EnergyCAP vs OpenEMS
EnergyCAP
energycap.comOpenEMS
openems.ioSide by side
| Figure | EnergyCAP | OpenEMS |
|---|---|---|
| Price from | $333.33/mo | — |
| Free plan | — | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 9 | 0 |
| Spec score · Energy Management Software | 8.6 (#1) | 7.1 (#15) |
| Integrations | EnergyCAP connects with ENERGY STAR Portfolio Manager bidirectionally and can feed Tableau, Power BI and other BI tools. | The OpenEMS Ready list includes integrations across energy storage, batteries, solar and battery inverters, EV charging stations, meters, tariffs, and data services. |
| Security | EnergyCAP states it has SOC 2 Type II certification, FedRAMP Low-Impact SaaS authorization, TLS 1.2-or-higher encryption, Azure hosting, encrypted backups and penetration testing. | The documented Backend-to-Backend API supports BasicAuth when a connection is opened. |
| Support | Customers receive email ticket support, some receive phone support, and EnergyCAP offers an AI help agent, Academy training, and a free Eco Champions Community. | The project invites users to get in touch through the OpenEMS Community forum and says it is glad to support third parties taking their first steps. |
Plans
EnergyCAP
- Express$4,000 a year
- EnergyCAP (Capterra starting price)$5,000 a year
- Enterprise$13,000 a year
- Bill CapturePriced on request
- EmissionsPriced on request
- EnergyCAP Bill PayPriced on request
- EnergyCAP Premium Complete PackagePriced on request
- Interval DataPriced on request
- Utility ManagementPriced on request
In their own words
EnergyCAP
EnergyCAP is a cloud-based utility bill and energy management platform for organizations with multiple buildings and utilities. It tracks electricity, natural gas, water, sewer, and other commodities from bills and meters, then provides analytics, reporting, and auditing. Automated auditing checks for duplicate or overlapping bills, missing bills, and unusual use, cost, or demand. The platform benchmarks building performance, supports consumption trend analysis, and allocates costs to departments, tenants, cost centers, or buildings using formulas such as square footage, occupants, percentages, or metered usage. Watts AI provides insights from utility data, while Watts AI Chat lets users explore data conversationally and generate reports. EnergyCAP integrates with ENERGY STAR Portfolio Manager, lists interfaces such as Desigo CC and an Analytics REST API, and offers formatted accounting exports compatible with several ERP systems. It serves organizations including universities, healthcare systems, governments, and large enterprises with multiple locations. Pricing is on request. EnergyCAP states that it maintains SOC 2 Type II compliance, and the service cannot be hosted on customer-owned servers.
OpenEMS
OpenEMS is a free, modular open-source platform for monitoring, controlling, and integrating energy storage, renewable sources, and related devices and services. Its stack combines OpenEMS Edge for on-site device communication and control, OpenEMS UI for browser and smartphone access, and OpenEMS Backend for connecting Edge systems over the internet for aggregation, monitoring, and control. The architecture supports fast PLC-like control and reusable device-independent algorithms. Integrations cover batteries, solar and battery inverters, EV chargers, meters, tariffs, and data services, using interfaces such as MQTT, Modbus/TCP, Modbus/RTU, InfluxDB, M-Bus, 1-Wire, JSON/REST, and JSON/Websocket. Edge and Backend use Eclipse Public License 2.0; UI uses GNU Affero General Public License 3. Production deployment guidance covers Debian, Ubuntu, or Docker, and Java 21 is required. Source is available online and on GitHub, with monthly releases described. The getting-started setup is intended for testing, not production.