Germany Builds 50 MW Plant to Turn Surplus Wind Into Heat

Germany just found a brilliant way to use the wind and solar power that would otherwise go to waste.

Energy provider Enercity is constructing a 50 megawatt power-to-heat plant in Hanover that converts surplus renewable electricity into heat for the city's district heating network. The facility addresses a growing challenge: as Germany adds more wind and solar power, the grid sometimes generates more electricity than it can handle.

When renewable generation peaks, electricity prices can drop below zero and strain the grid. Enercity's new system swoops in during these moments to absorb the excess power and convert it into heat that warms thousands of homes.

The technology works like a giant electric water heater. During periods of high renewable generation or extreme cold, the system heats water to temperatures reaching 120 degrees Celsius and feeds it directly into Hanover's district heating network or stores it for later use.

Enercity already operates a 20 megawatt electrode boiler at the historic Herrenhausen power plant, which came online in 2020. That system is being upgraded to 26 megawatts, and the new 50 megawatt facility will more than triple the company's power-to-heat capacity.

The systems aren't designed to run constantly. Instead, they activate precisely when needed, providing heat during cold snaps or soaking up renewable electricity during particularly windy or sunny periods.

The Ripple Effect

This project is part of Hanover's ambitious plan to decarbonize its heating system and eliminate coal by the end of 2027. Once complete, the city expects the vast majority of its district heating to come from climate-neutral sources.

The strategy combines multiple technologies working together. Alongside power-to-heat systems, Enercity is deploying large-scale heat pumps that extract warmth from river water and wastewater treatment plants, plus expanded waste heat recovery from industrial processes.

The approach offers a blueprint for other cities wrestling with similar challenges. By turning a grid management problem into a heating solution, communities can phase out fossil fuels faster while making renewable energy more reliable.

Enercity isn't stopping with this facility. The company plans to build another power-to-heat plant with double the capacity, 100 megawatts, in the nearby Rodenbruch district.

Cities worldwide are watching as Hanover transforms its heating infrastructure, proving that the renewable energy transition can solve multiple problems simultaneously.