Ørsted Inaugurates 250MW/500MWh Tesla Megapack Storage Project ‘Old 300 Storage’ in Texas for Commercial Operation

August 9, 2026

BASENOR USA

Overview

Ørsted announced the commercial operation of its 250 MW/500 MWh ‘Old 300 Storage’ BESS in Needville, Texas, fully integrated into the ERCOT grid. Utilizing Tesla Megapacks, the project enhances grid stability by supplying power during peak demand and expands Ørsted’s U.S. onshore energy portfolio. This facility is capable of continuously discharging 250 megawatts of power for two hours.

In Depth

Key Findings

Ørsted announced the commercial operation of its 250 megawatt (MW) / 500 megawatt-hour (MWh) battery energy storage system (BESS), ‘Old 300 Storage,’ located in Needville, Texas, which commenced operations on August 5, 2026. This large-scale project is fully integrated into the Texas Electric Reliability Council of Texas (ERCOT) grid, contributing significantly to grid stabilization. The facility utilizes Tesla Megapacks, marking a substantial expansion of Ørsted’s battery energy storage ventures in the United States.

Technical & Operational Details

The Old 300 Storage facility is rated at 250 MW output and 500 MWh capacity, meaning it can continuously supply 250 megawatts of power for two hours before depletion. The deployed Tesla Megapacks are integrated units combining battery modules, inverters, thermal management, and control systems, which simplifies on-site assembly and enables rapid deployment. These Megapacks were manufactured at Tesla’s Gigafactory in Lathrop, California. The system plays a crucial role in enhancing the reliability of the ERCOT grid and mitigating the intermittency of renewable energy sources by supplying power during peak demand periods.

Background & Context

The ERCOT grid in Texas faces intense pressure to stabilize its power supply due to rapidly increasing electricity demand and the growing integration of renewable energy sources. As a global leader in renewable energy generation, Ørsted is reinforcing its investments in battery storage to complement its wind and solar power projects. The Old 300 Storage project adds to Ørsted’s portfolio of over 6 GW of operational U.S. onshore energy projects, affirming the company’s commitment to sustainable energy transition. The commissioning of such large-scale BESS facilities represents a critical step towards modernizing and decarbonizing electricity grids.

Strategic Significance & Outlook

The commercial operation of large-scale BESS facilities like Old 300 Storage will not only improve grid stability and reliability in Texas but also serve as a model for similar projects in other regions. Integrated solutions like the Tesla Megapack contribute to shorter installation times and operational efficiencies, thereby boosting the overall growth of the energy storage market. Ørsted plans to further expand its battery energy storage portfolio, expecting to play an indispensable role in the broader adoption of renewable energy and the strengthening of power grids. This project also holds potential as part of virtual power plants (VPPs) designed to address the escalating power demands from AI data centers.

Source: https://www.basenor.com/blogs/news/old-300-storage-6-details-that-matter-about-teslas-newest-megapack-site

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