GreyStone Power Corporation Rate Selection Guide
GreyStone Power Corporation is a member-owned, not-for-profit electric membership cooperative (EMC) serving ~152,000 accounts across eight Georgia counties west of Atlanta. Members access billing and usage data through an online portal and mobile app backed by Sensus FlexNet AMI; the cooperative does not offer Green Button, EDI, or a public API, and interval data is available only by request.
GreyStone Power Corporation Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| Schedule GS (General Service) | Commercial/Industrial | $42.50/mo service + $8.50/kW demand (>5 kW) + tiered energy $0.134/$0.110 then $0.040/$0.035/$0.030 per kWh (2021 published, before WPCA) | Most commercial and industrial accounts |
| GS Seasonal (GS-SON / GS-SOFF) | Commercial | Season/time-differentiated General Service (see tariff PDFs) | C&I members who can shift load to off-peak/seasons |
| Load Management Service | Commercial | Incentives/credits for curtailable load (see tariff) | Members willing to allow cooperative load control |
Market Overview
GreyStone Power is a not-for-profit electric membership cooperative governed by its member-elected board. Georgia cooperative members do not have retail supplier choice; service is bundled and billed at board-approved rates. Territorial assignments fall under the Georgia Territorial Electric Service Act, and wholesale power is procured through GreyStone's supply contracts (recovered via a Wholesale Power Cost Adjustment). There is no deregulated shopping or community choice aggregation for members.
Need to pull your actual usage data to compare rates? See the GreyStone Power Corporation Data Access Guide →
Current Rate Schedules
GreyStone Power sets its own board-approved rate schedules. The primary commercial/industrial schedule is Rate 7, Schedule GS (General Service), a demand-billed tiered-energy rate; related options include General Service Seasonal On-Peak (GS-SON), General Service Seasonal Off-Peak (GS-SOFF), and Load Management Service. The dollar figures below are from the GreyStone GS tariff PDF effective June 1, 2021 (as posted). A Wholesale Power Cost Adjustment, Environmental Compliance Cost Recovery, and Regulatory Fees/Taxes are layered on each bill, so the effective rate changes over time; verify current charges on GreyStone's Rate Schedule page.
Effective: June 1, 2021 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Rate 7, Schedule GS (General Service) | commercial | Commercial/industrial electric service delivered at one point, single or three phase. Demand-billed; minimum demand 5 kW. Primary C&I schedule. | Per the June 1, 2021 GS tariff: Service Charge $42.50/mo; Demand Charge $8.50 per kW above 5 kW; tiered energy: first 3,000 kWh $0.134/kWh and over 3,000 kWh $0.110/kWh for consumption <200 kWh/kW of demand, then $0.040/kWh (>200 kWh/kW), $0.035/kWh (>400 kWh/kW), $0.030/kWh (>600 kWh/kW); Reactive Demand Adjustment $0.75 per excess kvar. Plus Wholesale Power Cost Adjustment, Environmental Compliance Cost Recovery, and taxes. | — |
| General Service Seasonal On-Peak (Rate 71, GS-SON) | commercial | Optional seasonal/time-differentiated General Service variant for C&I members. | Time- and season-differentiated General Service pricing (on-peak emphasis). Specific charges in the GS-SON tariff PDF; cite the GreyStone rate schedule page for current figures. | — |
| General Service Seasonal Off-Peak (Rate 72, GS-SOFF) | commercial | Optional seasonal/time-differentiated General Service variant rewarding off-peak usage. | Season- and time-differentiated General Service pricing favoring off-peak consumption. Specific charges in the GS-SOFF tariff PDF; cite the GreyStone rate schedule page for current figures. | — |
| Load Management Service | commercial | C&I/residential members who allow the cooperative to manage/control certain loads in exchange for incentives. | Load-control program with billing credits/incentives in exchange for curtailable load. See the Load Management Service tariff PDF for terms. | — |
Rate Recommendations by Use Case
Commercial/industrial GreyStone account on General Service
C&I members on Schedule GS should focus on managing the 15-minute peak demand and improving load factor, since demand and the winter ratchet drive a large share of the bill.
The $8.50/kW demand charge plus a winter ratchet (85% of prior summer peak) means a single summer spike inflates bills for months; declining energy tiers reward steady, high-load-factor operation.
- Track and shave the 15-minute peak
- Run operations at higher, steadier load factor
- Correct power factor if demand exceeds 100 kW
- Confirm current charges including Wholesale Power Cost Adjustment
C&I member with shiftable or curtailable load
Members who can move load off-peak or allow cooperative control should evaluate GS Seasonal Off-Peak or Load Management Service.
Seasonal and load-management options trade flexibility for credits/lower off-peak pricing; note you cannot switch applicable rates within a 12-month period.
