A barge passing through Saint John’s Reversing Falls does not normally tell us much about the global pulp market.

This one does.

On September 13, the first barge carrying major equipment for Irving Pulp & Paper’s Project NextGen passed through the Reversing Falls and reached Lee Cove beside the company’s west Saint John mill, where Irving Equipment began unloading the components.

The shipment is part of the C$1.5 billion modernization that will replace major 1970s-era equipment with a new recovery boiler, steam turbine and generator.

Construction began in 2025 and is expected to be completed in 2028.

That makes the barge an obvious construction milestone.

But the more important question is:

Why does a pulp mill need a project this large just to increase production?

The answer sits at the centre of the kraft process.

Irving is not simply adding another pulp machine.

It is rebuilding the chemical-recovery and energy system that determines how much pulp the rest of the mill can sustainably produce.

That makes Project NextGen less like a conventional capacity expansion and more like the removal of a decades-old industrial bottleneck.

The recovery boiler can become the ceiling on the entire mill

In a kraft pulp mill, wood chips are cooked with chemicals to separate cellulose fibres from lignin.

That process creates black liquor containing:

spent cooking chemicals,

dissolved lignin,

and other organic material removed from the wood.

The mill cannot simply discard that stream.

Black liquor has to be concentrated and processed through the recovery system.

The recovery boiler performs two jobs simultaneously.

It recovers inorganic pulping chemicals so they can be returned to the kraft cycle.

And it burns the organic fraction of the black liquor to generate heat and steam.

That means pulp production and recovery capacity are inseparable.

Produce more pulp and the mill generates more black liquor.

If the recovery boiler cannot process that additional liquor, increasing upstream pulp capacity does not solve the problem.

The recovery boiler becomes the bottleneck.

That is why Irving describes the new unit as the heart of NextGen.

Its current project site says the larger recovery boiler will allow pulp production to increase by approximately 66%.

The Canada Infrastructure Bank uses a somewhat higher description, saying the modernization will increase production by more than 70%.

The percentages differ, but the industrial story is the same.

The project is unlocking capacity that could not be fully exploited while the mill remained constrained by older recovery technology.

Irving has already upgraded much of the mill around that bottleneck

This is what makes NextGen easier to understand.

It is not Irving’s first major investment in Saint John.

Over the previous decade, the company has already spent heavily on other process areas.

Previous projects included:

a modern continuous digester,

new chip handling,

a new pulp dryer,

environmental treatment infrastructure,

and, more recently, a C$110 million woodyard modernization using an automated stacker-reclaimer system.

Those projects improved individual parts of the fibre-to-pulp system.

But eventually another constraint becomes dominant.

Irving itself has said that although leading pulp mills around the world continued getting larger and more efficient, Saint John’s production position had gradually fallen from the top quarter of global producers toward the lower end.

The CIB described NextGen as the transformation intended to move the mill back toward the top tier.

That is a useful way to look at the investment.

The new recovery boiler is not an isolated piece of equipment.

It is what allows earlier investments in:

digestion,

drying,

wood handling,

and process efficiency

to operate at a substantially higher overall mill output.

That is why the first equipment delivery matters

Large industrial projects spend years appearing almost invisible.

Engineering.

Permitting.

Financing.

Procurement.

Civil preparation.

Foundations.

Then major process equipment begins arriving.

At that point, the risk profile changes.

Project NextGen received one of its most important financial commitments in September 2025, when the Canada Infrastructure Bank reached financial close on a C$660 million loan.

By spring 2026, construction was visibly progressing across the recovery-boiler, turbine-generator and evaporator areas.

Now major components are physically reaching the site.

J.D. Irving said the first cargo travelled by ship to the Port of Saint John, was transferred to a barge and then moved upriver through the Reversing Falls to the mill. Passage through the Falls has to be timed around slack tide, with suitable windows occurring only twice daily.

That is why the September 13 movement required trial runs and coordination among:

marine crews,

crane operators,

project planners,

Atlantic Towing,

Harbour Development,

and Irving Equipment.

The barge is therefore a useful signal.

The project is no longer mainly a financial promise.

It is becoming installed steel.

Brownfield construction creates a logistics problem of its own

There is another reason marine delivery matters.

This is not a greenfield mill built on an empty industrial site.

Irving is installing massive equipment inside a pulp mill that has operated on Saint John’s west side for generations.

Existing:

buildings,

roads,

process lines,

pipe racks,

utilities,

employees,

and operating equipment

all constrain how new components can move.

