expand your influence: partnering trees and solar panels november 16, 2011 dan staley...
TRANSCRIPT
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Expand Your Influence: Partnering trees and solar panels
November 16, 2011
http://danstaley.net
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1. Basics: Solar Industry Trends2. Detail: Solar Access3. Cultivating Partnerships:
Outlining Strategies
Agenda
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• WHY: Making space for Green Infrastructure
• By ~2040: 50% of all buildings will have been built in the last 50 years (‘Next 100 million problem’)
• Energy will be one of humanity’s top challenges in coming decades: Solar part of ‘Silver Buckshot’
• Green Infra expansion is excellent policy in cities
Challenge and Opportunity
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Intro and Background
• Solar Power Collected Two Ways:– Directly: Photovoltaic (PV) panels mounted on ground, pole, or rooftop
– Indirectly: Concentrated Solar Power (CSP) – mirrors and collectors
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Solar Power Collection (PV)
• Local Power Collection and Distribution
PV panels are akin to a plant leaf – a shade intolerant leaf
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Solar Industry Now
• Growing rapidly, costs decreasing rapidly
– 2010: U.S. doubled installed capacity– World growth doubling: 2015, 2019– Costs decreasing 7%/year
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Solar Industry Innovation
• Solar Industry Innovating Rapidly• Akin to Moore’s Law
Solyndra
Thin film roof tiles Solar
glass
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Solar Access
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Solar Access Definitions
• Solar Access:
The ability to receive unobstructed direct sunlight (“right to light”)
• Solar Access Zone:
The 3-dimensional clear space or volumetric shape (“wedge”) needed to allow unobstructed sunlight to reach a solar collector, window, building, garden, etc. for a given time period
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Solar Access Visualizations
Sun path chart
Sky dome path
Sun path volumetric“wedge”
defining the accesszone
2-D 3-D
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Common Solar Access Depictions
Plan view(landscape, land
use)
Computer model of sunpath
(architectural)
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• No ‘right to light’ in U.S.: in dicta• U.K.: Common Law (“Leylandii
Law”)• U.S. Circuit Court decision in 1950s • States started implementing
hodgepodge of solar strategies during 1970s energy crisis
• No U.S. standard building code for insulation (viz. Int’l Bldg Code)
• Trees often used in lieu of insulation
Solar Access Background
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• ‘10-2’ Solar Access Laws– Clear access zone from 10am-2pm at time of PV installation :: compromise law– Many in solar industry want all day access, but 9am-3pm majority of insolation
• UFers just now catching up– The most new expertise to offer
‘Green premium’ on homes with visible PV panels
Background
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Solar Access: Site Analysis Basics
1. 2.
3.
9a-3p
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Partnering Strategies
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• Alternative energy industry– Solar industry’s time is coming -- soon
• PV rental and/or leasing for collection
- Companies “lease” roofs to generate power – Power
Purchase Agreements (U.S.), Feed-In-Tariff (EUR)
- ROI often based on unfettered access
Solar Access Zone Partners
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• Alternative energy industry– Lots of smart, motivated people– Have been ready and waiting for widespread deployment since the 1970s– Technology catching up with their ideas– Businesses, banks catching up too– Urban Foresters last piece of puzzle for efficient cities: Green Power Partners
About Your Partners
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Solar access needs1. Need new tools and visuals to help
others choose and site trees
2. Need guidance to help grow trees in time periods: how tall/wide in 20 years, at maturity
3. Decsionmaking at different scales: tree, parcel, street, municipal
Industry Needs
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Solutions: Don’t Be Afraid of Shade
• Siting • Species
What and where
• Scale• Scenario
When and why
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Siting: What and Where
Solar Smart clearance pruning and projected time to next maintenance: ROI
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Species: What and Where
What small-statured species go here?
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Scale: When and Why
Bulls eye for single tree clearance over time
35 ft tree, 20 ft distance to PV arraySept.19 @ 2:00 pm
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Scale: When and Why
• Siting: Solar Smart Zones as code/aid for solar access
Sept 22 @ 3:00 pm
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Scale: When and Why
• Siting: Solar Smart Zones by structure, height, and placement on lot
Sept 22 @ 3:00 pm
Sept 22 @ 3:00 pm
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Solutions: Scaling Up
• Scale: Solar Smart Streets• Scenario: Height after 10, 20 years
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Solutions: Projects to Add Value
• Solar Access Zones • Solar Smart Species (and where)• Solar Smart tree maintenance/pruning• Solar Easements: green neighborhoods• Solar Smart Streets: setbacks, street tree species by side of street & direction• Solar Smart Sustainable Business Improvement Districts
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Your Solar Access Partners
Don’t Be Afraid of Shade!You’re both innovative
Both will benefitPartners in efficiency
Ready to goMotivated expertsNot a tree hugger
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Solar Access Recap
• Solar access is coming – get out in front!• 9-3 access better than 10-2 and you can make it happen• Right tree, right place, right reason• Solar Smart trees, zones, maintenance• Solar folks have the tools except for tree scenarios – need a green power partner
– They are smart and motivated to get it right – the perfect partners
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Thank you!
Q&A
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Expand Your Influence:
Additional messaging and ideas for promoting change
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Key References
Context Sensitive Solutions in Designing Major Urban Thoroughfares for Walkable Communitieshttp://www.ite.org/bookstore/RP036.pdf
Smart Growth: A Toolkit for Realtors®http://www.realtor.org/smart_growth.nsf/pages/toolkit_smart_growth
CITY TREES sustainability guidelines & best practices http://www.treetrust.org/pdfs/citytrees-bonestroopilot.pdf
* ASES 2010
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• Trees shall have adequate rooting volume as determined by…• Trees shall have sufficient distance from infrastructure as determined by…
More Design Standards
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PV Siting and Design
• As little as 5% blockage can affect panel
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Solutions: Don’t Be Afraid of Shade
Tree shadow lengths on ground on July 22 @ 3:00 pm
50 ft ht 35 ft ht 20 ft ht
55 ft lth 39 ft lth 22 ft lth
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Changemaking Reasons
• Multiple reinforcing benefits• Conflict avoidance• Co-location• Support multiple goals and/or plans• High design standards• Environmental: stormwater, human health, urban heat island, air quality, energy savings, safety
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• Comprehensive Plans– Usually at City, County scales – Set agenda for development
• Set high-level goals• Set Green Infrastructure as a goal• Green Infrastructure supports many planning and community goals
Take-home Messages
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More Take-home Messages
• Use Green Infrastructure as a Stormwater Utility
• Re-think how Grey Infrastructure is sited• Green Infrastructure supports many planning and community goals• Many actors have different pieces of a finished puzzle