majors + academia — need a novel edge + FTO across architectures; DEMONSTRATION-EFFICIENCY-AND-COST-ARE-AS-DECISIVE-AS-PATENTS: capital-intensive + early — DEMONSTRATED efficiency/durability/$/kWh at scale as decisive as patents; DEMONSTRATED-ROUND-TRIP-EFFICIENCY-COST-AND-DURABILITY-DECIDE: proven by ROUND-TRIP EFFICIENCY/$/kWh COST/DURABILITY — demonstrated economics decisive; WHEN TO PATENT: NOVEL TURBOMACHINERY/STORE/CYCLE/SYSTEM WITH DATA: file once it shows data (turbomachinery + store + round-trip efficiency + system) — apparatus + process claims; demonstrated round-trip efficiency, $/kWh cost, and durability are the critical PTES IP metrics; KEY FTO CHECKLIST: Malta Inc/Energy Dome/turbomachinery majors + academia; turbomachinery (HEAT PUMP-HEAT ENGINE COMPRESSORS/EXPANDERS/reversibility/high-efficiency design — §101-resilient, the heart); heat-storage (HOT store-MOLTEN SALT-rock/COLD store-chilled-phase-change/heat exchangers/insulation — §101-resilient, the medium); reversible-machine; thermal-store; cycle/efficiency (THERMODYNAMIC CYCLE-Brayton-CO2-Rankine/ROUND-TRIP EFFICIENCY/waste-heat integration — §101-resilient tied to system, the make-or-break); system/grid (system design/control/LONG-DURATION integration/co-location — tie to system); Carnot-battery (the paradigm); long-duration-storage; machine + store + cycle the §101-resilient strength; round-trip efficiency the central make-or-break; turbomachinery efficiency dominates round-trip efficiency; cheap abundant materials + no degradation the strategic advantage; long-duration grid storage the target market; cycle + medium choice a key fork; waste-heat + co-location boost efficiency + economics; component vs system vs project business models; incumbent + FTO; demonstration + efficiency + cost as decisive as patents; demonstrated round-trip-efficiency + cost + durability decide.