# Researchers Unveil Bit2Watt: A New Threat to Data Center and Grid Stability

*Published July 26, 2026*
*Source: [https://thehackernews.com/2026/07/new-bit2watt-attack-could-let-cloud.html](https://thehackernews.com/2026/07/new-bit2watt-attack-could-let-cloud.html)*

## Executive Summary

Zhejiang University researchers have unveiled Bit2Watt, a technique that lets cloud tenants disrupt power grids by manipulating GPU workloads without needing exploits. This poses a new risk to grid stability and highlights the need for cloud providers to consider potential mitigation strategies.

## Article

Researchers from Zhejiang University have introduced a novel threat called Bit2Watt that could allow cloud tenants to disrupt power grids using GPU workloads without needing any exploits or security breaches. Their study, which will be presented at the CHES 2026 hardware-security conference, demonstrates how oscillating GPU workloads can cause significant fluctuations in data center power consumption, potentially destabilizing the power grid. This technique does not rely on compromised systems or malware; instead, it utilizes legitimate computational actions to achieve its effects. The power draw of a GPU is directly tied to its computational activity. By alternating between high and low-intensity tasks, a controllable power oscillation can be created. The researchers tested two methods: SWMA and LTMA. SWMA uses a custom CUDA kernel to switch between compute modes, while LTMA embeds this modulation in real LLM training runs. Both methods were shown to produce significant power modulation frequencies, which could pose a risk to grid stability if executed on a large scale. In a worst-case simulation, the impact of 1,000 GPUs synchronized in power modulation was modeled, demonstrating potential grid instability. While the researchers acknowledge that achieving perfect synchronization across a fleet of cloud GPUs remains a challenge, the potential for disruption is clear. The research emphasizes the need for cloud providers to be aware of such risks and highlights the importance of engaging with them for further validation and mitigation strategies.