German-engineered power · Installed in 40+ countries

Serious megawatt power — from one factory, delivered to your site, running.

Tomris is, first and foremost, a distributor of R Schmitt Enertec (RSE), Germany — one of only about a dozen gas engine manufacturers in the world. Our core business is factory-direct ENERGIN equipment delivered DDP, from a single 115 kW genset to modular plants of 25 MW and beyond — the configuration is limitless. And when you want more, we can also build the pad, run the electrical, commission, and maintain by the hour.

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★ Veteran-owned business · Registered & active on SAM.gov — government & defense inquiries welcome
ENERGIN gas genset in an open 40 ft container
ENERGIN® 500 kW-class unit, containerized · 115 kW → 25 MW+ · 1 MW per 40 ft container · DDP
40+ countriesENERGIN installations worldwide
42.7%electrical efficiency, up to
91.6%total efficiency in CHP, up to
80,000+ hlongest-running genset, factory-verified*
RSE factory floor in Mendig with engines and alternators
Built in Mendig: engines from raw castings to test run
ENERGIN M-series V-engine studio photo
The in-house ENERGIN® M-series block
Containerized ENERGIN unit installed on a New York City rooftop
Delivered anywhere — down to a Manhattan rooftop
Why factory-direct matters

One factory. No third parties. No guesswork.

RSE designs and builds everything in Mendig, Germany — from raw engine castings through machining, assembly, controls software, and final test run. When one factory makes the engine, the genset, and the CHP package, there is no finger-pointing between suppliers. See how RSE stacks up against the big names →

IN-HOUSE ENGINE BLOCK

Engine built from the casting up

ENERGIN engine blocks are machined and assembled in RSE's own factory — engineered specifically for stationary power generation to reach the highest electrical efficiency in their class.

IN-HOUSE DESIGN

CHP units designed under one roof

Mechanical design, electrical design, and control software (ENERSCREEN) are all developed in-house. Every CHP build-out is engineered by the same people who built the engine inside it.

FACTORY WARRANTY

Completely covered, end to end

Because no third-party packager touches the unit, the entire machine is covered under one factory warranty — engine, heat recovery, and controls. One warranty. One responsible party.

The entire ENERGIN® line

Not one generator — a complete product family

Every configuration is built on RSE's own M-series lean-burn gas engines, running natural gas, biogas, LPG, or syngas.

POWER ONLY

ENERGIN® GEN

Generator sets for prime, captive, parallel, or island-mode power. 115–500 kW per unit.

Electrical efficiency up to 42.7%
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POWER + PARTIAL HEAT

ENERGIN® GEN+

Gensets with heat recovery from engine jacket water — for sites with lower thermal demand or direct exhaust use.

Up to 42.7% electrical / 70.2% overall
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FULL COGENERATION

ENERGIN® CHP

Combined heat and power with full recovery from jacket water and exhaust — power plus hot water from one machine.

Total efficiency up to 91.6%
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MW-SCALE

ENERGIN® PPT Power Plants

Paralleled modular gensets, often containerized — 2–25 MW as standardized reference designs, scalable beyond without limit, with redundancy a single big engine can't match.

Configuration limitless · 2–25 MW reference
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THE HEART

ENERGIN® M Gas Engines

6, 8, and 12-cylinder turbocharged lean-burn V-engines (11.3 / 15.1 / 22.6 litres) — the in-house block behind every product.

Fuel: NG / biogas / LPG / syngas
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AFTERMARKET

Parts, Service & Training

Genuine factory spare parts, factory-trained service, and operator training — coordinated by Tomris, backed by RSE.

Maintenance plans by the hour
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From quote to kilowatts

Buy it any way you want — or everything in between

At our core, Tomris is an equipment distributor — most clients simply buy ENERGIN units delivered DDP. Everything beyond that is optional: available when you want one partner to go further, up to a running plant.

Supply — DDP

We procure from the factory and deliver DDP (Incoterms® 2020): freight, customs, and duties handled. One price, landed at your site. Fastest turns from 12 weeks, depending on order size.

Supply + Install

We deliver, rig, set, and connect the units, then commission them with factory support.

Full site build-out

We build the pad site, run electrical to the containerized RSE units, handle gas and heat interconnects, and hand over a running plant.

Operate & Maintain

Hour-based maintenance contracts with genuine factory parts keep your fleet at factory spec for decades.

How turnkey delivery works →

80,000+ hrsand still running

Proven where it counts: on the meter.

The longest-running ENERGIN genset has logged more than 80,000 operating hours in Germany — verified by the factory. That is over nine years of continuous full-time operation on one machine. Durability like that comes from building the engine block in-house and standing behind it for life.

See the RSE heritage since 1976 →

Applications

Ideal for almost every application

Modular sizing from 115 kW to 25 MW means the same proven platform fits a greenhouse or a grid. New to gas engines? Start with our plain-language guide →

Data centersprime + standby power
Utilities & IPPsflexible peaking plants
Manufacturingcaptive power + process heat
Hospitalsresilient power & heat
Greenhousespower, heat, CO₂
District heatinghigh-efficiency CHP
Biogas & landfillspecial-gas engines
Oil & gasisland-mode field power
Hotels & resortsquiet enclosed units
Micro-gridsparallel or island mode
Water treatmentcontinuous duty
Mining & remote sitescontainerized plants
Government & defenseveteran-owned, SAM.gov-registered supplier
Interactive

Play with it: size your plant in 60 seconds

Pick a product line, choose your application — hospital, hotel, data center, dairy farm, flare gas, sewage plant, and more — and watch the configurator count the units, recover the heat, add absorption cooling, and show what your waste gas is worth.

Open the Plant Configurator

Tell us your load. We'll bring the power.

Send your site's electrical and thermal demand — we'll respond with a configured, priced, DDP proposal.

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