Denison Mines’ Phoenix ISR grid tie-in: execution and permitting notes for planners
Reviewed by Joe Ashwell

First reported on International Mining – News
30 Second Briefing
Grid power from SaskPower is now available at Denison Mines’ planned Phoenix in-situ recovery (ISR) uranium project in the Athabasca Basin after installation of a new 138 kV transmission line to site. The connection removes reliance on diesel generation for construction power, supporting the project’s low-carbon ISR design and simplifying permitting linked to emissions and noise. For mine planners, firm grid access at this stage reduces execution risk around wellfield drilling, freeze wall installation and long-term pumping and processing loads.
Technical Brief
- Connection to SaskPower allows permanent electrical infrastructure to be designed around stable grid voltage and frequency.
- Grid tie-in enables earlier deployment of high-power drilling rigs and freeze-plant compressors without temporary upgrades.
- Electrical supply security reduces contingency requirements for duplicate diesel gensets and on-site fuel storage capacity.
- Reduced on-site combustion simplifies mine ventilation design, particularly for construction headings and enclosed plant areas.
- Noise and vibration from large diesel units are largely eliminated, easing compliance with environmental approval conditions.
- Long-term pumping and processing equipment can be specified for continuous grid duty rather than cyclic diesel operation.
Our Take
With uranium also prominent in recent coverage of Sprott Physical Uranium Trust’s stockpiling and investor surveys on AI-driven power demand, Denison Mines’ Phoenix ISR project is advancing into a market where long-term nuclear fuel demand expectations are being reinforced rather than questioned.
Grid connection via SaskPower at the Phoenix site positions Denison Mines differently from ISR peers like Boss Energy’s Honeymoon project in South Australia, which has had to revisit its development plan, suggesting that secure, utility-scale power is becoming a key de-risking lever for ISR uranium developments.
Among the uranium-tagged pieces in our database, several focus on US and Australian assets, so Phoenix’s progress under a Canadian provincial utility framework gives operators a comparative case study in how established grid infrastructure and regulatory regimes can support low-carbon uranium projects.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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