Oversized equipment may be too large or too difficult to move efficiently through normal road networks.

Marine access creates another route.

But Saint John’s waterfront introduces its own constraint—the Reversing Falls.

That means transportation itself becomes part of project engineering.

The company cannot simply order a component and decide later how to move it onto site.

Dimensions, lifting points, vessel handling, barge loading, tides and crane capacity have to be considered much earlier.

J.D. Irving has said an LR 1700 crawler crane is already supporting major lifts across the recovery-boiler, turbine-generator and evaporator buildings.

This is the less visible reality of modernizing old pulp mills.

Sometimes the engineering challenge is not designing the new equipment.

It is physically inserting twenty-first-century equipment into a twentieth-century mill.

The energy system is changing at the same time

The new recovery boiler is not only about pulp tonnage.

It is also the centrepiece of Irving’s energy strategy.

The CIB says the new recovery boiler, steam turbine and generator will produce up to 145 MW of renewable electricity.

Approximately 50 MW is expected to be used by the mill, with surplus electricity exported to the New Brunswick grid under an agreement with NB Power.

The project will also allow Irving to decommission an oil-fired boiler and eliminate heavy fuel oil from the mill’s energy mix.

That means NextGen is simultaneously:

a pulp-capacity project,

a chemical-recovery project,

and a power-generation project.

This is an important characteristic of kraft pulp economics.

Black liquor is not merely waste requiring disposal.

It contains considerable biogenic energy.

A modern recovery system turns that stream into steam and electricity while recovering the chemicals needed for the next pulping cycle.

At sufficient scale, the pulp mill becomes an energy producer as well as an energy consumer.

Energy self-sufficiency changes the cost structure

For a commodity pulp producer, purchased energy matters.

The mill competes internationally.

A customer buying NBSK does not pay more simply because the producer has an inefficient steam system.

Energy cost therefore feeds directly into competitiveness.

Generating more electricity internally can reduce exposure to purchased-power costs.

More importantly, if the mill consistently produces surplus electricity, energy becomes a second revenue or value stream attached to pulp production.

The economics become particularly interesting because pulp output and renewable-energy generation rise through the same recovery system.

More wood processed means more black liquor.

More black liquor provides more fuel for recovery.

The larger boiler produces more steam.

The turbine converts that steam into electricity.

The investment therefore does not treat decarbonization and productivity as separate projects.

They are linked through process integration.

But the 50% emissions claim needs one important qualification

Both Irving and the CIB say Project NextGen will reduce greenhouse-gas emissions per tonne of kraft pulp by 50%.

The words “per tonne” matter.

This is an emissions-intensity target.

It does not mean total mill greenhouse-gas emissions automatically fall by 50%.

The mill is simultaneously planning a major production increase.

So two things can happen together:

emissions per tonne decline sharply,

while total production rises substantially.

The CIB separately lists an expected project impact of about 379,000 tonnes of CO2e avoided annually, based on its project assessment.

Those are different metrics.

For industrial decarbonization, both matter.

Intensity shows how much cleaner each tonne becomes.

Absolute emissions determine the overall atmospheric impact.

They should not be conflated.

The bigger operational challenge comes after the boiler is built

Increasing recovery capacity removes one bottleneck.

It creates pressure somewhere else.

The most obvious next question is fibre.

A mill producing roughly two-thirds more pulp needs substantially more:

wood chips,

pulpwood,

chemicals,

transport,

storage,

and outbound logistics.

Irving’s original 2024 Environmental Impact Assessment modeled this very directly.

Under the production scenario examined at the time, the project could require an additional 480,000 tonnes of wood chips per year.

The EIA estimated roughly:

370,000 tonnes arriving by truck,

and

110,000 tonnes arriving by rail.

It also projected substantial increases in outbound kraft-pulp shipments.

Those figures came from the earlier EIA scenario, which modeled an 80% production increase, while Irving’s current public project site now uses approximately 66%.

So they should not be presented as the final operating forecast.

But they illustrate the scale of the supply-chain challenge.

The permanent logistics change after NextGen could be much larger than the one-time barge deliveries attracting attention today.

The real NextGen logistics story may be wood chips, not boiler steel

This is an important distinction.

Moving a large boiler component through the Reversing Falls is spectacular.

It happens a limited number of times during construction.

Moving hundreds of thousands of additional tonnes of fibre is repetitive.

It happens every year.

If NextGen succeeds in raising output as planned, Saint John will require a larger and more reliable fibre flow across:

forests,

sawmills,

chip producers,

roads,

and rail.

