Google Battery Storage-Shift Pilot Moves 9.2 GWh

Quintrace, esVolta and LevelTen Energy announced results on September 17, 2026, from a Google-sponsored battery storage-shift pilot that moved 9.2 GWh of solar-charged electricity across different hours during a three-month test at two U.S. battery projects.

The pilot used esVolta’s 240 MW/480 MWh Anole battery and 100 MW/200 MWh Burksol battery. Google identified daily periods when its electricity demand was expected to exceed its available renewable supply, while the batteries charged during a defined midday window and discharged during an evening shortfall window.

The test did not give Google operational control of the batteries. EsVolta retained dispatch authority and could respond to electricity prices or grid emergencies outside the agreed windows. The companies did not disclose the contract price, revenue earned by the batteries, hourly dispatch dataset or the emissions effect of the transactions.

Battery storage-shift pilot combines power and hourly certificates

The companies’ results announcement describes a structure in which Google contracted to time-shift environmental attributes it already owned rather than tolling the batteries or purchasing new generating capacity. EsVolta operated the physical storage, Quintrace verified charging and discharging, and LevelTen managed registry accounts and the transaction framework.

The environmental attributes were represented by hourly time-stamped granular certificates. Conventional renewable energy certificates document the non-power attributes associated with renewable generation. The U.S. Environmental Protection Agency explains that one renewable energy certificate generally represents the attributes of one megawatt-hour of renewable electricity delivered to the grid.

Hourly certificates add a time stamp so a buyer can distinguish renewable generation produced at midday from electricity consumed during an evening demand period. In this pilot, Quintrace tracked the solar attributes through battery charging and discharge and applied dynamic loss calculations so the certificate volume reflected energy delivered after storage losses.

The batteries remained available for market operations

The commercial design differs from a conventional battery tolling agreement. Google specified charging and discharging windows tied to forecast clean-energy gaps, but esVolta kept operational control. That separation allowed the batteries to pursue other market opportunities and respond to grid conditions when they were not committed to the storage-shift windows.

The 9.2 GWh figure is the combined energy charged and discharged during the respective windows over three months, according to the announcement. It is not additional battery capacity, annual generation or electricity delivered directly to a Google data center. The Anole and Burksol nameplate ratings total 340 MW/680 MWh.

Independent coverage by pv magazine confirmed the disclosed project capacities, pilot volume and contract structure. The report also noted that neither the Science Based Targets initiative nor the GHG Protocol currently requires every company to achieve hourly renewable matching.

The model targets a gap in corporate clean-energy procurement

Annual renewable matching can pair a company’s yearly electricity use with renewable generation produced at different times. Hourly matching asks a harder question: whether carbon-free resources were available during the same hours that the company consumed electricity. Storage can move physical electricity across hours, while granular certificates are intended to preserve the timing information attached to the renewable attributes.

The approach complements project-based procurement rather than replacing it. Google recently backed a West Virginia solar-and-storage project combining lithium-ion and long-duration zinc batteries. It has also used firm generation contracts, including a Finnish nuclear power agreement, to address hours when wind and solar output may be unavailable.

For battery owners, a verified storage-shift contract could create an environmental-attribute revenue stream alongside energy and grid-service revenues. Whether that revenue becomes financeable at scale will depend on standard contract terms, accepted accounting rules, auditability and enough buyer demand to produce durable pricing.

Commercial scale still requires more evidence

The battery storage-shift pilot demonstrates that existing grid-connected batteries can follow defined time windows while hourly certificates are tracked through charging, losses and discharge. It does not yet establish the economics of a scaled market or prove that the transactions reduce emissions in every operating hour.

The next useful disclosures would include hourly charging and discharge data, certificate retirement records, contract pricing, treatment of battery degradation, methodology for marginal emissions and results from repeated transactions involving more buyers and storage operators. Those details will determine whether the pilot becomes a replicable procurement tool or remains a limited demonstration.