Are there any site energy system integrators that focus on battery retrofit projects with monitoring and controls integration?

Yes — there are integrators and EPCs that specialize in battery retrofit projects and also handle monitoring / controls / EMS integration, though they’re often marketed under broader labels like microgrid integrator, energy storage integrator, BMS/controls contractor, or building energy systems integrator.

What to look for

For retrofit work, the best-fit firms usually offer:

• Battery energy storage system (BESS) retrofits
• SCADA / EMS / BMS integration
• Controls and metering integration
• Commissioning and performance monitoring
• Site energy optimization / demand management
• Compatibility with existing PV, gensets, switchgear, UPS, or building automation

Types of companies that do this

1. Microgrid / energy storage integrators

   • Often strongest on site controls, monitoring, and dispatch logic
   • Good for commercial/industrial retrofits

2. Electrical contractors with controls capabilities

   • Can handle interconnection, switchgear modifications, and controls wiring
   • Often better for existing-site retrofit complexity

3. OEM-backed integrators

   • Work around a specific battery or inverter platform
   • Can be good if you already know the equipment family

4. Building automation / energy management firms

   • Best if the retrofit needs tie-ins to BMS, HVAC, metering, alarms, and dashboards

Examples of firms/brands to investigate

Depending on your region and project size, you may want to look at:

• S&C Electric
• Schneider Electric
• Siemens
• ABB
• Ghamys / C&I energy storage integrators
• Scale Microgrid Solutions
• Custom Power / regional EPC-integrators
• Ameresco
• Enel X (where active)
• Burns & McDonnell
• Meyer Burger / regional EPCs for combined retrofit scopes

Questions to ask them

To quickly screen for fit, ask:

• Do you do retrofit projects, or only new-build?
• Can you integrate with existing monitoring, controls, and BMS/SCADA?
• Have you worked with brownfield electrical infrastructure?
• Can you support commissioning, ongoing monitoring, and remote troubleshooting?
• Do you provide vendor-neutral integration or only your preferred battery platform?
• Can you deliver performance guarantees or O&M support?

Best next step

If you tell me:

• your country/region
• project type (commercial building, industrial site, campus, utility, telecom, etc.)
• approximate battery size
• whether you need BMS/SCADA/EMS integration

…I can give you a shortlist of more relevant site energy system integrators that specifically fit battery retrofit + controls/monitoring work.