Nightpeak Energy has completed the second phase of its Bocanova battery storage development in Brazoria County, Texas, bringing the site to 300 megawatts of power and 600 megawatt-hours of nominal energy capacity as growing data-center demand puts pressure on the state’s electricity grid. The company announced the milestone October 13, after Bocanova 2 entered commercial operation September 17, 2026.

The new phase adds 150 MW and 300 MWh of lithium-ion battery storage to an initial 150 MW / 300 MWh facility that began operating in August 2025. Nightpeak uses Tesla Megapack 2 XL systems at Bocanova 2 and has secured a long-term offtake agreement with an unnamed investment-grade counterparty.

What 300 MW and 600 MWh mean

The batteries connect to the Electric Reliability Council of Texas (ERCOT) market, allowing stored electricity to be discharged when the grid needs it. The developer has not disclosed any agreement to supply a particular Bitcoin mine or AI data center directly.

At its full 300 MW discharge rating, 600 MWh represents approximately two hours of output before accounting for operating limits and conversion losses. Megawatts measure the rate at which power is delivered; megawatt-hours measure how much electrical energy is stored.

That distinction is important for computing customers. A battery can help respond to high prices, demand spikes, generator outages or changing renewable production, but a two-hour system does not provide continuous, round-the-clock primary electricity without recharging.

Financing and data-center demand

PV Magazine USA independently reported that the second phase doubled Bocanova’s total storage capacity from 300 to 600 MWh. Nightpeak’s company news page also records the October announcement.

Nightpeak said MUFG Bank supplied a tax-equity bridge loan and construction-to-term financing, while U.S. Bank provided tax equity. The developer did not disclose the total financing amount or the contract’s electricity price. Neither the name of the offtaker nor actual discharge revenue was published.

The company’s investment reflects a broader need for flexible electricity resources as Texas accommodates AI computing, industrial growth and renewable power. Unlike a natural-gas turbine or a solar farm, a standalone battery is not a primary source of new energy; it shifts previously generated electricity from one period to another.

Bocanova’s two operating phases are separate from Nightpeak’s proposed 620 MW Old Ocean Data Center elsewhere in Brazoria County. No public evidence reviewed establishes that Bocanova is dedicated to that proposed campus. Actual operational storage also contrasts with proposed power complexes whose commissioning remains uncertain.

The next useful measurements will be Bocanova’s delivered energy, operating availability, round-trip efficiency and performance during ERCOT demand peaks. Those figures would show how the installed capacity contributes to reliability beyond its nameplate ratings.

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