Water and Energy Efficiency: The Next Big Thing
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Water and Energy Efficiency: The Next Big Thing: By Laura Van Wie McGrory, Vice President, International Programs, Alliance to Save Energy
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Water and Energy Efficiency: The Next Big Thing
- 1. Policy Summit Laura Van Wie McGrory October 4, 2011 Vice President, International Programs Water and Energy Efficiency: The Next Big Thing
- 5. PROBLEM: 80% of water flowing to homes lost through leaking main pipes and home plumbing fixtures! TECHNICAL SOLUTION: Pressure Management • Automated pressure management valves on each supply line • Reduced high bulk pressure; further reductions @ night • $800,000 construction commissioned Sept 2005 FINANCING SOLUTION: Performance Contracting • Water pressure management firm acting as ESCO • Build-Operate-Train-Transfer to municipality after 5 years • Fees: firm gets 20% of savings Case Study: Emfuleni, South Africa
- 6. • Payback period: <3 months • Annual Savings: Money : US $ 3.8 million Water : 2.1 billion gallons a reduction of >30% Energy : >14 million kWh • CO2 Reductions: 12,000 tons/year Emfuleni Results
- 7. Case Study: Bucks County Water & Sewer Authority Located in eastern Pennsylvania Created in 1962 $65 million in Annual Revenue 78,000 Retail Water and Sewer Customers 385,000 Wholesale and Retail Population Served in Bucks & Montgomery Counties PA One of 27 PA water systems serving over 100,000 people Nearly 1,000 of these large systems across the US BCW&SA has grown by 300% over the last 15 Years through Acquisitions
Hinweis der Redaktion
- Energy and Water are Linked in many ways Energy is needed to extract and convey water to residential, commercial and industrial end users Energy is needed to treat water for end users Water is needed in electricity generation (power plant cooling) The Challenges: Leakage Wastes Energy and Water Mexico: In many cities,33% of water supplied is lost before reaching consumer Brazil: In some municipalities, 44% lost to leaks and system inefficiencies. India: 50% is often lost (less in very large cities, can be more in smaller cities)
- Term coined to describe nexus between water and energy The goal is to provide cost effective water and wastewater services while reducing energy consumption, water wastage and protecting the environment Been doing Watergy for more than 10 years and have long standing working relationships in our India, South Africa, and Mexico offices, but worked in over 16 countries. • In developing countries, often one-third to one-half of the volume of water produced is lost to leaks and system inefficiencies. Globally: Energy among the top 3 costs to water utilities, often coming second after labor costs. In d eveloping country cities in particular: Energy generally the most expensive cost of supplying water Often use 50-60% of their budgets to move water around!
- Losses : Enough to fill two Olympic-size swimming pools every hour SUM: Municipality had leaks on end user side and on the main. It’s difficult to pinpoint all the leaks on the main system, so we opted to do pressure management. We regulated the pressure in the water main and installed an automated pressure management valves to regulate water flow based on demand. So when not in use, pressure was reduced, and thus leaks disappeared. The lower the pressure behind a leak the less water is going to escape through that leak. • Installed automated pressure management valves on each supply line. These valves continually modulate the flow of water in a way that ensures a lower constant downstream pressure. Controllers that automate valve function were also installed, allowing for operating pressures to be varied depending on the time of day. • Reduced high bulk pressure; further reductions @ night: With the aid of installed controllers, downstream pressure was automatically reduced further during especially night times when real demand for water is almost zero. This dramatically reduced water wastage from leaking pipes and fittings. In addition to providing technical advice, the Alliance helped boost the political will to carry out the project, by demonstrating previous successes with the Watergy program, and helping to design a low-risk strategy for the utility and municipality (based on a financing arrangement using a performance contract). Other notes: (Alliance – played an advisory role to this project. Main consultants – WRP)
- The total cost of the Pressure Management Installation was less than $800,000. The pressure management valves themselves were activated and the project had paid for itself through achieved water savings with a payback period of less than 3 months.
- Treating & transporting water accounts for ~3% of total US energy Typical Eastern US Water System Some Pumping/Storage High Quality Raw Water – Conventional pre-treatment is sufficient Distribution system based on history, not rational design Energy is one of the top three expenses: Total energy costs: $1.7 M in 2009 Total energy use: ~20 million kWh in 2009 Scope of Bucks County Watergy project: 4 wastewater treatment plants (treat more than 2 MGD) 3 pumping stations (average total flow ~25 MGD) Account for 69% of total energy consumption Watergy Team: Alliance, Policy Navigation, Process Energy
- Three components to BCWSA Energy Management Plan Components 1 & 2 are estimated to save ~330,000 kWh and $29,000. With a total cost of $22,000 the simple payback is ~9 months.