Hydrostor TerraTM

Advanced Compressed Air Energy Storage

Hydrostatic pressure naturally created by water at depth makes Hydrostor TerraTM one of the cleanest, most economical bulk energy storage solutions available today.

Hydrostor TerraTM is true bulk energy storage that addresses the issues of renewable intermittency, grid load balancing, reserve capacity, peak shaving and T&D congestion.

Hydrostor’s Advanced Compressed Air Energy Storage (A-CAES) technology leverages a purpose-built, in-ground cavern for emissions-free bulk energy storage.

With proven components from Tier 1 OEM manufacturers, our clients have confidence that the Hydrostor system will perform reliably for the life of the equipment, with support from a global service network.

We use proven construction techniques that minimize risk and environmental disturbance, as well as a superior thermal management system that maximizes our efficiency.

Hydrostor and AECOM have partnered to jointly develop, market and construct A-CAES systems globally.

How A-CAES worksHydrostor’s A-CAES converts electricity to compressed air, which is stored in an underground air accumulator until needed for generation.

The heat generated when compressing the air is captured and stored for use during generation, known as Adiabatic CAES. This adiabatic operation increases the system’s efficiency and eliminates the need for additional heat from fossil fuels (and the associated costs and emissions).

To satisfy the need for electricity, the system reverses the air flow, allowing hydrostatic pressure to force the air out of the TerraTM and back to the surface where the stored heat is added back into the air stream.

The now-heated air travels through a turbo expander that drives a generator, which efficiently converts the energy stored in the air back into electricity for the consumer.

Applications

Flexible peaking plant generation

Integrate renewables to on-demand

discharge

Transmission decongestion

Reserve capacity

Ancillary services

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CONVERT ELECTRICITY TO COMPRESSED AIR

CAPTURE HEAT IN THERMAL STORE

STORE COMPRESSED AIR IN ACCUMULATOR

CONVERT COMPRESSED AIR TO ELECTRICITY ON DEMAND

Hydrostor TerraTM

Shown below, a typical TerraTM site would be located near a local water body. This location allows water to easily flow in-and-out of the TerraTM via piping as the pressurized air is added, stored and released. The water in the TerraTM shaft and cavity holds the air under pressure until ready for generation.

1. Water flows to/from the adjacent water source through the flooded shaft2. Bi-directional air flow to/from TerraTM

3. Thermal management for adiabatic fuel-free expansion4. Air-to-electricity conversion equipment

No temperature impact on water and zero emissions

2. Air pipe

Hydrostatic water

1. Channel from adjacent water source

3. Thermal store

4. Air compressor turbo expander generator

Pressurized air

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The system offers a small mechanical footprint, with charge and discharge equipment having a compact configuration.

Advantages − Low cost. Lowest installed cost/kWh available today for bulk energy storage.

− Utility scale. Up to 100s of MW, 4-hour to multiple-day duration.

− Green energy on-demand. Environmentally friendly with no hazardous chemicals.

− Long life. 30+ years without efficiency loss on mechanical and up to 100 years on accumulator.

− Adiabatic process. Emission-free (no fossil fuel) operation.

− Maximum flexibility. Charge, discharge, and storage capacity are set independently.

− Roundtrip AC/AC efficiency. Approximately 60% without efficiency loss over life of the asset.

− Multiple air storage options. Terra™, cavern, marine.

− Expandable storage. Projects easily modified to accommodate changing grid requirements.

− Excellent reliability. Mechanical equipment from Tier 1 OEM suppliers matched with AECOM engineering expertise.

− Black start and voltage support. Ancillary benefits provided by synchronous equipment.

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A-CAES provides operational and environmental benefits to cities and generating assets.