- Model your load shape against on/off-peak windows
- Confirm the 12-month rate-switching restriction before electing
- Quantify Load Management incentives vs operational impact
Energy consultant / aggregator needing GreyStone data
Since there is no native API or Green Button, obtain signed member authorization and request interval/billing data directly, or use Nectar's API for programmatic access — see docs.nectarclimate.com.
GreyStone handles third-party access manually; planning for the 5-10 business day turnaround and confirming format up front avoids delays.
- Collect signed customer authorization with data scope and duration
- Email memberservices@greystonepower.com or call 770-942-6576
- Specify CSV/format and time period
- Consider Nectar's API for programmatic access — see docs.nectarclimate.com
Historical Rate Trends
As a not-for-profit cooperative, GreyStone passes wholesale power costs through to members via a Wholesale Power Cost Adjustment rather than formal rate cases; base schedule charges change infrequently by board action. GreyStone markets among the lowest rates in Georgia and the nation.
June 1, 2021
Current posted General Service (Schedule GS) tariff effective for bills rendered on/after June 1, 2021: $42.50 service charge, $8.50/kW demand above 5 kW, tiered energy charges.
n/a (schedule update)Overall trend: Relatively stable base rates; effective cost varies month to month with the Wholesale Power Cost Adjustment.
Next expected change: No published rate-case schedule; monitor GreyStone's Rate Schedule page and Wholesale Power Cost Adjustment updates.
Cost Optimization Strategies
For GreyStone C&I members, cost is driven by 15-minute peak demand (with a winter ratchet), energy block tiering, and reactive (power-factor) charges. The main levers are demand management, improving load factor, power-factor correction, and evaluating seasonal/load-management options.
Peak demand management
For: Demand-billed C&I (Schedule GS)
Because GS bills on the highest 15-minute kW (with a winter ratchet that carries summer peaks into winter), shaving and staggering peaks lowers the $8.50/kW demand charge for many months, not just one.
Improve load factor
For: C&I with controllable operating schedules
GS energy tiers decline as kWh per kW of demand rises ($0.040/$0.035/$0.030 above 200/400/600 kWh per kW). Running steadier, higher-load-factor operations pushes more kWh into the cheapest blocks.
Power-factor / reactive correction
For: Industrial members >100 kW with inductive loads
Where demand exceeds 100 kW, GreyStone bills excess kvar at $0.75 per kvar (kvar above one-half the measured kW). Adding capacitors/correction reduces or eliminates the reactive charge.
Seasonal / load-management options
For: C&I with shiftable or curtailable load
Members who can shift usage should evaluate GS Seasonal Off-Peak (GS-SOFF) or Load Management Service for credits in exchange for off-peak use or curtailable load (subject to the 12-month rate-switching restriction).
To implement these strategies, you need your 15-minute interval data. Learn how to download GreyStone Power Corporation interval data →
Frequently Asked Questions
How can a C&I member or consultant get interval (load) data from GreyStone Power?▾
There is no self-service interval download. The account holder views usage trends in the portal/app, and raw interval data must be requested by calling 770-942-6576 or emailing memberservices@greystonepower.com (specify time period and format such as CSV). For consultants, the member must provide signed written authorization; GreyStone then verifies it (allow 5-10 business days) and delivers data by email or secure transfer.
Does GreyStone Power support Green Button, EDI, or a public API?▾
No. GreyStone does not implement Green Button (Download/Connect My Data), ESPI, EDI (814/820/867/810), or a public developer API/OAuth. For automated multi-site collection, Nectar provides API access to this utility's billing and interval data — see docs.nectarclimate.com — or a custom arrangement can be made with the cooperative.
Which rate applies to a commercial or industrial GreyStone account?▾
Most C&I accounts are billed under Rate 7, Schedule GS (General Service), which is demand-billed on the highest 15-minute kW (with a winter ratchet) plus tiered energy charges. The GS demand charge applies to demand in excess of 5 kW, and a Wholesale Power Cost Adjustment and Environmental Compliance Cost Recovery are layered on. Confirm the current schedule and rate on GreyStone's Rate Schedule page.
How is demand determined and billed on GreyStone's General Service rate?▾
Demand is the highest 15-minute kW during the current month and preceding 11 months. For summer bills (June-October) the billing demand is the current month's peak; for winter bills (November-May) it is the greater of 85% of the prior summer peak or 65% of the current month's demand, never less than the contract minimum or 5 kW. The demand charge in the published schedule is $8.50 per kW above 5 kW.
Can a third-party aggregator pull GreyStone data automatically?▾
Yes. Nectar provides API access to this utility's billing and interval data — see docs.nectarclimate.com. Because GreyStone has no public API, such access relies on member credentials/authorization; otherwise use the manual authorized data-request process.
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