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UnitTrack · Disclosure-controlled report
Gas — Metro
Harbor City Gas (synthetic)
Generated 2026-07-28 21:50 ·
Grouped by census tract · k = 15
Residual re-identification risk
worst case 5% · Low
· smallest published group 19
7/75
Census tract groups published
—
of meter reads in published output
68
groups withheld by disclosure control
15/15 rule
≥15 contributors; no single customer over 15%
Contents
Disclosure control & data provenance
Grouping the dataset into 75 census tract groups, 7 were safe to publish and 68 were withheld under the rules below. The exact share published and the grand total are withheld here so the small suppressed group can't be recovered by subtraction; the published output carries a worst-case re-identification risk of 5% (Low).
Data quality & reliability
14400
Loaded reads
0 rejected & quarantined
13.8%
Estimated reads
utility estimate flag
1.8%
Negative usage
rollovers / net metering
1810
High outliers
Tukey 1.5·IQR (1977)
Anomalies are flagged, not dropped; rows failing validation are quarantined as rejected. 1356 reads (9.4%) lack coordinates and are excluded from spatial views.
Methods & authorities
-
Minimum-count (k-anonymity) — 41 groups withheld
(triggered by your minimum group size k = 15).
Sweeney, k-anonymity (2002); ESSnet/Eurostat SDC Handbook (Hundepool et al.) — minimum-frequency / threshold rule · Meets/exceeds: CA CPUC D.14-05-016 ("15/15"); IL 220 ILCS 33
-
(n,k)-dominance — 27 groups withheld
(triggered by your top-1 dominance limit p = 15%).
ESSnet/Eurostat SDC Handbook §4.2 (Hundepool et al.) — sensitive cells in magnitude tables
-
PII handling — identifiers are excluded from the analytic
path; only disclosure-controlled aggregates are reported.
NIST SP 800-122; NISTIR 8053
Published results
| Census tract | Total consumption (therms) | Contributors | Status |
|---|---|---|---|
| (no location) | * | — | Withheld |
| Tract 9.02 | * | — | Withheld |
| Tract 23.04 | * | — | Withheld |
| Tract 11.03 | * | — | Withheld |
| Tract 23.14 | * | — | Withheld |
| Tract 21.11 | * | — | Withheld |
| Tract 9.01 | * | — | Withheld |
| Tract 14.02 | * | — | Withheld |
| Tract 23.16 | * | — | Withheld |
| Tract 13.12 | * | — | Withheld |
| Tract 23.25 | * | — | Withheld |
| Tract 23.27 | * | — | Withheld |
| Tract 8.04 | * | — | Withheld |
| Tract 8.02 | * | — | Withheld |
| Tract 24.48 | * | — | Withheld |
| Tract 23.15 | * | — | Withheld |
| Tract 14.01 | * | — | Withheld |
| Tract 13.10 | * | — | Withheld |
| Tract 4.02 | * | — | Withheld |
| (outside area) | * | — | Withheld |
| Tract 7 | * | — | Withheld |
| Tract 23.23 | * | — | Withheld |
| Tract 23.13 | * | — | Withheld |
| Tract 10 | 87,257 | 25 | Published |
| Tract 12 | * | — | Withheld |
| Tract 8.01 | * | — | Withheld |
| Tract 5 | * | — | Withheld |
| Tract 24.47 | * | — | Withheld |
| Tract 23.26 | * | — | Withheld |
| Tract 13.09 | * | — | Withheld |
| Tract 11.01 | * | — | Withheld |
| Tract 23.07 | * | — | Withheld |
