Battery energy storage systems
Using innovative tools to reduce costs and support reliability
Battery energy storage systems (BESS) store electricity for later use. MTE uses battery storage as part of our energy portfolio to help manage energy costs, support reliability, and respond when additional energy is needed.
Members and businesses may also use smaller battery storage systems to support their own energy needs, especially when paired with solar or other energy technology. Whether used by MTE or by a member, battery storage can help shift energy use to a better time and support a more flexible electric grid.
What is a battery energy storage system?
A battery energy storage system stores electricity for later use. For MTE, that means charging the system when energy demand and costs are lower, then using the stored energy during peak demand periods when electricity costs are higher.
For members and businesses, smaller battery storage systems can serve a similar purpose on a smaller scale. They can store energy for later use and help support personal, home, or business energy goals. While the size and setup may differ, the basic idea is the same: the BESS holds electricity until it is needed.
How MTE uses battery storage
Our battery storage energy systems help MTE reduce monthly wholesale electricity purchases during peak demand hours. This is done through a process called energy time-shifting for distributed generation.
With energy time-shifting, a BESS charges when TVA rates are lower during low-use hours. It can then discharge energy when demand costs are higher. This helps MTE use energy stored during lower-cost times instead of buying more electricity during higher-cost peak periods.
How members benefit
MTE members benefit because our BESS helps the cooperative manage energy costs more effectively. By charging the system during off-peak periods and using that stored energy during peak demand, MTE can reduce costs associated with higher on-peak energy demand.
MTE's BESS helps the cooperative save tens of thousands of dollars annually. These savings are then used to improve affordability and reliability for our members.
How members and businesses are using battery storage
MTE’s BESS is larger than the systems most members or businesses would use, but the basic idea is the same. Battery storage saves electricity so it can be used later.
Some members and businesses use smaller battery storage systems to support their own energy needs. These systems can help them better manage energy use and explore new ways to support their homes, operations, or long-term energy goals.
A common use case for smaller battery systems is to support PV solar systems. These solar arrays often use battery technology to store energy during the day for use at night or on low-production days.
As battery storage becomes more common, MTE is learning how this technology can support members, businesses, and the electric grid.
MTE’s commitment to members
MTE exists to serve our members and make their lives better. As one of the largest electric cooperatives in the nation, MTE is always looking for ways to improve the reliability and affordability of electricity while serving as a trusted energy technology expert. Battery storage is one more tool that can help MTE support those goals.
Common questions about battery storage
What is a battery energy storage system?
A battery energy storage system, also called a BESS, stores electricity so it can be used later.
Why is MTE using battery storage?
MTE uses battery storage to reduce energy demand charges from TVA, improve demand response when additional energy is needed, and evaluate energy technology that may help support the electric system.
How does the BESS help reduce costs?
The BESS can charge when TVA rates are lower during low-demand hours. It can then discharge stored energy during peak-demand hours, when energy costs are higher.
How do members benefit from MTE’s BESS?
Members benefit when MTE can better manage wholesale electricity costs and use innovative tools that support reliability and affordability.
Are members and businesses using battery storage too?
Yes. Some members and businesses use smaller battery storage systems to support their own energy needs. These systems store electricity so it can be used later.
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