Comparison

Energy Optima vs HOMER Pro

Both tools optimize hybrid systems. HOMER Pro is the long-standing standard for microgrid feasibility; Energy Optima is built for utility and C&I BESS projects that need bankable PV yield and 25-year economics. Here is an honest split.

What HOMER Pro does genuinely well

HOMER Pro (originally from NREL, now maintained by UL Solutions) is excellent at one specific job: searching across a large space of generation and storage configurations to find the least-cost mix for a given load. For remote microgrids, island systems and community electrification — where fuel logistics and generator sizing dominate — it is mature and well understood by lenders and donors.

Configuration search over a wide space. It compares thousands of combinations of PV, wind, diesel, battery and grid, then ranks them on levelized cost.
Robust sensitivity analysis. Fuel price, component cost and resource variability sweeps are first-class citizens.
Long track record in microgrid feasibility. Reviewers and development banks know its outputs.

Where HOMER Pro thins out for BESS work

HOMER's simplifications are deliberate — they keep the search fast. They also mean it is not designed to produce a bankable package for a grid-connected BESS.

Battery degradation is a single linear parameter. No separation of calendar versus cycle ageing, and no interpolation across C-rate. For LFP systems running one or two cycles a day over 20 years, that materially misstates capacity retention and replacement timing.
PV modelling is coarse. No 3D near-shading, no MPPT-level string sizing, no detailed inverter clipping or 10-category loss waterfall.
Component library is limited. Custom components mean manual parameter entry rather than selection from manufacturer datasheets with degradation tables.

What Energy Optima does

Degradation from real cell data. SOH and RTE are interpolated in three dimensions (year × C-rate × cycles per day) from manufacturer degradation tables.
Manufacturer-grade PV model. Multi-array design with MPPT string sizing and a 10-category IEC 61724 loss waterfall.
LP-optimized capacity sizing against an 8760-hour load profile, rather than a configuration search.
25-year financial projections on paid tiers — NPV, IRR, LCOE, payback and battery augmentation planning (inflation and replacement included). Payback analysis is available on the free tier.

Where HOMER Pro beats us

Being straight with you: HOMER Pro has a decade of institutional familiarity in microgrid feasibility, a broader built-in configuration search, and outputs that many development-finance reviewers already accept. If your project is an off-grid village microgrid being screened for a grant, HOMER is a defensible choice and swapping tools late in that process earns you nothing.

Feature comparison

Capability	Energy Optima	HOMER Pro
Optimization method	LP sizing against 8760-h load profile	Search across configuration space + sensitivity
Battery degradation	3D interpolation: year × C-rate × cycles/day	Single linear fade parameter
PV modelling depth	Multi-array, MPPT string sizing, 10-category loss waterfall	Simplified; no 3D shading or string sizing
Component database	Manufacturer datasheets with degradation tables	Limited default library; manual entry for custom
Dispatch	Rule-based, economic and predictive MPC dispatch	LP dispatch within the configuration search
Financial horizon	Up to 25–50 years, with augmentation planning	Project-level NPV and LCOE
Delivery	Web platform, PDF/Excel/Word export, API (Team+)	Desktop application
Best fit	Grid-connected BESS, C&I hybrid, bankable packages	Off-grid microgrid feasibility

Assessment based on published documentation and each tool's documented modelling approach. Capability descriptions reflect the commercial tiers in which each feature ships — verify against current vendor documentation before specifying a tool for a project.

Which should you choose?

Choose HOMER Pro if…

Your project is an off-grid or island microgrid being screened for feasibility.
You need a broad built-in configuration search across many technologies.
The reviewer of your study already expects HOMER outputs.

Choose Energy Optima if…

You need degradation modelled from real cell data, not a single fade rate.
The project needs bankable PV yield (3D shading, string sizing, loss waterfall).
You are building a 25-year cashflow with NPV, IRR and augmentation timing.

Frequently asked

Is HOMER Pro free?

No. HOMER Pro is commercial software sold under a paid licence; HOMER Grid and HOMER Front are separate products aimed at grid-connected and front-of-meter storage respectively. Check UL Solutions' current pricing page for the exact tier that fits your use. Energy Optima has a permanent free tier in addition to paid plans.

Does HOMER Pro model battery degradation accurately?

It models degradation with a simplified linear relationship. That is adequate for rough configuration comparison, but it does not separate calendar ageing from cycle ageing, nor interpolate performance across C-rate — which matters for multi-decade BESS economics.

Can I use both tools?

Yes, and plenty of teams do. HOMER for early configuration screening, then Energy Optima for the detailed degradation, dispatch and finance work that goes into the report you hand to a lender.

What does the free Energy Optima plan include?

Unlimited projects — each up to 1 MW PV / 1 MWh storage — with Battery + PV + Grid topology, 1-year simulation, rule-based auto-design, payback analysis, and PDF export. No credit card required.

Try it on a real project

Unlimited projects — each up to 1 MW PV / 1 MWh storage — with Battery + PV + Grid topology, 1-year simulation, rule-based auto-design, payback analysis, and PDF export. No credit card required.

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