| Tract 13.08 | * | — | Withheld |
| Tract 23.20 | * | — | Withheld |
| Tract 8.03 | * | — | Withheld |
| Tract 4.01 | 47,386 | 24 | Published |
| Tract 21.09 | * | — | Withheld |
| Tract 24.11 | 43,255 | 27 | Published |
| Tract 13.11 | 38,892 | 19 | Published |
| Tract 19.23 | * | — | Withheld |
| Tract 16.02 | 36,204 | 20 | Published |
| Tract 16.05 | * | — | Withheld |
| Tract 13.04 | 32,949 | 20 | Published |
| Tract 24.03 | 32,540 | 25 | Published |
| Tract 3.09 | * | — | Withheld |
| Tract 13.07 | * | — | Withheld |
| Tract 3.08 | * | — | Withheld |
| Tract 23.21 | * | — | Withheld |
| Tract 11.02 | * | — | Withheld |
| Tract 23.24 | * | — | Withheld |
| Tract 21.10 | * | — | Withheld |
| Tract 20.03 | * | — | Withheld |
| Tract 3.07 | * | — | Withheld |
| Tract 16.03 | * | — | Withheld |
| Tract 14.03 | * | — | Withheld |
| Tract 6.05 | * | — | Withheld |
| Tract 16.04 | * | — | Withheld |
| Tract 9800 | * | — | Withheld |
| Tract 6.01 | * | — | Withheld |
| Tract 19.11 | * | — | Withheld |
| Tract 21.07 | * | — | Withheld |
| Tract 23.10 | * | — | Withheld |
| Tract 20.06 | * | — | Withheld |
| Tract 23.22 | * | — | Withheld |
| Tract 6.07 | * | — | Withheld |
| Tract 24.13 | * | — | Withheld |
| Tract 24.43 | * | — | Withheld |
| Tract 24.44 | * | — | Withheld |
| Tract 19.10 | * | — | Withheld |
| Tract 6.06 | * | — | Withheld |
| Tract 2.04 | * | — | Withheld |
| Tract 20.07 | * | — | Withheld |
| Tract 20.02 | * | — | Withheld |
| Tract 3.02 | * | — | Withheld |
| Tract 19.19 | * | — | Withheld |
Consumption profile
Total consumption by census tract — published groups (therms)
Consumption distribution & inequality
0.852
Gini coefficient
Gini 1912; Lorenz 1905
7.535
Coefficient of variation
std ÷ mean
1775
Median use / account (therms/yr)
across 1200 accounts
177
High outliers
Tukey 1.5·IQR
Lorenz curve — cumulative use vs. cumulative accounts
Percentiles (therms/yr)
| 10th | 836 |
| 25th | 1164 |
| Median | 1775 |
| 75th | 3218 |
| 90th | 10304 |
Customer class × month
Total consumption — class (rows) × month (columns); blanks were suppressed (therms)
Geography & spatial clustering
Random
Spatial pattern
not significant
0.092
Moran's I
expected -0.167
0.3
z-score
over 7 areas
0.7672
p-value
two-tailed
Total consumption by area (therms) — uncolored areas are suppressed
No significant spatial pattern — values look randomly placed.
1 hot spot (Getis-Ord Gi*, p < 0.05).
Global Moran's I, rook contiguity; normality-assumption inference. Moran (1950); Cliff & Ord (1973). Basemap © OpenStreetMap/Carto.
Weather & seasonality
56.2%
Weather-sensitive (heating-driven)
ASHRAE G14; PRISM
100.0% / 0.0%
Heating / cooling split
of weather-driven use
—
Weather-normalized annual
restated at normal year
0.874
Model fit (R²)
degree-day regression
E = 417 + 2.5241·HDD · base 65°F · 11 months
Seasonal use — 72.6% above winter baseline, peak Feb
Average monthly consumption vs. winter baseline (therms)
Winter-baseline (minimum-month) method. Standard seasonal decomposition.
