Capacity Charges &
Load Shedding
July 28, 2015
Capacity =
Charge
kW
Demand
You control the
demand
Capacity
*
Price
Price set by ISONew England
Capacity Prices Increasing
Start Date
Current
6/1/2015
6/1/2016
6/1/2017
6/1/2018
NEMA Capacity Price
($/kW-Month)
$3.21
$3.43
$6.66
$15.00
$9.55
Rest of Region Capacity
Price ($/kW-Month)
$3.21
$3.43
$3.15
$7.025
$9.55
(Except SEMA and RI at
$11.08)
Capacity Prices are Increasing Dramatically
N
N
N
N
N
N
N
N
N
N
N N
N
Zones
N = NEMA
S = SEMA
W = WCMA
U = Undetermined (boundary
passes through community)
Potential Impact
Scenario
2015
Calculation
Cost
1000 kW * 3.43 * 12 = $41,160
2016 – Business 1000 kW * 6.66 * 12 = $79,920
as usual
2016 – Load
500 kW * 6.66 *12 = $39,960
shedding
1,000 kW (or 1 MW) is an estimate of the demand that
a municipality may have across its time-of-use accounts
Audience Polls
• Did your community load shed on 7/20?
• If yes, in how many buildings did you load
shed?
7/20 Peak Event
Actual vs Estimated Load on 7/20/2015
Estimated Load from ISO 3 Day System Demand Forecast Table
Actual Load Reported on ISO Real Time Graph
Estimated Load Updated at 10am
*Estimated Load is graphed at the mid-point of a given hour. E.g. If 3-4 PM was estimated at 24,050 MW, that load is graphed at the point of 3:30 PM.
25000
24500
24,328 MW
At 4:50 PM
24000
23500
MW
23000
22500
22000
21500
21000
20500
20000
9:30 10:00 10:30 11:00 11:30 12:00 12:30 1:00 1:30 2:00 2:30 3:00 3:30 4:00 4:30 4:50 5:00 5:30 6:00 6:30 7:00 7:30
AM AM AM AM AM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM
Scenario
Calculation
Cost
2016 – Business as usual
600 kW * 6.66 * 12 =
$47,952
2016 – Load shedding
223 kW * 6.66 *12 =
$17,822
Real-Time Tracking Tools
• The estimate on the 3-Day Capacity
Forecast is updated at 10 am
www.iso-ne.com
Real-Time Tracking Tools
• Step 1 – www.iso-ne.com
Real-Time Tracking Tools
• Step 2 – Expand graph
Real-Time Tracking Tools
• Step 3 – Mouse over
Updated Risk Thresholds
• HIGHLY LIKELY: Season Peak or Higher
• THINK!: Within 2% of Season Peak
• UNLIKELY: Out of 2% range
*One exception: Peak in 2007 was 6/10
Updated Risk Thresholds
As of 7/28/2015:
• HIGHLY LIKELY: 24,300 MW
• THINK!: >23,800 MW
• UNLIKELY: <23,800 MW
Discussion
Communication Strategy
• Communication strategy
• Start and end times for the load shed?
• What measures were implemented?
• Challenges?
• How are you tracking the impact?
How to Get Data
• One-time request: free once per account
per year
• Subscription to Energy Profiler Online tool
• Eversource: $161 per account per year
• National Grid: $154 per account per year, $76 per
account thereafter
• Install a pulse meter interface and connect
with your EMS system
• Eversource: $207
• National Grid: $167
How to Get Data
• Talk with your utility account executive or energy efficiency
rep if interested in pursuing any of the options below.
• To see the cost for accessing data via the Energy Profiler
Online subscription go to:
• Eversource: https://www.eversource.com/Content/docs/default-source/ratestariffs/151.pdf?sfvrsn=2
• National Grid:
https://www.nationalgridus.com/non_html/Optional_Int_Data_01.01.10.pdf
• To see the cost for installing a pulse meter-interface see
Option #2 at:
• Eversource: https://www.eversource.com/Content/docs/default-source/ratestariffs/152.pdf?sfvrsn=2
• National Grid:
https://www.nationalgridus.com/non_html/Opt.%20Enhanced%20Metering_01.
01.10.pdf
• *Just remember you will still need a quote to pay for all the integration with your
EMS system. EnerNOC or others may also offer pricing for real-time monitoring
services.