That is why Irving repeatedly describes the pulp mill as an anchor for New Brunswick’s wider forest-products chain.

Sawmills produce lumber.

They also generate wood chips and bark.

Forestry operations generate lower-grade material that may not be suitable for solid-wood products.

A large pulp mill creates a market for those residual and lower-value fibre streams.

Irving’s own sustainability reporting says the mill sits at the centre of its forest supply chain by converting low-value wood chips, bark and pulpwood into higher-value kraft pulp.

Increasing pulp capacity therefore changes economics well beyond the mill gate.

This helps explain the projected 600 supply-chain jobs

The CIB says NextGen is expected to support more than 600 additional jobs across the provincial forestry supply chain once the expanded mill is operating.

That figure is based on an economic-impact assessment supplied by Irving, so it should be treated as a project projection rather than an already realized employment count.

But the mechanism behind it makes sense.

More pulp requires more fibre.

More fibre means more activity in:

harvesting,

trucking,

rail,

chip production,

silviculture,

equipment maintenance,

and related services.

The project therefore does not simply add capacity inside Saint John.

It increases the amount of forest material the regional supply chain needs to move.

This could strengthen demand for low-grade fibre.

It also means the project ultimately depends on the forest system being able to support that larger flow economically and sustainably.

A larger mill needs more than a larger forest supply

Another downstream issue is market demand.

Irving produces both Northern Bleached Softwood Kraft and Northern Bleached Hardwood Kraft, with a particular emphasis on fibres used in premium tissue products.

Softwood kraft pulp occupies a different market position from the large volumes of eucalyptus hardwood pulp being added in South America.

Long softwood fibres are valued for reinforcement.

In tissue, relatively small proportions of NBSK can provide strength while hardwood fibres contribute softness and formation.

That gives high-quality NBSK an important role even when hardwood pulp dominates the furnish by volume.

But the market is still cyclical.

A mill becoming capable of producing much more pulp also has to sell that pulp profitably.

Scale improves competitiveness.

It does not eliminate:

pulp-price cycles,

exchange-rate movements,

freight,

customer destocking,

or competition from other NBSK producers.

The business case therefore depends not simply on making more tonnes.

It depends on making those tonnes at a cost position capable of surviving weak markets.

This is why the recovery boiler is really a competitiveness investment

Irving’s own description of the project repeatedly returns to global competitiveness.

The Saint John mill is old.

That does not mean it has to be obsolete.

Many of the world’s competitive pulp mills are brownfield sites that have been rebuilt repeatedly.

The question is whether the installed process technology allows the mill to approach modern benchmarks for:

scale,

energy,

chemical recovery,

reliability,

and operating cost.

The CIB says NextGen replaces 1970s-era technology with current technology specifically to improve productivity and preserve competitiveness.

That is more revealing than the headline investment amount.

C$1.5 billion is not being spent simply because the existing recovery boiler is old.

It is being spent because keeping that bottleneck would limit the commercial value of the rest of the mill.

NextGen is actually the latest phase of a much longer rebuild

This also prevents the project from being mistaken for a sudden expansion decision.

Irving has been modernizing the Saint John mill for more than a decade.

Earlier phases addressed:

chip handling,

continuous cooking,

pulp drying,

environmental treatment,

and woodyard infrastructure.

NextGen is effectively the next major step in that sequence.

The CIB describes it as establishing a foundation for approximately the next 40 years of operation.

That is how major kraft mills evolve.

It is rarely economical to replace an entire integrated site at once.

Instead, the owner identifies the next major constraint.

Replace it.

Run the system harder.

Then find the next one.

Eventually, the mill may look almost completely different from the facility that originally occupied the same location.

The public financing also deserves attention

The C$660 million CIB loan is substantial—roughly 44% of the stated C$1.5 billion project cost.

The CIB says its financing helps bridge lending gaps for a project combining industrial modernization with clean-power generation.

This creates an interesting industrial-policy model.

The government-backed infrastructure bank is not buying the pulp mill.

It is financing a private industrial project partly because the project also produces public infrastructure benefits:

renewable power,

lower emissions,

regional employment,

and electricity supplied to the grid.

That differs from a conventional mill subsidy.

The CIB provides repayable financing.

But the financing still affects project economics by supporting capital deployment that might otherwise be harder or more expensive to fund commercially.

For energy-intensive industries, this type of blended infrastructure logic may become increasingly important.

The project is trying to solve productivity and decarbonization with the same asset

This may ultimately be the most interesting aspect of NextGen.

