NIPPON TELEGRAPH AND TELEPHONE CORPORATION International Procurement Office; Tokyo Opera City Tower 26F 20-2 Nishi-Shinjuku 3-chome Shinjuku-ku, Tokyo 16314 Japan

28 -- WIND ENERGY CONVERTER SET SOL IPO.08-416 DUE 022497 POC Point of Contact -- NTT America, Inc., Head Office, 101 Park Avenue, 41st Floor, New York, NY 10178, 212/808-2296 also NTT America, Inc., Pacific and Western Division 700 E. El Camino Real, Suite #200, Mountain View, CA 94 040, 415/940-6565 WEB: NTT International Procurement Information Home Page, http://wwwipo.nttinfo.ntt.co.jp. This public notice is to request suppliers to provide NTT with gener al referential information on similar products or technology prior to procur ement of the intended product (mentioned below) by NTT. This public notice is also to request that any suppliers wishing to participate as a subcontrac tor in the procurement program of this product should declare their intentio ns to that effect. This public notice is not intended to guarantee public n otification of procurement of the product. (1) Name: Wind Energy Converter set (2) Overview: The product requested is a Wind Energy Converter set that generates electricity using wind as its energy source.This generator can be connected to a telecommunications power supply, or to a general distribution network and used as a grid-connection for AC power supplies, or as a stand-a lone D.C. power supply.The system makes efficient use of renewable energy re sources. $B!! (JWind Energy Converter sets consist of a wind generator and include blades and tower, controlunits, supervisory units, and electrical wiring. (3) Contents of RFI: NTT is inviting the following types of information on a product or technology similar to the above-mentioned system. This is not, h owever, a request for suppliers to provide proprietary and/or confidential i nformation, 1) Technical information (a) Capacity series: -Standard capacit y series and grid-connection set, interconnection power units and receiving and distribution power units. (b) Specifications and technical details: -- G eneral description, Detailed description (Rotor,Blade,Gear, Generator,Tower, Control unit, Yaw unit,Rotor brake unit,Grid connection, Interconnection pow er units and Receiving and distribution power units, Remote supervisory sys tem, Drive, Protection unit, Data collection unit, Foundation, Others (Hub, Main shaft, etc)) -Detailed breakdown of weight . -Idling rotation start-u p threshold wind speed, Idling rotation cessation threshold wind speed, Powe r generation cut-in wind speed, Power generation cut-out wind speed, Sustain ed output wind speed. (c) Product life span (d) Method of converting wind e nergy into electrical energy, and method for obtaining maximum electrical en ergy (below the cut-off wind speed) (e) Structure : General description, De tailed description (Rotor,Blade, Gear, Generator, Tower, Control unit, Yaw u nit, Rotor brake unit, Grid connection, Receiving and distribution power uni ts, Remote supervisory system, Drive and protection unit, Data collection unit, Foundation, Others [Hub, Main shaft, etc]) Appearance, Dime nsions, Weight, Materials, Frame resistance grade, Terminal structure (f) A ccessories (g) Electrical properties : -Main characteristics (graphs and numerical data) showing : Wind speed in r elation to electrical energy production power, Annual average wind speed in relation to electrical energy production in MWh/year, Annual average wind sp eed in relation to availability, Annual average wind speed in relation to utilization factor (shown in measurement-height of wind speed, distribution of wind speed, and measurement point for the production of electrical energy ) -Insulation strength, Dielectric strength, Surge capability, Emission no ise, Conduction noise, etc. (h) Anti-lightning system. (i) Anti salt-corros ion system (plating and painting for tower and inner units, materials, thick ness, protection life, etc) (j)Environmental conditions : Operating condi tions and characteristics according to ambient temperature and humidity, Ope rating conditions,characteristics and protection against snow and ice. (k) Safety provisions (maintenance, security, fire, etc) (l) Installation cond itions and method of transportation, Construction method, Required transport capacity, Required space for construction, Required space for maintenance, Foundation requirements (normal ground, soft ground) (m) Method of protect ion against survival-wind conditions. (n) Method of protection against eart hquakes. (o) Starting and stopping methods (slight wind, heavy wind). (p) Noise depression method and characteristics. (q) Improvement method and ch aracteristics for reactive power factor. (r) Method and frequency of mainte nance. (s) Supplier for main units and devices. (t) Improvement method for harmonics. (u) Grid connection method and specifications. (v) Method and specifications for the prevention of self-driving. (w) Improvement method an d characteristics for flicker. (x) Data required by electric power companie s for grid connection compatibility (inner impedance [impedance, reactance, resistance, etc], Efficiency-curve, No-load saturable-curve, etc.) (y) Cata logs, brochures, and technical reports, etc. 2)Reference price (itemized and total sum) and terms : The total price should include all materials and cost s for building the wind generator system with grid connection. The itemized price should show, for example, the price of the wind generator, grid connec tion unit, interconnection power unit, receiving distribution power unit, re mote supervisory unit and data-collection unit, etc., and the costs of const ruction, installation, and transportation, etc. If the price would differ ac cording to the area, we request that your proposal include the price for eac h area. Ground conditions include both normal soft ground. For soft ground, 15m stakes are needed. Any additional costs should be shown in detail.,3) S tandard delivery period after an order is placed.,4) Sales record (Japan an d other countries, listed separately),5) Data concerning previous installat ions Lightning strikes, Electrical energy production in MWh/year (Availabili ty, Utilization factor),6) Guidelines and rules for constructing the wind g enerator system,7) Other information (a) Troubleshooting tech-support orga nization(Number of technicians, Skill in troubleshooting, Supported items) (b) Maintenance support organization (Number of technicians, Maintenance ski lls, Supported items) (c) Technical support organization (Number of technic ians, Skill in technical support, Supported items) (d) Other constructive p roposals pertinent to NTT's business (4) Request for Declaration of the In tention of Participating as a Subcontractor: Any suppliers wishing to partic ipate as a subcontractor in the product procurement program of NTT, are requ ested to supply NTT with the information listed below. After preparing a li st of supplied information, NTT will provide the list to suppliers who wish to be provided with it, to those who have responded to the request for suppl y of the information listed and to those who have purchased the PROCUREMENT DOCUMENTATION relating to procurement of the product. NTT, however, will un dertake no responsibilies for any outcomes arising from supply of the list, (i)Name of supplier, (ii)Place of contact (Address, name of the person in ch arge, telephone number, and fascimile number). (5) Deadline of submission o f materials and comments: 3:00 PM, February 24, 1997 (Mail must arrive no l ater than the above date). (6) Language: Japanese or English***** (0023)

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