Carbon Management
Two CO₂ Streams: Why Gas Treatment and Power Generation Need Separate Carbon Strategies
When natural gas is developed to supply power, two quite different CO₂ streams appear, and treating them as one leads to poor decisions.
Upstream: CO₂ Already in the Gas
Many reservoirs produce gas containing CO₂, often with H₂S. It must be removed to meet fuel or pipeline specification, and that happens in gas-treatment plant, typically with chemical solvents, membranes or hybrids. It does not happen during drilling. The separated stream is relatively concentrated, which makes conditioning, compression and storage comparatively straightforward where suitable geology and approvals exist.
Downstream: CO₂ From Combustion
Burning the treated gas creates new CO₂, diluted in flue gas with nitrogen and excess air. Capturing it is a post-combustion problem with larger equipment and a higher energy penalty per tonne. Removing upstream CO₂ does nothing to reduce it.
Why It Matters
A credible carbon strategy for gas-fired Data Centre power accounts for both streams separately, states what is captured and what is not, and evaluates options such as higher-efficiency generation or fuel cells, whose concentrated exhaust may simplify capture.
Fuel Cells
Reading SOFC Performance Claims: Cell, System and CHP Efficiency
Solid oxide fuel cell performance is often quoted with numbers that measure different things. Three distinctions resolve most confusion.
Cell Performance
Power density, open-circuit voltage and area-specific resistance are measured on small cells under controlled laboratory conditions. They indicate materials quality and are essential for development, but they are not system efficiency and cannot be scaled directly to a power plant.
Electrical Efficiency
System electrical efficiency is net electricity delivered divided by fuel energy, after blowers, fuel processing, power conversion and other balance-of-plant losses. Commercial systems are commonly reported around 50–65% on a lower-heating-value basis. The heating-value basis should always be stated, because a higher-heating-value figure for the same unit is lower.
Combined Heat and Power
Adding useful recovered heat gives a higher combined figure, but it is only meaningful where the site genuinely uses that heat.
Architecture Matters Too
Electrolyte-supported and anode-supported cells differ in structure and operating temperature. Results from one should not be read across to the other.
Data Centres
Time-to-Power: How Onsite Generation Is Reshaping Data Centre Planning
For a growing share of Data Centre developments, the critical path no longer runs through construction. It runs through power.
The Planning Shift
Where utility connections take years, developers are evaluating onsite generation as bridging or prime power. Market research from Rystad Energy projects significant fuel cell demand from Data Centres through 2030, and gas turbines and reciprocating engines are being considered alongside them.
Decisions That Interact
Onsite power pulls new questions into the programme: firm gas supply, emissions permitting, redundancy architecture, load-following with batteries, and long-lead equipment for switchgear, transformers and generation. Each affects the others, and each affects the schedule.
Planning It Together
The developments that move fastest treat power strategy, procurement and the master schedule as one plan from day one, with a transparent model that shows how a change in one assumption moves cost, carbon and Ready for Service dates.
Mining
Brownfield Mine Restarts: Planning Waste Before It Becomes the Critical Path
Restarting a former producer can be faster than building a new mine, but it brings a waste management problem that new projects rarely face: legacy and new waste streams on the same site, under the same permits, while production ramps up.
Waste Is Coupled to Production
In underground mines using paste backfill, tailings become a construction material. Stope sequencing waits for backfill, backfill depends on mill throughput, and any tailings not returned underground must fit within surface storage capacity. A delay in one stream quickly becomes a delay in mining.
Legacy Conditions Matter
Historical tailings facilities, existing waste rock piles and older water infrastructure often need upgrades before they can support renewed operations. Those works have to be scheduled around an operating mill.
Plan It as a System
The most effective approach treats waste rock, tailings, contact water and site waste as one planned system: a single inventory, clear routes and destinations, integration with the mine schedule, and monitoring that keeps the plan current. It also lays the groundwork for progressive reclamation and closure.