Mainstay

Battery systems for industrial and large commercial sites

Lower electricity costs.
Backup power
where it matters.

Mainstay designs battery systems for factories, food processors, cold storage and other large commercial sites. A battery lowers your electricity bill and keeps key equipment running when the power goes out. You can buy it or finance it.

Select an exact match. No bill or account needed.

At night, the battery charges from the grid while the building is quiet.

Illustration of one site, not measured data.

Who we work with

  • Metals

    Foundries, forges and steel processors. Furnaces and large motors set a high peak.

  • Plastics and rubber

    Extruders and molding presses that run around the clock.

  • Food processing and cold storage

    Refrigeration that runs all day, and stock that spoils if it stops.

  • Concrete, glass and building products

    Crushers, mixers and conveyors that start together each shift.

How a project works

  1. 1

    Enter your address

    We look up your utility and building, estimate how much power it uses, and suggest battery sizes. No bill needed.

  2. 2

    Get a proposal

    Send us a year of electricity bills. We send back the equipment, the price, and what it should save.

  3. 3

    Installation

    We manage installation with the contractors named in your proposal.

  4. 4

    Operation

    The battery runs on a schedule set by your electricity rates and how much backup you want to keep. We arrange monitoring and maintenance.

Plan your system

See the grid
near your address

Your utility and electricity rate decide whether a battery makes sense. Look up your utility and the power plants and transmission lines near you, from public records.

View grid data
Plants of 500 MW and above · Transmission of 345 kV and above
EIA and HIFLD records. Map context, not a connection-capacity assessment. Sources

Buy it outright
or finance it

Own the system

Buy the equipment and keep the project economics. Your proposal sets who installs, operates, and maintains the system.

Finance the system

Finance the equipment instead of paying the full cost upfront. Your proposal sets the equipment, payment terms, and eligibility.

Tell us about your project

Before you choose a battery

What does a commercial battery do?

It stores electricity for later use. Depending on your tariff and load, it can reduce peak grid demand or shift when you buy electricity. A system designed for backup can also support selected equipment during an outage.

Can it keep my whole building running in an outage?

That depends on the equipment, load and duration. We start with what needs to keep running. Backup requires suitable transfer and protection equipment, and may cover selected circuits rather than the whole building.

Can I buy or finance the system?

You can buy the equipment or use financing. Your written proposal sets payment terms, eligibility, operating responsibilities, and any performance commitments.

All questions & answers

Start with
your address

Select an exact match. No bill or account needed.

We currently serve PJM. Prefer to talk first? Contact us.