1. Irvine Ranch Water District Distributed Energy Storage Case Study
Urban Water Institute Annual Conference
San Diego, CA
August 17, 2017

2. Discussion Topics IRWD Basics Energy Management at IRWD
Battery Storage Program Implementation

3. An Introduction to the District.
IRWD Basics
An Introduction to the District.

4. IRWD Services Drinking Water
5 water treatment plants
27 Wells and 36 reservoirs
1,760 miles of water pipeline
Sewage Collection 1,070 miles of collection pipeline
Recycled Water 2 recycled water plants miles of recycled water pipeline
Urban Runoff Treatment IRWD San Joaquin Marsh
27 wetland treatment sites

5. Energy Management at IRWD

6. Background Electric industry is changing:
33% renewable energy by 2020
50% renewable energy by 2030
Potential electricity issues in Southern California:
San Onofre Nuclear generating station
Retiring natural gas power plants
Once-through cooling policies for natural gas plants
* Curve is Net Demand: Total Demand – Renewables

7. Grid Solution – Energy Storage at IRWD
Southern California Edison (SCE) procuring 2,500 megawatts of new local resources including:
Natural Gas Fired Generation
Energy Efficiency Programs
Demand Response
Energy storage
Behind-the-meter
In-Front-of-Meter
IRWD qualifies to host energy storage sites:
Location
Energy consumption
Load profile
Johanna Substation
Santiago Substation

8. Energy Management at IRWD
Steps taken:
Developed an Energy and Greenhouse Gas Master Plan
2) Demand response and optimization:
Minimizing peak time of pumping
Flow equalization
High energy efficiency equipment
Embedded energy surcharges
3) Developed onsite generation:
Diesel and natural gas engines
Solar energy
Projects underway:
Alternative energy projects:
Bioenergy
Energy storage.
15% of IRWD’s Operating Budget is for energy expenses.

9. IRWD’s Embedded Energy Plan
Embedded energy calculated for each segment of IRWD’s supply, distribution and treatment systems.

10. IRWD Electric Demands – Peak Winter Day

11. IRWD Electric Demands – Peak Summer Day
Reductions in Response
to Time of Use Charges

12. Battery Storage Program Implementation

13. Why Battery Energy Storage at IRWD?
IRWD Strategic Goal: Energy Efficient and Reliable
Retirement of San Onofre Nuclear Generation Station
IRWD Location and Load within Constrained Grid
Availability of Grant Funding: Self Generation Incentive Program (SGIP)
Advances in Technology: Batteries, Software, etc.
Public – Private Partnership Opportunity

14. Implementation Steps
Apr 2015
Facility portfolio analysis to determine viability of each potential site (IRWD & AMS)
Develop concept and obtain buy-in from IRWD departments (IRWD & AMS)
Secure acceptance from IRWD Board of Directors (IRWD)
Retain consultant to review energy profiles and business terms (IRWD)
Select sites for application and secure SGIP funding (AMS)
Negotiate final terms for agreements (IRWD & AMS)
Complete design, procurement, and construction (AMS w/IRWD)
Aug 2016
20 months

15. AMS - IRWD Partnership Model
IRWD partnered with Advanced Microgrid Solutions (AMS).
Battery Storage: 11 IRWD sites, MW total storage.
IRWD Benefits: Savings of approx. $500,000 per year and operational efficiencies.
6 Demand Response Sites: Grid reliability to SCE and demand management to IRWD.
5 Non-Demand Response Sites: Demand management to IRWD.
Shifting Risk: Financial, Technology, Regulatory, etc.
Host Customer
IRWD
Energy Savings
Service Fee
Battery Storage
Developer
AMS
Own & Operate
Utility
SCE
Load Reduction
Utility
Contract

16. Peak Shaving using Battery Storage
Meter-level load data
Historical 15-min interval, meter-level load data used to size battery systems and design software operation.
NEW LOAD PROFILE
Customer bill consists of two key components (1) total energy used and (2) highest amount of energy used (peak). Battery system lowers costs for both
Annual load
Before
after
Peak
1,146kW
843 kW
energy
3,864 MWh
3964 MWh
Peak date
9/3/2013
Battery state (%)
1200
900
600
300
100% 0%
Battery/load (kW)
Native Load (kW)
Battery state(%)
Post-battery load(%)
Battery in, out
Custom designed battery operations
Custom-designed for each facility and optimized based on host customer rates / utility restrictions (e.g. when battery can be charged or export to grid
AMS Tariff engine, captures savings in real time
IRWD pays for two things on our energy bill: total energy consumed and the peak amount--or highest rate--of energy we consume in any given 15 minute interval during a given month
This load profile would be similar to IRWD main office building it is a 600 kW/2400 kWh -- RA Capacity: 433 kW / 1733 kWh --
IRWD would use a little more energy than pre-battery (must charge the battery), but still save some on the energy portion of the bill because of the time of the day the battery is charged
Real-time optimization software
Learns and forecasts when battery dispatches to shave peak to reduce costs
Scheduled Battery dispatch
Battery dispatch instructions scheduled by utility for load shifting during peak.

17. Deep Aquifer Treatment System (DATS)
Web Portal View

18. Paul A. Cook, P.E. IRWD General Manager cook@irwd.com
(949)
15600 Sand Canyon Avenue, Irvine, CA 92618 18