MG&E Turbine Supply Agreement, Exhibit D.3.1   Tower Drawing  Description: Schematic drawing of wind tower.   MG&E Turbine Supply Agreement, Exhibit D.3.2 TOWER FOUNDATION DESIGN BASIS V82 80-METER IEC IIA WIND TURBINES JOICE, IOWA INTRODUCTION This document contains information relevant to the structural design of foundations for Vestas V82 IEC IIA wind turbines to be installed on 80-meter HH towers in Joice, Iowa FUNCTIONAL REQUIREMENTS The wind turbine foundation shall provide adequate serviceability, strength and stability for a design service life of 20 years. The maximum allowable permanent rotation of the foundation due to differential settlement is 0.17o. All foundations must be designed with a capped drainage system to allow for drainage of water/condensation out of the base of the tower.  The drain cap must be water-tight to prevent leaks in the event that hazardous materials (such as oil) are spilled in the tower. Foundation drawings shall include a requirement for corrosion protection (such as anchor-bolt caps) of the exposed portion of the anchor bolts above the tower base flange. DESIGN INPUTS It is the engineer’s responsibility to account for site factors such as proximity to bodies of water, topography, etc. in the tower and foundation designs. Design loads exerted on the wind turbine foundation are included as Figure 1. The loads provided in Figure 1 are applicable to Tower Dwg. 759075, rev 0.  Design load combinations and load factors must be applied as required by Code. A geotechnical report for this site has not been made available to Vestas.  The foundation engineer of record must obtain a geotechnical report from the developer and/or general contractor. The tower and foundation must be designed based on the recommendations and site conditions as described in the geotechnical report. Any variance from the geotechnical recommendations shall be approved in writing by Vestas. The base flange layout to be used for design of the foundation is attached to this document as Figure 2. A typical conduit layout diagram is attached as Figure 3.  This document is to serve as a guideline only and should not be used for construction. A foundation anchor bolt leveling template drawing and purchasing specification are attached as Figure 4.  The anchor bolt leveling template is intended for use during construction to align and level the anchor bolts.  It is not intended to be a permanent component of the foundation. SF# 1108570   MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 DESIGN REQUIREMENTS The wind turbine foundation shall be designed to meet the requirements of the latest editions of the International Building Code, ACI 318 and any related amendments issued at the State or local level.  It is the engineer’s responsibility to determine whether any codes relating to the design of wind turbine foundations in addition to those listed above are enforced by the building department with jurisdiction over the project.  If additional code(s) are enforced, Vestas shall be notified, and the foundation shall be designed to meet the requirements of the additional code(s). PAGE 2 OF 20 SF# 1108570  [ex102d302002.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 FIGURE 1 – DESIGN LOADS PAGE 3 OF 20 SF# 1108570  [ex102d302004.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 4 OF 20 SF# 1108570  [ex102d302006.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 5 OF 20 SF# 1108570  [ex102d302008.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 6 OF 20 SF# 1108570  [ex102d302010.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 7 OF 20 SF# 1108570  [ex102d302012.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 8 OF 20 SF# 1108570  [ex102d302014.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 9 OF 20 SF# 1108570  [ex102d302016.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 10 OF 20 SF# 1108570  [ex102d302018.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 11 OF 20 SF# 1108570  [ex102d302020.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 12 OF 20 SF# 1108570  [ex102d302022.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 13 OF 20 SF# 1108570  [ex102d302024.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 FIGURE 2 – TOWER BASE FLANGE SECTION PAGE 14 OF 20 SF# 1108570  [ex102d302026.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 FIGURE 3 – TYPICAL CONDUIT LAYOUT PAGE 15 OF 20 SF# 1108570  [ex102d302028.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 FIGURE 4 – ANCHOR BOLT LEVELING TEMPLATE PAGE 16 OF 20 SF# 1108570  [ex102d302030.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 17 OF 20 SF# 1108570  [ex102d302032.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 18 OF 20 SF# 1108570  [ex102d302034.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 19 OF 20 SF# 1108570  [ex102d302036.gif] MG&E Turbine Supply Agreement, Exhibit D.3.2 VESTAS AMERICAN WIND TECHNOLOGY DESIGN BASIS V82 – JOICE, IOWA 9/11/2006 PAGE 20 OF 20 SF# 1108570