sheesh - all this over a bit of info that took 5 minutes to find via Google.
TMT Final Environmental Impact Statement
http://dlnr.hawaii.gov/occl/files/2013/0...e-Vol1.pdf
Page 258 or 3-169
"Preliminary design electrical load estimates indicate that the TMT Observatory will operate with a “Peak Demand” (defined as the single highest demand electrical load required during any observatory operating period of time) load of 2.4 MW. However, the average power usage at the TMT Observatory is likely to be similar to the average power usage at the Keck observatory, 350 kW, because the two facilities will be similar in size when you consider both of the Keck domes.
...
Energy consumption at the potential TMT Mid-Level Facility is expected to be minor and would be supplied through the existing HELCO power distribution system at Hale P#333;haku. The 20,000 to 35,000 square foot Headquarters, with 90 up to 116 employees, could consume 60 kW hours per month, based on the average electric bill for the Keck Observatory Headquarters.
...
The electricity use associated with the TMT Observatory, potential TMT Mid-Level Facility, and Headquarters will not have a significant impact on other facilities on the mountain or islandwide. The Project’s average electrical power use represents less than one percent of the generating capacity of HELCO, and is less than the electrical power use associated with a number of different commercial facilities, including resort hotels.
"
So according to the EIS, the TMT's energy costs are estimated to be similar to Keck's, or about $1.1 million a year in 2011 dollars. Concerns over energy use and impacts are also raised in the EIS commentary by Na Kupuna and others.
http://dlnr.hawaii.gov/occl/files/2013/0...e-Vol3.pdf
5 minutes to answer a question or days of bickering; seems like an obvious choice. Oh wait, this is punaweb... carry on