Benchmarking — Energy Use Intensity
85.3
Median EUI (kBtu/ft²/yr)
EPA ENERGY STAR; DOE/EIA CBECS
1200
Buildings benchmarked
floor area & ≥ 2 months
1 kWh = 3.412 kBtu; 1 therm = 100 kBtu (EIA)
reference constants v2024.1
EUI distribution across buildings (published classes)
By customer class (site EUI, kBtu/ft²/yr)
| Class | Bldgs | p25 | Median | p75 | vs nat'l |
|---|---|---|---|---|---|
| RESIDENTIAL | 995 | 53.7 | 85.4 | 138.1 | 285% |
| COMMERCIAL | 174 | 38.2 | 83.3 | 172.7 | 119% |
| INDUSTRIAL | 31 | 34.8 | 108.8 | 174.7 | — |
Within-dataset EUI percentiles vs. class peers. “vs nat'l” is coarse all-fuel context (CBECS 2018 / RECS 2020), not the ENERGY STAR 1–100 score. Small classes withheld.
Energy burden & equity
Burden = annual energy cost ÷ tract median household income at $1.52/therms. Bands: ≤6% affordable · 6–10% moderate · >10% high (ACEEE).
4.11%
Median tract burden
across 33 tracts
1
High-burden tracts
> 10% of income
18.2%
Households high-burden
139 of 765
42
Tracts suppressed
below min-count
Energy burden by census tract (% of income)
Energy burden = annual energy cost ÷ median household income; ≤6% / 6–10% / >10% cut points (6% affordability from the Home Energy Affordability Gap [Fisher, Sheehan & Colton]; used by DOE/NREL LEAD & ACEEE — convention, not statute). Income: ACS 5-year B19013. Rate: EIA average retail price. Tract-level per DOE/NREL LEAD; metered-commodity burden is a lower bound on total home-energy burden.
Measurement & verification (IPMVP Option C)
Baseline model fit on 5 months before Jul 2023; savings measured over the following 6 reporting months. Synthetic demo with no intervention — avoided energy near 0% is the method working correctly.
32.8%
Avoided energy
1937 therms/meter
5912
Adjusted baseline (CBL)
therms/meter expected
3975
Reporting actual
therms/meter metered
0.929
Baseline fit (R²)
degree-day model
Reporting period: metered actual vs. adjusted baseline (therms/meter)
IPMVP Option C (EVO 10000-1:2016); ASHRAE Guideline 14; base-65°F degree days (US EIA / NOAA).
Differential privacy — an alternative release
An alternative to suppression: instead of hiding small groups, calibrated Laplace noise is added to each count (ε = 1.0, scale b = 1.0) so no individual's presence can be inferred while totals stay useful. Mean absolute error ±1.0 across 30 groups.
True vs. differentially private counts by geography
Laplace mechanism, ε-differential privacy. Dwork, McSherry, Nissim & Smith (2006); Dwork & Roth (2014); US Census Bureau 2020 DAS.
Appendix — policy & citations
Disclosure-control settings
| Governing standard | 15/15 rule |
| Minimum group size (k) | 15 |
| Dominance (top-n ≤ p) | 1 ≤ 0.15 |
| Min accounts for models | 15 |
| Grouping | Census tract |
Standards & sources cited
- k-anonymity — Sweeney (2002); ESSnet/Eurostat SDC Handbook
- (n,k)-dominance — ESSnet SDC Handbook §4.2; CPUC 15/15
- Inequality — Gini (1912); Lorenz (1905)
- Spatial — Moran (1950); Cliff & Ord (1973)
- Weather / M&V — ASHRAE Guideline 14; IPMVP Option C; PRISM
- Benchmarking — EPA ENERGY STAR; DOE/EIA CBECS/RECS
- Load — NREL UMP; BPA M&V Peak Demand
- Burden — ACEEE; US Census ACS
- Differential privacy — Dwork et al. (2006); US Census 2020 DAS
- PII — NIST SP 800-122; NISTIR 8053; NIST SP 800-188
- Methods & Formulas — every rule & analysis with its formula-as-implemented and primary citation
Synthetic sample data — for demonstration, not distribution. Generated by UnitTrack, a Polish Clover Solutions product · 2026-07-28 21:50.