Tri-State Staff

Peter Mandelstam is Executive Director of GRID Alternatives Tri-State, an affiliate of GRID Alternatives, Inc., the nation's largest solar non-profit. GRID has installed over 7,000 systems since 2004, and trained more than 27,000 people. Tri-State covers NY, NJ, and CT. Previously, Peter was the founder & CEO of a number of on land and offshore wind development companies, including Arcadia Windpower Ltd., Green Sail Energy LLC, and BlueWater Wind LLC. He successfully developed Montana’s first large-scale wind project, and won the Nation’s first offshore wind Power Purchase Agreement (PPA). As a serial entrepreneur since 1998, Peter has built and sold wind energy companies; and won PPAs totaling 474 MW. In the early ‘90s, he co-founded and ran a solar energy non-profit that trained solar technicians and installed projects in the US and Latin America. He began his career in New York City politics and housing. Peter has served on numerous Boards of Directors, including the American Wind Energy Association, the national League of Conservation Voters, Alliance for Clean Energy New York, the Greyston Foundation & Bakery, and Move This World. He is a graduate of Harvard College.

Policy & Programs

Based in the New York Tri-State office, Leslie Davis is the Multifamily Housing Manager for GRID Alternatives. In this capacity Leslie assists multifamily affordable housing owners/managers and developers to implement solar PV on their properties. Leslie works very closely with these stakeholders to understand their needs, explain the benefits of going solar, and educate them about their project funding options. She brings together the no upfront cost technical assistance, contractor services and funding sources for each project. Prior to joining GRID, Leslie worked for Solar One on the Clean Energy Community Partnership on behalf of NYSERDA. She was responsible for sustainable and renewable energy outreach and education—working to establish sustainable communities. Leslie started her career in energy efficiency, conducting lighting and residential building audits. She then worked as a project manager for private real estate owners, overseeing the audit and reporting for energy efficiency measures. Leslie has a background in residential and commercial real estate and property management, which gives her an understanding of the relationship between energy efficiency and the built environment. She has her BS in Accounting from Hunter College and previously worked as an Operation Manager at ABC News, overseeing budgets and logistics for large scale events. email Leslie at:


Communications Coordinator


SolarCorps Construction Fellow
Project Manager
Solar Installation Supervisor
SolarCorps Construction Fellow

Workforce & Volunteering

SolarCorps Volunteerism Fellow