ERCOT vs PJM: Which Grid for Your Datacenter?
Should I build my datacenter in ERCOT (Texas) or PJM (Mid-Atlantic)?
ERCOT offers 30% lower power costs ($0.045/kWh vs $0.065/kWh) and no capacity market charges, but has higher curtailment risk and a 410 GW interconnection queue (87% from data centers). PJM has more stable grid operations but higher all-in power costs. ERCOT Batch Zero projects target 18-24 months; non-Batch Zero face multi-year waits. Choose ERCOT for cost optimization, PJM for reliability.
Last updated: April 2026
Head-to-Head Comparison
| Metric | ERCOT (Texas) | PJM (Mid-Atlantic) | Advantage |
|---|---|---|---|
| Average Power Cost | $0.045/kWh | $0.065/kWh | ERCOT |
| Interconnection Queue | 410 GW (18-24mo Batch Zero, multi-year non-Batch) | 260 GW (3-5 years, cluster reform pending) | Tie |
| Capacity Market | None (energy-only) | Yes ($329-333/MW-day, 833% surge) | ERCOT |
| Curtailment Risk | Higher (summer peaks) | Lower (more reserves) | PJM |
| Renewable % | 35% (wind/solar) | 8% | ERCOT |
| Grid Reliability | Variable (Winter Storm Uri) | More stable | PJM |
| State Incentives | No income tax + Chapter 313 | Sales tax exemptions | Tie |
Decision Framework
Choose ERCOT If:
- •Power cost is primary driver (training workloads)
- •Can tolerate occasional curtailment
- •Want to co-locate with renewable generation
- •Can target Batch Zero (18-24 month) timeline or plan for multi-year non-Batch wait
- •No state income tax is valuable
Choose PJM If:
- •Reliability is non-negotiable (financial services)
- •Need proximity to East Coast customers
- •Want faster interconnection timeline
- •Building latency-sensitive inference
- •Existing ecosystem in Northern Virginia
Frequently Asked Questions
Why is ERCOT power so cheap?
ERCOT is an energy-only market with no capacity payments, meaning generators only get paid when producing. Combined with abundant wind/solar and no interstate transmission costs, wholesale rates are 30-40% below national average.
What happened during Winter Storm Uri?
In February 2021, ERCOT experienced cascading failures during extreme cold, causing widespread blackouts. Post-Uri reforms include weatherization requirements and improved reserve margins, but the energy-only market structure remains.
What is PJM's capacity market and why did it spike?
PJM runs a capacity market where generators are paid to be available. Prices surged 833% from $29/MW-day to $269/MW-day in one auction, then hit the FERC cap at $329-333/MW-day. Data center demand drove 63% of the increase, adding $9.3B in costs across PJM's 13-state footprint. For a 100 MW facility, capacity charges alone now exceed $12M/year — a cost layer that effectively does not exist in ERCOT.
Can I have sites in both ISOs?
Yes, many operators split workloads—latency-sensitive inference in PJM (closer to East Coast users), training and batch processing in ERCOT (lower costs). This hybrid approach optimizes both cost and performance.
Go Deeper: Market-Specific Analysis
PJM vs ERCOT Full Comparison
Detailed queue, capacity, and cost comparison with site-level data.
PJM Capacity Auction Cost Impact
833% price surge, $329/MW-day, and $9.3B in data-center-driven costs.
Texas Site Selection Playbook
ERCOT-first screening: power, water, interconnection, incentives.
Ohio / PJM Site Selection
AEP tariff, PJM queue, and Columbus hyperscale corridor analysis.
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