Industrial decarbonization is often discussed as though environmental investments impose a cost on production.

NextGen attempts the opposite.

The recovery boiler improves:

chemical recovery,

steam generation,

electricity production,

and pulp capacity

at the same time.

Removing the oil-fired boiler reduces fossil-fuel use.

The new turbine monetizes more process steam.

The larger recovery system allows higher pulp throughput.

That is an attractive decarbonization model because environmental performance and production economics reinforce each other.

Not every emissions reduction project has that characteristic.

Some require spending capital purely to reduce pollution.

A recovery-boiler modernization can potentially pay through:

higher output,

lower fossil-fuel consumption,

greater internal power generation,

and improved reliability.

That helps explain why the equipment sits at the centre of a C$1.5 billion strategy.

Reliability may matter almost as much as capacity

There is another benefit that receives less attention.

A 1970s-era recovery boiler is not simply smaller than a modern one.

It also carries decades of:

maintenance,

pressure-part management,

inspection,

controls upgrades,

and reliability risk.

Recovery boilers are among the most critical assets in a kraft mill.

An extended recovery-boiler outage can constrain or stop pulp production because black liquor cannot simply accumulate indefinitely.

That makes reliability commercially significant.

A modern recovery boiler with contemporary automation, materials and control systems can reduce one source of long-term operating risk.

Irving has already highlighted the amount of control-system work involved: one engineering co-op project alone developed around 900 pages of recovery-boiler control documentation for NextGen.

That small detail illustrates the real complexity behind the equipment.

The boiler is not just steel and tubes.

It is an integrated chemical, energy and automation system.

The first barge therefore marks the beginning of the difficult part

Financing C$1.5 billion is difficult.

Permitting a major mill project is difficult.

Engineering a new recovery island is difficult.

But execution is where all of those plans have to work simultaneously.

Components have to arrive in sequence.

Cranes have to be available.

Structures have to be completed.

Existing mill operations have to continue safely around construction.

Tie-ins have to occur during carefully planned outages.

Automation has to integrate with existing systems.

Operators have to be trained.

Eventually, the old and new process systems have to change over without compromising production or safety.

A successful first barge does not prove the project is finished.

It proves the logistics plan for one of those critical steps works.

That matters.

Watch the commissioning, not just the construction

The most useful milestones from here will not necessarily be the most photogenic.

More equipment deliveries will come.

Buildings will rise.

The recovery boiler will become visually dominant on the site.

But the decisive milestones will eventually involve:

mechanical completion,

chemical cleaning,

boiler firing,

steam production,

turbine synchronization,

chemical-recovery stabilization,

and the ramp-up of pulp output.

That is when Irving will begin testing whether the project delivers what the financial model promises.

The industry’s important questions will be:

How quickly does the new recovery system reach stable operation?

How much additional pulp can the mill produce sustainably?

What is the new specific energy consumption?

How much purchased fossil energy disappears?

How much electricity is exported?

What happens to wood-chip demand?

And does the new scale materially improve Saint John’s cost position?

Those numbers will matter far more than the number of barges required to deliver the equipment.

One official number still needs watching

There is also a small but important reporting inconsistency.

Irving’s dedicated NextGen site currently says the larger recovery boiler will increase production by approximately 66%.

The September 2025 CIB financing announcement says output will increase by more than 70%.

And the original 2024 EIA analyzed a scenario involving an increase of up to 80%.

These figures likely reflect different project stages, assumptions or measurement bases.

They should not be mixed into one precise capacity claim without clarification from Irving.

For current reporting, the company’s dedicated project site provides the clearest conservative figure:

approximately 66%.

The larger lesson is unchanged.

This is a very substantial capacity increase.

The barge is visible. The transformation behind it is much larger.

Watching a heavy component pass through the Reversing Falls makes Project NextGen tangible.

But the shipment itself is not what changes Irving’s competitive position.

The new recovery system does.

It removes an important production constraint.

It allows more energy to be recovered from black liquor.

It supports the elimination of heavy fuel oil.

It increases renewable electricity production.

And it gives the rest of Irving’s previous mill investments room to operate at a larger scale.

Then another set of constraints emerges:

fibre supply,

transport,

pulp markets,

and mill ramp-up.

That is what makes this project worth watching.

Project NextGen is not simply replacing an old boiler.

It is attempting to rebalance the entire economics of the Saint John pulp mill.

The first barge means the most important pieces of that new system are now arriving.

The real test comes when they start working together.

Last Updated on 18/09/2026 by Jota Machinery