Estamos na primavera, final de outubro, e ja sentimos na pele o que nos aguarda: o calor escaldante do nosso verao. Terra de contrastes, muitos que nunca estiveram nao acreditam que faca tanto calor nessa terra.Tenho uma briga domestica: minha mulher detesta o inverno. Eu prefiro qualquer coisa que nao seja o nosso verao. Nossos dias de verao sao quentes e abafados. Os entendidos dizem que existe calor e quantidade de calor. Nao entendo muito do assunto, mas posso dizer que prefiro 40 graus no Rio do que 30 aqui no portinho.Nosso calor, como costumo dizer, e amazonico, um calor acompanhado de uma alta umidade do ar. Um calor denso pesado, cansativo. E o pior e que logo, logo, vai ficar pior...Alguem me da uma carona pros polos? Stephan NielsenApr 19, 2012 6:00 am ETApril 19 (Bloomberg) -- Brazil, where solar installations last year were less than 1 percent of those in world leader Germany, is developing policies that may boost rooftop panel sales to $3 billion within 20 years.Homeowners and businesses in Brazil may now trade electricity generated during the day by rooftop solar systems to utilities in exchange for the power they consume at night, under rules announced April 17 by the Brasilia-based power regulator Agencia Nacional de Energia Eletrica.The practice, known as net metering, is widely used in other countries and will make solar energy more practical for consumers, driving up demand, said Luis Otavio Colaferro, managing partner of the Ribeirao Preto, Brazil-based panel distributor Blue Sol Ltda.This market will expand, he said in an interview yesterday. Previously, houses could install panels but only consume power at the time of generation.Blue Sol expects panel sales to increase 50 percent annually as homeowners seek to cut their power bills. Electricity prices in Brazil are double the rates in some U.S. markets and increasing by about 10 percent a year, Colaferro said.$3 Billion MarketBrazil may install as many as 300,000 rooftop photovoltaic devices worth $3 billion by 2030, Nelson Fonseca Leite, president of the Brasilia-based trade group Associacao Brasileira de Distribuidores de Energia Eletrica, said in an interview.Under the net metering rules, power generated by renewable sources -- solar, wind, biomass and hydroelectric systems --will earn credits that utilities are required to accept in exchange for electricity consumed from the grid.The country installed panels with 4 megawatts of capacity last year, mostly in rural areas, compared to about 7,500 megawatts in Germany, the worlds largest solar market last year, Guilherme Araujo, chief executive officer of Sao Paulo- based developer Empresa Brasileira de Energia Solar, said in a telephone interview.Weve got big expectations for the short-term, he said. Net metering is an excellent incentive.Sunshine in Germany may generate as much as 1,050 kilowatt- hours of electricity annually for every kilowatt of installed capacity, Jenny Chase, an analyst with Bloomberg New Energy Finance in Zurich, said in an e-mail. Sunlight that falls on some parts of Brazil, which straddles the equator, may generate more than 1,400 kilowatt-hours from each kilowatt of capacity annually, she said.New ProjectsThe new rules issued by ANEEL also offer