Network expansion

Network expansion

Network expansion includes the expansion, reinforcement, and digitization of the electricity grid in order to manage the increasing feed-in of renewable energy, new electricity loads, and the requirements of sector coupling (e.g. e-mobility, heat pumps).

How it works

Electricity grids were historically built for centralized power plants — but today decentralized generators (e.g. PV, wind) are being installed throughout the country. At the same time, consumption peaks are increasing due to new electricity applications.

In practical terms, network expansion includes:

 • new power lines and substations
 • reinforcement of existing lines
 • expansion of medium- and low-voltage networks
 • digital infrastructure (e.g. smart meters, grid monitoring)

The goal is to enable bidirectional power flows and ensure security of supply despite volatile generation.

Typical applications

 • Connection of PV systems or Battery Energy Storage Systems (BESS) at company sites
 • Implementation of prosumer models (electricity producer and consumer)
 • Integration of rural renewable energy potential (e.g. Agri-PV)
 • Grid connection for EV charging infrastructure or heat pumps
 • Implementation of sector coupling projects

Key figures & influencing factors

 • Line capacity (MW): maximum transmission capacity
 • Grid connection time: often 6–36 months (depending on the region)
 • Costs: depending on the voltage level, approx. €100,000 to €2 million per km
 • Germany’s investment needs: more than €600 billion expected by 2045
 • Approval procedures: route planning, environmental compatibility, public participation
 • Digitalization: increasingly important for control and grid integration

Summary

Network expansion is a key success factor of the energy transition: only with powerful and flexible grids can PV, storage, and new electricity consumers be integrated reliably.

Without sufficient grid capacity, there is a risk of project delays, redispatch costs, and regional congestion.