Grid power is now the critical path.
AI-driven demand is outpacing transmission, interconnection, and equipment availability. Even utilities and OEMs are struggling to keep up. For data center developers and owners, this translates into:
- Interconnection delays and power uncertainty
- Long lead times for transformers, switchgear, and generation
- Increased schedule, capex, and reputational risk
Behind-the-meter power shifts control back to the owner.
Delivering fully islanded, on-site power generation is not a single equipment decision, but a pipeline-to-power system that must be reliable, financeable, and executable.
In general, however, Reciprocating engines generally offer lower upfront cost but materially higher long-term operating and maintenance burden due to unit count and system complexity. Gas turbines require more initial capital but deliver simpler plant architecture, lower lifecycle operating risk, and more predictable long-term ownership costs.
For early decision-making, the table below provides a high-level comparison of the expected 20-year cost of ownership for on-site natural gas generation. These values are intended to show relative differences, not detailed budgeting.
20-Year Cost of Ownership (Order of Magnitude)
|
Technology |
20-Year Cost of Ownership |
| Reciprocating Engines | Highest |
| Simple-Cycle Gas Turbines | Medium |
| Combined-Cycle Gas Turbines | Lowest |
Key Point:
While reciprocating engines typically have the lowest upfront cost, they are the most expensive to own and operate over time due to higher maintenance and operating labor.
CAPEX vs OPEX – Simple View
|
Technology |
Upfront Cost (CAPEX) |
Operating Cost (OPEX) |
| Reciprocating Engines | Low | High |
| Simple-Cycle Gas Turbines | Medium | Medium-Low |
| Combined-Cycle Gas Turbines | High | Low |
Key Point:
- Reciprocating engines are best suited for small, modular, or short-term deployments where flexibility matters more than long-term cost.
- Gas turbines provide a simpler plant design and more predictable ownership cost.
- As capacity increases, operating cost and complexity dominate the decision, making turbine-based solutions more favorable for long-term use.
TLDR: Reciprocating engines minimize upfront cost mut maximize long-term operating cost, while gas turbines require more capital up front but deliver lower and more stable ownership costs at scale.