You can buy the engine on its own as a long block, to repower or rebuild something you already run, or already built into a generator package with its alternator and controls. Every unit is sold from Red Deer and quoted on its own.
The first decision is whether you need an engine or a power source. If you already own the frame, the alternator and the panel, and only the engine is finished, a long block may be all you need. If the site needs electricity and nothing is there yet, you want the engine already married to everything else.
This is the engine without a generator around it, bought to repower equipment you already have or to replace a block that is past rebuilding. If you are looking at a natural gas engine for sale to repower with, check the fit against the engine coming out: displacement, cylinder layout and mounting. What ships with a long block varies from one unit to the next, so ask what is included with the unit before you plan the install.
Here the engine is already built into a generator set, coupled to its alternator and run by its own controls, so there is no engine installation for you to plan. The NPI Series is our own design, built in Red Deer. Other packages in the list come with the engine the listing names.
The NPI Series →These are the industrial natural gas engines for sale without a generator attached, read from the inventory each time this page loads, so a unit that sells drops off without anyone editing the page. If you came here for a Cummins engine for sale, the New Cummins 5.9 L natural gas long block listing gives its make, displacement, cylinder layout and horsepower.
If you search by engine model and not by kilowatts, this table is for you. Each row is a complete generator set for sale whose listing names the engine it carries. Gas and dual-fuel sets come first, then diesel. Output and fuel are as each listing states them, and the full specs are on the unit's own page.
Searching for a Cummins 855? The 200 kW Cummins 855 TA natural gas package carries one. Ask us to read the full model off its data plate.
If you are looking for diesel engines for sale, none are listed on their own. The diesel engines we sell come inside complete generator sets.
The rest of what we sell is under Equipment for sale. For whole sets sorted by fuel and not by engine, see Natural gas generators for sale and Diesel generators for sale.
A listing title is shorthand. The plate on the engine carries the full model and serial, and those are what parts suppliers and your mechanic will ask for. Ask us to read it to you before you commit.
Where a listing gives the hours or the date of the last overhaul, that tells you more than the build year does. Where it gives neither, ask what is known, and get the answer on the quote.
A spark-ignited engine set up for pipeline gas may need work on its fuel system before it runs well on propane or wet field gas. The fuel line on each listing says what the unit was set up for, so compare it with your supply.
For a complete package, starting it and letting it idle proves very little. Ask for time on a load bank at the load you plan to carry, and watch voltage, frequency and temperature while it holds.

A long block is the engine core on its own, without the generator end, the controls or the base that turn it into a power source. You buy one to repower or rebuild something you already own. A complete package is the engine already built into a generator set with its alternator and controls, ready to be placed on a site and connected. Which one fits depends on whether the rest of the machine already exists.
The listing describes it as a new Cummins 5.9 L natural gas long block: an inline-six rated at 99 hp, with the note that complete long block assemblies are available. Its price is given on request, not published. Anyone looking at a natural gas engine for sale to repower with should ask for the parts list that goes with this unit before ordering, so the install can be planned around what actually arrives.
The listing describes it as a Cummins 855 TA natural gas engine and gives nothing more specific. We would rather not guess past that. Ask, and we will read the full model off the data plate on the engine.
No diesel engines are listed on their own. The diesel engines we sell come inside complete generator sets, and those are on the Diesel generators for sale page, with the engine named on the listings that give it.
No. Every generator we list carries its own engine. If you were considering a PTO unit, send the load you need to power and we will say which set in the list fits it, or that none does.
Each unit is quoted on its own. Condition, hours, configuration and what is included all change the figure, so a single published number would be wrong for most of them. Ask about a specific listing and you will get a quote for that unit.
If you are repowering, tell us the make, model and fuel of the engine coming out, and what it drives. If you are buying a whole set, name the listing. Either way, use the contact form or call (403) 887-4567, and you will get a straight answer on whether something here fits.