janis mackey frayer, dandong. >>> putting pressure on solar users trying to cut in on the savings that they're enjoying on their electric bills. >>> and just one winner for the mega million jackpot but lotto fever in our country isn't over just yet. >>> it's marketed as a way to save you and your family money on your electric bill but some utility companies are trying to change the rules on solar technology and it could wind up costing you much more than you expect. nbc's lucy kafanov explains. >> reporter: for these homeowners in tucson, arizona, 300 days of sunshine a year made going solar a no-brainer. they shelled out $21,000 hoping to offset the triple digit electric bills that come when temperatures are over 100. >> that's huge. >> that's a massive increase. >> reporter: it's an investment with a long-term payoff. >> ideally, we will pay zero over the year. >> reporter: that's because of something called net metering. when the sun is out, rooftop solar panels make more energy than most homeowners can use and they earn credits for extra power they send to the utility company which

on the map, dandong, far closer to pyongyang than beijing. but the new bridge china built goes nowhere because beijing never built a bridge to meet it. the trade keeps flowing until the lights go off. nbc news, dandong, china. >>> new at 11:00, facebook confirmed it secretly launched a new app in china. a photo sharing app called colorful balloons. it looks similar to moments. facebook name is nowhere to be found in that app. china has banned facebook for years because of the country's censorship laws. >>> with hundreds of thousands of people heading to outside lands, the fog is adding a chill. the music festival celebrating its tenth year and is one of the most popular musical events in california. the headliner playing tonight, metallica. the festival didn't come without controversy. a tribe called quest cancelled their appearance today. they had been forced to move their show because of travel issues. today at the last minute they cancelled entirely. and on social media a lot of people saying i came to see them -- >> there's a lot of talk.

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more than 3/4 of trade of the regime passes here in dandong, china, trucks load and line streets andss to the other side with building supplies, cement, heavy equipment. while severe united nations sanctions could slash a third of the revenue at the choke point, this single lane bridge is business as usual. it is normal to trade with north korea, says this business owner. there is nothing to fear. but these days, tension is running high. the suspicions keep a low profile. as north korea's biggest ally and trading partner, china's pressure is crucial. though sanctions alone have never worked. china's priority always has been stability and maintaining buffer zones. china does not want to fully implement sanctions or cut off trade completely with north korea. >> reporter: in dandong, north korea is more of an attraction. tourists go there to get a glimpse to look at north koreans and at how far china has come. the river separates the two by more than geography. china, the second largest economy, north korea, the most isolated country on earth. at most, there is a half mile between china

imposed sanctions against five chinese companies, including this trading company in dandong. accused of having passed hundreds of millions of dollars illegally through these u.s. banks. experts who track chinese companies who help north korea say, this kind of crackdown is critical. >> we can touch them. there are very few pressure points. and we can make a major impact. >> reporter: as for that house in great neck, it's on the market. mr. sun, who has not been charged with a crime and did not respond to our request for comment, apparently decided the american dream was not for him. cynthia mcfadden, nbc news, new york. >>> still ahead here tonight, a bizarre mystery at sea. an inventor rescued when his private submarine sinks. but where is the woman who was also onboard? it's a twisted tale he's telling, and we'll have it for you. >>> also, thinking of traveling soon? why now is the time to book that plane ticket. hope you can stay with us. >>> we're back now with a case that sounds like it's right out of a mystery novel. investigators are trying to get to the bottom of what

sanctions, which means cutting off a lot of the trade that happens here in the chinese border town of dandongh korea's ability to keep funding its weapons program will likely come at the expense of its citizens, many of whom are already forced to work in other countries. they send their pay worth more than a billion dollars to the regime. the new sanctions won't end that or address t chinese companies and banks that continue to do business with north korea. >> it's good that we have a resolution, but the next step is making sure that all of these areas, all these loopholes, all the areas that have been called out are fixed one by one. >> another big thing these sanctions do not address is the oil that china exports to north korea. it's widely believed if china were to simply cut that off the north korean regime would eventually collapse. china has no interest in seeing that happen because they fear a refugee crisis of the roughly 800-mile-long border it shares with north korea. margaret? >> ben tracy in beijing, thank you. >>> our poll also finds no real change in the president's job rating.

china trump administration has shown willingness to do at least in a small way sanctions on bank of dandongctions dagen that could have been in place that were not put in place, but a lot of those things are more toward the holistic side of things, sanctions take time to take effect. and those effects have to be in place for a while before they become acute enough to where it gets people's attention so we talk a lot about sanctions, there are things that should have been done 10, 15 years ago but we don't react and we don't at least not just in united states but i think it is western culture that we don't react until things get so bad that then you really have to do something but to your point are we ahead of the game here? i think we are ahead of the game, if you just take the rhetoric for what it is don't look for what is happening on the ground. what is happening on the ground is everybody position forces adults in the room chinese americans understand gravity of this situation kim jong-un playing at a game dangerous in rhetoric will he pull the trigger? if he does that is the last event