DCPI · Data Center Power Price Index

Issue 1 · Large-load tariff register (2026-11-10)

11 regulator-approved large-load (data center) tariffs or special contracts ingested, each with a case number and a source link. The tables below are the terms and rate-sheet fact layer; the issue-1 reading is the unweighted median of the cells' annual effective prices (rule under the computation section).

Price cells (full disclosure only)

Ameren's own stated all-in ~$0.062/kWh for large load (excl. riders, load-factor dependent) — corroborates the computed value · cross-check source

• Evergy Metro, Inc.：Demand = demand charge (summer 21.038 / winter 19.038) + substation grid charge 3.003 $/kW-mo; transmission-connected customers use 2.200 (0.803 $/kW-mo lower, about 1.4 $/MWh at an 80% load factor). The grid charge carries no seasonality. Customer charge $1,181.28/mo and reactive adjustment excluded per method
• Evergy Missouri West, Inc.：Demand = demand charge (summer 17.074 / winter 15.074) + substation grid charge 4.811 $/kW-mo; transmission-connected customers use 4.750 (0.061 $/kW-mo lower, about 0.1 $/MWh at an 80% load factor). The grid charge carries no seasonality. Customer charge $675/mo and reactive adjustment excluded per method
• Indiana Michigan Power (I&M, AEP)：Loads >=70MW take transmission-level I.P. as amended in 46097. Two-tier energy (first 410 kWh per kW of demand at 5.058c, over at 1.286c) blends to 3.934c at 80% load factor (584 kWh/kW-mo). The $14.700/kW-mo minimum demand charge only sets the minimum-bill floor; at 80% LF the regular path ($33.17/kW-mo) exceeds it, so the regular demand charge applies. No seasonality: summer = winter. Customer charge, reactive adjustment and riders excluded per method
• Indiana Michigan Power (I&M, AEP)：Data centres >=50MW take transmission-level standard service under LP as amended by U-21986. TOU energy (on-peak = weekdays 7am-9pm: first 210 kWh/kW at 4.753c, over at 3.002c; off-peak 3.002c) blends to 3.632c at 80% load factor (243.3 on-peak + 340.7 off-peak kWh/kW-mo). U-21986 amended terms (15-year term, 90% minimum demand, 65% minimum energy) but not prices - the current book's LP sheets still carry U-21461 rates; the MPSC has ordered a standalone data-centre class in the next rate case. No seasonality. Customer charge, reactive and riders excluded per method
• Xcel Energy (NSPM)：Demand takes the transmission-level On Peak tier (secondary 24.66/29.25 less the $3.35/kW-mo voltage discount) = 25.90 summer / 21.31 winter $/kW-mo; under flat load the off-peak demand never exceeds on-peak, so the $3.35 excess-demand charge does not bite. Two-tier energy (on-peak = 9am-9pm Mon-Fri less 7 holidays = 3,048 h/yr, 34.83% of hours; 2.751c on-peak / 1.448c off-peak, less the 0.329c transmission discount) blends to 1.5728c at 80% load factor. On the undiscounted secondary-voltage table the annual value would be 63.8 $/MWh, and 56.5 at transmission-transformed (2.35/0.334c). Customer charge $9,000/mo, the 7.14% interim surcharge and the fuel/resource riders are excluded per method - actual bills are higher. Individual ESAs (e.g. Google Pine Island, docket 26-170) remain redacted, so this cell is the rate-sheet skeleton, not what that customer pays

Computation (reproduce this yourself)

• Effective price = energy ¢/kWh × 10 + demand $/kW-mo ÷ (80% × 730h) × 1000.
• Annual value weights 4 summer and 8 winter months.
• Excludes riders (fuel adjustment, efficiency, RES), reactive charges, customer charges and taxes — actual all-in bills are higher.
• Price cells accept only 'full' disclosure (official rate sheet); reading threshold is 5 cells, currently 6.
• Issue-1 reading = the unweighted median of the annual effective prices of all full-level price cells. Unweighted because cells carry no natural weights (no volumes), and the median is robust to any single-cell anomaly. The rule was registered on the day the fifth cell was met (2026-11-11); the reading follows from the rule, never the reverse.

Third-party reference: the same modelled 25 MW data center under five tariffs (not this site's basis)

E3's May 2026 white paper (self-funded, using Halcyon tariff data) modelled the annual bill of a hypothetical 25 MW, transmission-connected data center under five tariffs, including customer, demand, energy charges and riders. These are third-party modelled values, not this site's price cells — the load shape, voltage and site assumptions are E3's and must not be mixed with our line-by-line recomputation from official rate sheets. It is shown only to give readers a cross-state order of magnitude.

Cross-state spread 3.99¢; our recomputed values of 5.5-7.7¢ sit inside the range (different basis, magnitude check only) Reference: E3 (Energy and Environmental Economics) x Halcyon Large Load Tariff Tracker（2026-05）

1. Why this index exists

Industry gap analyses name it directly: AI data center PPA prices span $68.90–115/MWh, there is no standard pricing framework, every deal is bilateral, and nobody is building the transparency layer.

The Minnesota Attorney General's office (Oct 2026) publicly alleged that Xcel redacted nearly all dollar figures in Google data center supply contracts as trade secrets, estimating billion-dollar cost shifting onto ordinary bills; the Wisconsin PSC chair put it plainly: NDAs, heavy redaction, corporate aliases and closed-door bargaining are hurting rather than helping.

Buyers, regulators and researchers all lack an independent benchmark — while the underlying dockets are legally public.

Whitespace check

Whitespace check performed 8 November 2026. Sources listed at the foot of this page.

2. Definition and formula

Stratification

3. Source register

Feeds GRVI (power price is a primary input to compute economics); same audience as NCSX-IS (neocloud creditors watch power exposure)

4. Outputs and machine endpoints

/api/v1/dcpi/latest.json /api/v1/dcpi/tariffs.json

Field shape is identical across the family: ticker / status / reading / observations / unit / cadence / methodology_version / next_publication. Parse once, cover all five.

5. Status and milestones

6. Red lines

7. How to cite

Free to cite for research and press. Always give the ticker, the version and the URL — dropping any of the three breaks machine traceability.

Other citation formats (APA / MLA / Chicago / BibTeX) · Data licence