Applications

Replacing fossil fuel peaker plants − Fossil-fuel-free peaking and baseload power − Large-scale storage, up to 100s of MW with

4-hour to multiple-day duration − Repurpose aging fossil-fuel power plants

and plants subject to once-through-cooling regulations with a carbon free energy storage asset

− Replace diesel generation with low-cost renewable energy

− Urban power plant locations are possible, providing zero-emission load shifting, grid balancing and T&D deferral solutions

− 24-hour voltage support, emergency power, black start, and power quality conditioning

− Lower energy costs through elimination of peak power price

− Capitalize on electricity price volatility

On-demand renewable energy generation − Combined installation of wind or solar generation

with storage to supply 100% green electricity − Renewable power on demand − Lower cost than diesel/HFO power − Replacement of fuel shipments, oil storage and

aged contaminated sites − Baseload or peaking plant designs

Optimizing wind and solar − Renewable energy on demand, 24/7 − Time-shift generation to maximize project

economics − Eliminate renewable curtailment − Baseload or peaking plant designs − Increase distributed renewable generation with

single central storage resource − Electrical independence for islands, micro-grids

and off-grid locations − Turnkey installations can support 24-hour energy

supply, load levelling or both

Transmission and distribution deferral − New transmission lines are expensive, have long

lead times and are challenging to permit − Maximize existing T&D capacity during off-peak

times, bringing power outside transmission bottlenecks for system charging

− Time-shift generation to maximize economics − Emission free A-CAES can be installed in dense

urban areas where fossil fuel plants are prohibited − Provides reliable back-up power for critical areas

and infrastructure − Ancillary grid services located exactly where

needed

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Project experience

− Toronto Island, Ontario Canada Utility host: Toronto Hydro Power rating: 660 kW, with a phased expansion to multi-MWh energy rating

− Goderich, Ontario Canada Owner: NRStor Inc., contracted by the IESO Power rating: 1.75 MW Energy rating: 7 MWh

− Hydrostor continues to develop projects up to 300 MW

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As a global leader within the energy industry, AECOM offers integrated services to deliver energy storage projects from concept through planning, construction and delivery.

AECOM’s broad range of project management services, coupled with our technical expertise, allows us to thoroughly plan, develop and execute environmental reviews, permitting, EPC and commissioning for a wide range of projects.

To serve our clients, we provide a variety of services required to execute and deliver energy storage projects across the globe. These services include integrated energy solutions that build upon our wide range of solar and wind energy experience.

For energy storage, AECOM’s experience and resources include:

Concept assessment − Site selection − Technology selection − Conceptual design and

system sizing − Grid-interconnect investigation − Risk analysis

Techno-economic assessment − Feasibility studies − Social impact assessment − Cost estimations − Financial modeling − Economic benefit assessment − Ancillary service benefits

Project planning − Planning and permitting − Environmental impact assessments − Stakeholder management plan − Resource planning − Life cycle analysis − Risk and hazard assessments − Cost assessment

Project management − Construction and site management − Environmental health, and safety management − Commissioning services − Project reporting and stakeholder management − Contract management

EPC − Mechanical − Electrical − Civil − SCADA − Grid connection and integration − Transmission and distribution − Water/marine − Fire and safety assessment − Construction and site management − Procurement services − O&M schedules − Operational efficiency assessments

Complete solutions

Fully financed turnkey solutions

Warranty provided

Operations and maintenance

services

Sizing flexibility to meet varying

requirements

Single contract option

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aecom.com

For more information:

Travis Starns Business Development Manager, Energy Storage 303-740-3856 travis.starns@aecom.com

Request technical information and project pricing at: www.hydrostor.ca

About AECOM

AECOM is built to deliver a better world. We design, build, finance and operate infrastructure assets for governments, businesses and organizations in more than 150 countries. As a fully integrated firm, we connect knowledge and experience across our global network of experts to help clients solve their most complex challenges. From high-performance buildings and infrastructure, to resilient communities and environments, to stable and secure nations, our work is transformative, differentiated and vital. A Fortune 500 firm, AECOM had revenue of approximately $17.4 billion during fiscal year 2016. See how we deliver what others can only imagine at aecom.com and @AECOM.

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